task-120: 大页数据性能回归 + 恢复 similarasin 测试入库

性能回归（SimilarAsinTaskServicePerf500Test，8/8 绿）：
- test_perf_light_200 原以墙钟毫秒比较 light 与 batch（assertTrue
  lightMs < batchMs）。两条路径都跑纯内存 stub，耗时在十几毫秒量级，
  JIT/GC/线程调度抖动远大于真实差值，本机实测 light 14ms / batch 13ms
  直接翻红。改为确定性口径：light 结果明细查询数 == 0（batch ≥ 1）、
  light 总查询数 < batch 总查询数、batch 条目携带任务明细对象而 light
  只有白名单字段；墙钟仅保留单侧上界 1s（N+1 退化会放大到秒级从而失败）。
  连续 3 次独立运行稳定通过。
- 类注释同步移除“已知 flaky，隔离重跑即接受”的说明。

恢复测试入库：
- fa5a59e(task-116) 把 similarasin 测试目录整体从 git 删除，并加了
  .gitignore 规则 *.broken/，磁盘上目录改名 similarasin.broken。
  但包声明仍是 com.nanri.aiimage.modules.similarasin.*，javac 照常编译，
  这 40 个测试文件一直在参与构建、并且是 mvn test 的门禁的一部分——
  等于脱离版本控制却仍在 gate 构建。
- 目录改回 similarasin/（现在与包声明一致），移除 *.broken/ 忽略规则，
  40 个测试文件重新入库。mvn test-compile 退出码 0。

.gitignore

@@ -118,7 +118,6 @@ backend-java/docs/plans/
 backend-java/docs/*plan*.md
 backend-java/docs/specs/
 backend-java/docs/*audit*.md
-*.broken/
 
 # ===== 进度/规划工具（本地使用，不入库）=====
 check_progress.py

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/controller/SimilarAsinTaskLightControllerTest.java

@@ -0,0 +1,155 @@
+package com.nanri.aiimage.modules.similarasin.controller;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinTaskLightRequest;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinTaskLightBatchVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinTaskLightVo;
+import com.nanri.aiimage.modules.similarasin.service.SimilarAsinTaskService;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import java.util.List;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * 任务 109：progress/light 轻量接口（similarasin 首个）。
+ * 新端点 POST /api/similar-asin/tasks/progress/light 只返回轻量字段（taskId/status/statusCode?/fileStatus?/fileReady?/updatedAt）；
+ * 旧 progress/batch 端点原样保留可用；不存在的任务进 missingTaskIds。
+ */
+class SimilarAsinTaskLightControllerTest {
+
+    private static final String LIGHT_URL = "/api/similar-asin/tasks/progress/light";
+
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
+    private SimilarAsinTaskService service;
+    private MockMvc mockMvc;
+
+    private SimilarAsinTaskLightBatchVo lightBatch(SimilarAsinTaskLightVo... items) {
+        SimilarAsinTaskLightBatchVo vo = new SimilarAsinTaskLightBatchVo();
+        vo.getItems().addAll(List.of(items));
+        return vo;
+    }
+
+    private static SimilarAsinTaskLightVo lightItem(Long taskId, String status, String fileStatus, Boolean fileReady, String updatedAt) {
+        SimilarAsinTaskLightVo vo = new SimilarAsinTaskLightVo();
+        vo.setTaskId(taskId);
+        vo.setStatus(status);
+        vo.setFileStatus(fileStatus);
+        vo.setFileReady(fileReady);
+        vo.setUpdatedAt(updatedAt);
+        return vo;
+    }
+
+    private void setUpWith(SimilarAsinTaskLightBatchVo response) throws Exception {
+        service = mock(SimilarAsinTaskService.class);
+        when(service.progressLight(any())).thenReturn(response);
+        mockMvc = MockMvcBuilders.standaloneSetup(new SimilarAsinController(service)).build();
+    }
+
+    @Test
+    void lightReturnsLightFields() throws Exception {
+        setUpWith(lightBatch(lightItem(3938L, "RUNNING", "RUNNING", false, "2026-04-26T10:05:00")));
+        mockMvc.perform(post(LIGHT_URL)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(new SimilarAsinTaskLightRequest(List.of(3938L)))))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.success").value(true))
+                .andExpect(jsonPath("$.data.items[0].taskId").value(3938))
+                .andExpect(jsonPath("$.data.items[0].status").value("RUNNING"))
+                .andExpect(jsonPath("$.data.items[0].fileStatus").value("RUNNING"))
+                .andExpect(jsonPath("$.data.items[0].fileReady").value(false))
+                .andExpect(jsonPath("$.data.items[0].updatedAt").value("2026-04-26T10:05:00"));
+    }
+
+    @Test
+    void lightMissingTask() throws Exception {
+        setUpWith(lightBatch(lightItem(1L, "SUCCESS", "SUCCESS", true, "2026-04-26T10:10:00")));
+        mockMvc.perform(post(LIGHT_URL)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(new SimilarAsinTaskLightRequest(List.of(1L)))))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.success").value(true))
+                .andExpect(jsonPath("$.data.items[0].taskId").value(1));
+        verify(service).progressLight(any());
+    }
+
+    @Test
+    void lightEmptyIds() throws Exception {
+        setUpWith(new SimilarAsinTaskLightBatchVo());
+        mockMvc.perform(post(LIGHT_URL)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(new SimilarAsinTaskLightRequest(List.of()))))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.items").isEmpty())
+                .andExpect(jsonPath("$.data.missingTaskIds").isEmpty());
+    }
+
+    @Test
+    void lightDedupIds() throws Exception {
+        setUpWith(lightBatch(lightItem(7L, "PENDING", null, false, "2026-04-26T10:00:00")));
+        mockMvc.perform(post(LIGHT_URL)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(new SimilarAsinTaskLightRequest(List.of(7L, 7L, 7L)))))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.items.length()").value(1));
+    }
+
+    @Test
+    void lightOldEndpointUntouched() throws Exception {
+        com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinTaskBatchRequest request = new com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinTaskBatchRequest();
+        request.setTaskIds(List.of(1L));
+        service = mock(SimilarAsinTaskService.class);
+        when(service.progressBatch(any())).thenReturn(new com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinTaskBatchVo());
+        mockMvc = MockMvcBuilders.standaloneSetup(new SimilarAsinController(service)).build();
+        mockMvc.perform(post("/api/similar-asin/tasks/progress/batch")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(request)))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.success").value(true));
+        verify(service).progressBatch(any());
+    }
+
+    @Test
+    void lightStatusMapping() throws Exception {
+        setUpWith(lightBatch(lightItem(2L, "SUCCESS", "SUCCESS", true, "2026-04-26T10:11:00")));
+        mockMvc.perform(post(LIGHT_URL)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(new SimilarAsinTaskLightRequest(List.of(2L)))))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.items[0].status").value("SUCCESS"));
+    }
+
+    @Test
+    void lightFileFields() throws Exception {
+        setUpWith(lightBatch(lightItem(3L, "RUNNING", "SUCCESS", true, "2026-04-26T10:12:00")));
+        mockMvc.perform(post(LIGHT_URL)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(new SimilarAsinTaskLightRequest(List.of(3L)))))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.items[0].fileStatus").value("SUCCESS"))
+                .andExpect(jsonPath("$.data.items[0].fileReady").value(true));
+    }
+
+    @Test
+    void lightUnknownId() throws Exception {
+        SimilarAsinTaskLightBatchVo vo = new SimilarAsinTaskLightBatchVo();
+        vo.getMissingTaskIds().add(99999L);
+        setUpWith(vo);
+        mockMvc.perform(post(LIGHT_URL)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(new SimilarAsinTaskLightRequest(List.of(99999L)))))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.items").isEmpty())
+                .andExpect(jsonPath("$.data.missingTaskIds[0]").value(99999));
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/model/vo/SimilarAsinTaskLightWhitelistTest.java

@@ -0,0 +1,127 @@
+package com.nanri.aiimage.modules.similarasin.model.vo;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.api.ApiResponse;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Set;
+import java.util.TreeSet;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * 任务 110：progress/light 字段白名单。
+ * 响应仅含白名单字段（taskId/status/statusCode/fileStatus/fileReady/updatedAt）；
+ * 不含 items 明细/payload/result 内容；序列化后键集合精确匹配；响应体小（<1KB）。
+ */
+class SimilarAsinTaskLightWhitelistTest {
+
+    private static final Set<String> WHITELIST = new TreeSet<>(Set.of(
+            "taskId", "status", "statusCode", "fileStatus", "fileError", "fileReady", "updatedAt"));
+
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
+    private SimilarAsinTaskLightVo fullItem() {
+        SimilarAsinTaskLightVo vo = new SimilarAsinTaskLightVo();
+        vo.setTaskId(3938L);
+        vo.setStatus("RUNNING");
+        vo.setStatusCode(null);
+        vo.setFileStatus("RUNNING");
+        vo.setFileReady(false);
+        vo.setUpdatedAt("2026-04-26T10:05:00");
+        return vo;
+    }
+
+    private Set<String> keysOf(SimilarAsinTaskLightVo vo) throws Exception {
+        JsonNode node = objectMapper.readTree(objectMapper.writeValueAsBytes(vo));
+        Set<String> keys = new TreeSet<>();
+        node.fieldNames().forEachRemaining(keys::add);
+        return keys;
+    }
+
+    @Test
+    void whitelistExactKeys() throws Exception {
+        assertEquals(WHITELIST, keysOf(fullItem()), "序列化键集合与白名单精确一致");
+    }
+
+    @Test
+    void whitelistNoItemsArray() throws Exception {
+        JsonNode node = objectMapper.readTree(objectMapper.writeValueAsBytes(fullItem()));
+        assertFalse(node.has("items"), "不含明细数组");
+        assertFalse(node.has("itemCount"));
+    }
+
+    @Test
+    void whitelistNoPayload() throws Exception {
+        JsonNode node = objectMapper.readTree(objectMapper.writeValueAsBytes(fullItem()));
+        assertFalse(node.has("payload"), "不含 payload 字段");
+        assertFalse(node.has("requestJson"));
+        assertFalse(node.has("resultJson"));
+    }
+
+    @Test
+    void whitelistNoResultContent() throws Exception {
+        JsonNode node = objectMapper.readTree(objectMapper.writeValueAsBytes(fullItem()));
+        assertFalse(node.has("resultId"), "不含 resultId");
+        assertFalse(node.has("downloadUrl"), "不含下载链接");
+        assertFalse(node.has("rowCount"), "不含行数明细");
+        assertFalse(node.has("success"), "不含成功标志明细");
+    }
+
+    @Test
+    void whitelistFilePhasePresent() throws Exception {
+        SimilarAsinTaskLightVo vo = fullItem();
+        vo.setFileStatus("SUCCESS");
+        vo.setFileReady(true);
+        JsonNode node = objectMapper.readTree(objectMapper.writeValueAsBytes(vo));
+        assertEquals("SUCCESS", node.get("fileStatus").asText());
+        assertTrue(node.get("fileReady").asBoolean());
+    }
+
+    @Test
+    void whitelistNullValuesAllowed() throws Exception {
+        SimilarAsinTaskLightVo vo = new SimilarAsinTaskLightVo();
+        vo.setTaskId(1L);
+        JsonNode node = objectMapper.readTree(objectMapper.writeValueAsBytes(vo));
+        assertTrue(node.has("statusCode"), "statusCode 键存在（null 值允许）");
+        assertTrue(node.get("statusCode").isNull());
+        assertEquals(WHITELIST, keysOf(vo), "null 字段仍在白名单键集合内");
+    }
+
+    @Test
+    void whitelistResponseSizeSmall() throws Exception {
+        SimilarAsinTaskLightBatchVo batch = new SimilarAsinTaskLightBatchVo();
+        batch.getItems().add(fullItem());
+        byte[] bytes = objectMapper.writeValueAsBytes(ApiResponse.success(batch));
+        assertTrue(bytes.length < 1024, "单条 light 响应 <1KB，实际 " + bytes.length + "B");
+    }
+
+    @Test
+    void whitelistExtraKeysRejected() throws Exception {
+        // 回归门禁：白名单键集合与文档一致（新增键必须先更新本测试与 spec）
+        assertEquals(List.of("fileError", "fileReady", "fileStatus", "status", "statusCode", "taskId", "updatedAt"),
+                new java.util.ArrayList<>(WHITELIST));
+    }
+
+    @Test
+    void whitelistDocumentedInSpec() throws Exception {
+        // 与 spec 06 §2 对齐：taskId/status/statusCode?/fileStatus?/fileError?/fileReady?/updatedAt
+        assertTrue(WHITELIST.containsAll(Set.of("taskId", "status", "updatedAt")));
+        assertTrue(WHITELIST.containsAll(Set.of("statusCode", "fileStatus", "fileReady", "fileError")));
+    }
+
+    @Test
+    void whitelistBatchHasOnlyItemsAndMissing() throws Exception {
+        SimilarAsinTaskLightBatchVo batch = new SimilarAsinTaskLightBatchVo();
+        batch.getItems().add(fullItem());
+        batch.getMissingTaskIds().add(999L);
+        JsonNode node = objectMapper.readTree(objectMapper.writeValueAsBytes(batch));
+        Set<String> keys = new TreeSet<>();
+        node.fieldNames().forEachRemaining(keys::add);
+        assertEquals(new TreeSet<>(Set.of("items", "missingTaskIds")), keys, "批量 VO 只含 items/missingTaskIds");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/LlmGatewayTlsProbe.java

@@ -0,0 +1,85 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import javax.net.ssl.SNIHostName;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLParameters;
+import javax.net.ssl.SSLSocket;
+import javax.net.ssl.SSLSocketFactory;
+import java.net.InetAddress;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.time.Duration;
+import java.util.List;
+
+public class LlmGatewayTlsProbe {
+
+    public static void main(String[] args) throws Exception {
+        String host = "ai.t8star.org";
+        String apiKey = args[0];
+
+        System.out.println("[probe] java=" + System.getProperty("java.version")
+                + " tls=" + System.getProperty("java.vm.name"));
+        for (InetAddress a : InetAddress.getAllByName(host)) {
+            System.out.println("[probe] dns " + a);
+        }
+
+        rawHandshake(host, null, "default");
+        rawHandshake(host, "TLSv1.2", "tls12-only");
+
+        httpClientCall(host, apiKey, null, "jdk-http-default");
+        httpClientCall(host, apiKey, "TLSv1.2", "jdk-http-tls12");
+    }
+
+    private static void rawHandshake(String host, String protocol, String label) throws Exception {
+        SSLSocketFactory factory = (SSLSocketFactory) SSLSocketFactory.getDefault();
+        try (SSLSocket socket = (SSLSocket) factory.createSocket(host, 443)) {
+            socket.setSoTimeout(15000);
+            SSLParameters params = socket.getSSLParameters();
+            if (protocol != null) {
+                params.setProtocols(new String[]{protocol});
+            }
+            params.setServerNames(List.of(new SNIHostName(host)));
+            socket.setSSLParameters(params);
+            socket.startHandshake();
+            System.out.println("[probe] raw[" + label + "] OK proto=" + socket.getSession().getProtocol()
+                    + " cipher=" + socket.getSession().getCipherSuite());
+        } catch (Exception ex) {
+            System.out.println("[probe] raw[" + label + "] FAIL " + ex.getClass().getSimpleName() + ": " + ex.getMessage());
+        }
+    }
+
+    private static void httpClientCall(String host, String apiKey, String protocol, String label) throws Exception {
+        HttpClient.Builder builder = HttpClient.newBuilder()
+                .connectTimeout(Duration.ofSeconds(10))
+                .version(HttpClient.Version.HTTP_1_1);
+        if (protocol != null) {
+            SSLContext context = SSLContext.getInstance("TLS");
+            context.init(null, null, null);
+            builder.sslContext(context);
+        }
+        HttpClient client = builder.build();
+        try {
+            String body = "{\"model\":\"gemini-3.5-flash-lite\",\"messages\":[{\"role\":\"user\",\"content\":\"ping\"}],\"max_tokens\":10}";
+            HttpRequest request = HttpRequest.newBuilder()
+                    .uri(URI.create("https://" + host + "/v1/chat/completions"))
+                    .timeout(Duration.ofSeconds(30))
+                    .header("Authorization", "Bearer " + apiKey)
+                    .header("Content-Type", "application/json")
+                    .POST(HttpRequest.BodyPublishers.ofString(body))
+                    .build();
+            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+            String text = response.body();
+            System.out.println("[probe] http[" + label + "] status=" + response.statusCode()
+                    + " body=" + text.substring(0, Math.min(160, text.length())));
+        } catch (Exception ex) {
+            System.out.println("[probe] http[" + label + "] FAIL " + ex.getClass().getSimpleName() + ": " + ex.getMessage());
+            Throwable cause = ex;
+            while (cause.getCause() != null) {
+                cause = cause.getCause();
+                System.out.println("[probe]   cause " + cause.getClass().getSimpleName() + ": " + cause.getMessage());
+            }
+        }
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinImagePrefetchServiceAsyncTouchTest.java

@@ -0,0 +1,226 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.task.mapper.TaskImageCacheMapper;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 15：图片缓存访问时间更新改为异步批量刷新，减少逐图 UPDATE。
+ * lookup 命中不再同步 touchLastUsed，而是进入内存 touch 缓冲（按 url_hash 去重），
+ * 由定时任务/阈值触发 flushPendingTouches 批量 touchLastUsedBatch 刷新；
+ * 缓冲有大小上限，超限立即刷新，不会无界增长；失败 best-effort 吞掉。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinImagePrefetchServiceAsyncTouchTest {
+
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private TaskImageCacheMapper taskImageCacheMapper;
+    @Mock private SimilarAsinProperties properties;
+
+    @InjectMocks private SimilarAsinImagePrefetchService service;
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isImageDbCacheEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheTouchFlushThreshold()).thenReturn(1000);
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdown();
+    }
+
+    private static String sha256Hex(String value) throws Exception {
+        java.security.MessageDigest md = java.security.MessageDigest.getInstance("SHA-256");
+        byte[] digest = md.digest(value.getBytes(java.nio.charset.StandardCharsets.UTF_8));
+        StringBuilder sb = new StringBuilder(digest.length * 2);
+        for (byte b : digest) {
+            sb.append(String.format("%02x", b & 0xFF));
+        }
+        return sb.toString();
+    }
+
+    private void stubHit(String url, byte[] bytes) throws Exception {
+        when(taskImageCacheMapper.selectBytesByUrlHash(sha256Hex(url))).thenReturn(bytes);
+    }
+
+    @Test
+    void test_task_015_image_cache_normal_default_path() throws Exception {
+        // 正常输入：命中不立即写 DB，进入缓冲；flush 后批量 touch 一次。
+        String url = "https://img.example.com/hit.jpg";
+        String hash = sha256Hex(url);
+        byte[] bytes = new byte[]{1, 2, 3};
+        stubHit(url, bytes);
+
+        byte[] result = service.lookup(url);
+        assertEquals(bytes, result, "命中必须返回缓存字节");
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+        verify(taskImageCacheMapper, never()).touchLastUsedBatch(any());
+
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(List.of(hash));
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+
+    @Test
+    void test_task_015_image_cache_normal_multiple_items() throws Exception {
+        // 批量场景：多次命中进入同一缓冲，flush 合并为一次批量 touch，覆盖全部命中。
+        List<String> urls = List.of("https://img.example.com/a.jpg", "https://img.example.com/b.jpg",
+                "https://img.example.com/c.jpg");
+        Set<String> hashes = new HashSet<>();
+        for (int i = 0; i < urls.size(); i++) {
+            hashes.add(sha256Hex(urls.get(i)));
+            stubHit(urls.get(i), new byte[]{(byte) (i + 1)});
+        }
+        for (String url : urls) {
+            assertNotNull(service.lookup(url), "命中返回字节");
+        }
+        verify(taskImageCacheMapper, never()).touchLastUsedBatch(any());
+
+        service.flushPendingTouches();
+        org.mockito.ArgumentCaptor<List<String>> captor = org.mockito.ArgumentCaptor.forClass(List.class);
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(captor.capture());
+        assertEquals(hashes, new HashSet<>(captor.getValue()), "一次批量 touch 覆盖全部命中 hash");
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+
+    @Test
+    void test_task_015_image_cache_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复执行同一输入：同一 url 多次命中只 touch 一次；重复 flush 无多余请求。
+        String url = "https://img.example.com/same.jpg";
+        String hash = sha256Hex(url);
+        stubHit(url, new byte[]{5});
+        when(taskImageCacheMapper.selectBytesByUrlHash(hash)).thenReturn(new byte[]{5});
+
+        service.lookup(url);
+        service.lookup(url);
+        service.lookup(url);
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(List.of(hash));
+
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(any());
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+
+    @Test
+    void test_task_015_image_cache_boundary_empty_input() throws Exception {
+        // 空输入：null/空白 url 不进入缓冲；flush 空缓冲不产生任何数据库访问。
+        assertNull(service.lookup(null));
+        assertNull(service.lookup(""));
+        assertNull(service.lookup("   "));
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, never()).touchLastUsedBatch(any());
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+        verify(taskImageCacheMapper, never()).selectBytesByUrlHash(anyString());
+    }
+
+    @Test
+    void test_task_015_image_cache_boundary_single_item() throws Exception {
+        // 单条命中：flush 后单元素批量 touch，不依赖批量路径。
+        String url = "https://img.example.com/single.jpg";
+        String hash = sha256Hex(url);
+        stubHit(url, new byte[]{7});
+
+        assertNotNull(service.lookup(url));
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(List.of(hash));
+    }
+
+    @Test
+    void test_task_015_image_cache_boundary_limit_and_overflow() throws Exception {
+        // 缓冲达到阈值立即刷新，不无界增长；刷新后继续累积。
+        lenient().when(properties.getImageCacheTouchFlushThreshold()).thenReturn(3);
+        List<String> urls = List.of("https://img.example.com/o1.jpg", "https://img.example.com/o2.jpg",
+                "https://img.example.com/o3.jpg", "https://img.example.com/o4.jpg",
+                "https://img.example.com/o5.jpg");
+        for (String url : urls) {
+            stubHit(url, new byte[]{1});
+        }
+        org.mockito.ArgumentCaptor<List<String>> captor = org.mockito.ArgumentCaptor.forClass(List.class);
+
+        for (int i = 0; i < 3; i++) {
+            service.lookup(urls.get(i));
+        }
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(captor.capture());
+        assertEquals(3, captor.getValue().size(), "第 3 条命中触发阈值立即刷新 3 条");
+
+        service.lookup(urls.get(3));
+        service.lookup(urls.get(4));
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(any());
+
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, times(2)).touchLastUsedBatch(captor.capture());
+        assertEquals(2, captor.getValue().size(), "剩余 2 条在 flush 时刷新，缓冲不残留、不无界增长");
+    }
+
+    @Test
+    void test_task_015_image_cache_invalid_input_rejected() {
+        // 非法输入：db cache 关闭时 lookup 直接返回 null，不进入缓冲、不访问数据库。
+        lenient().when(properties.isImageDbCacheEnabled()).thenReturn(false);
+        assertNull(service.lookup("https://img.example.com/a.jpg"));
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, never()).selectBytesByUrlHash(anyString());
+        verify(taskImageCacheMapper, never()).touchLastUsedBatch(any());
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+
+    @Test
+    void test_task_015_image_cache_dependency_failure_releases_resources() throws Exception {
+        // 依赖失败：批量 touch 抛异常时吞掉不阻塞 lookup、缓冲已排空无残留；
+        // 恢复后重新入队 flush 成功。
+        String url = "https://img.example.com/fail.jpg";
+        String hash = sha256Hex(url);
+        stubHit(url, new byte[]{3});
+        AtomicInteger failures = new AtomicInteger(0);
+        List<String> capturedArgs = new java.util.ArrayList<>();
+        doAnswer(invocation -> {
+            @SuppressWarnings("unchecked")
+            List<String> arg = (List<String>) invocation.getArgument(0);
+            capturedArgs.addAll(arg);
+            if (failures.getAndIncrement() == 0) {
+                throw new IllegalStateException("db down");
+            }
+            return 0;
+        }).when(taskImageCacheMapper).touchLastUsedBatch(any());
+
+        assertNotNull(service.lookup(url), "touch 失败不阻断 lookup 返回缓存字节");
+        assertThrows(Exception.class, () -> service.flushPendingTouches(), "首次 flush 抛错（由调用方吞掉）");
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(any());
+
+        assertNotNull(service.lookup(url), "失败后再次命中重新入队");
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, times(2)).touchLastUsedBatch(any());
+        assertEquals(List.of(hash, hash), capturedArgs, "两次 touch 都覆盖命中 hash，失败后恢复成功");
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+
+    private static void assertNull(Object value) {
+        org.junit.jupiter.api.Assertions.assertNull(value);
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinImagePrefetchServiceBatchTest.java

@@ -0,0 +1,297 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.task.mapper.TaskImageCacheMapper;
+import com.nanri.aiimage.modules.task.model.entity.TaskImageCacheEntity;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 14：图片 DB cache 改为批量读取缩略图，并只更新实际命中的 last_used_at。
+ * 批量 lookup 入口（lookupBatch）一次 IN 查询返回命中字节 Map；
+ * last_used_at 只对实际命中的 url_hash 更新（touch 集合 = 命中集合），
+ * 未命中 url 不产生任何 touch/insert。单 URL 旧入口 lookup 语义保持兼容。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinImagePrefetchServiceBatchTest {
+
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private TaskImageCacheMapper taskImageCacheMapper;
+    @Mock private SimilarAsinProperties properties;
+
+    @InjectMocks private SimilarAsinImagePrefetchService service;
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isImageDbCacheEnabled()).thenReturn(true);
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdown();
+    }
+
+    private static String sha256Hex(String value) throws Exception {
+        java.security.MessageDigest md = java.security.MessageDigest.getInstance("SHA-256");
+        byte[] digest = md.digest(value.getBytes(java.nio.charset.StandardCharsets.UTF_8));
+        StringBuilder sb = new StringBuilder(digest.length * 2);
+        for (byte b : digest) {
+            sb.append(String.format("%02x", b & 0xFF));
+        }
+        return sb.toString();
+    }
+
+    /** stub 批量命中读取：只对 hits 集合内的 hash 返回字节。 */
+    private void stubBatchRead(List<String> hits, Map<String, byte[]> bytesByHash) {
+        when(taskImageCacheMapper.selectBytesByUrlHashes(any())).thenAnswer(invocation -> {
+            List<String> hashes = invocation.getArgument(0);
+            List<TaskImageCacheEntity> rows = new ArrayList<>();
+            for (String hash : hashes) {
+                if (hits.contains(hash)) {
+                    TaskImageCacheEntity row = new TaskImageCacheEntity();
+                    row.setUrlHash(hash);
+                    row.setImageBytes(bytesByHash.get(hash));
+                    rows.add(row);
+                }
+            }
+            return rows;
+        });
+    }
+
+    /** 调用批量入口，按 url 顺序返回字节（未命中为 null）。 */
+    @SuppressWarnings("unchecked")
+    private static List<byte[]> invokeLookupBatch(SimilarAsinImagePrefetchService svc, List<String> urls) throws Exception {
+        Method m = SimilarAsinImagePrefetchService.class.getDeclaredMethod("lookupBatch", List.class);
+        m.setAccessible(true);
+        return (List<byte[]>) m.invoke(svc, urls);
+    }
+
+    @Test
+    void test_task_014_image_normal_default_path() throws Exception {
+        // 正常输入：命中与未命中混排，批量读回命中字节，touch 只覆盖实际命中。
+        List<String> urls = List.of("https://img.example.com/a.jpg", "https://img.example.com/b.jpg");
+        List<String> hits = List.of(sha256Hex(urls.get(0)));
+        byte[] bytesA = new byte[]{1, 2, 3};
+        stubBatchRead(hits, Map.of(sha256Hex(urls.get(0)), bytesA));
+
+        List<byte[]> result = invokeLookupBatch(service, urls);
+
+        assertEquals(2, result.size(), "批量入口必须按输入顺序返回");
+        assertEquals(bytesA, result.get(0), "命中行返回缓存字节");
+        assertNull(result.get(1), "未命中行返回 null，不虚构缓存内容");
+        verify(taskImageCacheMapper, times(1)).selectBytesByUrlHashes(any());
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(List.of(sha256Hex(urls.get(0))));
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+        verify(taskImageCacheMapper, never()).insert(any(TaskImageCacheEntity.class));
+    }
+
+    @Test
+    void test_task_014_image_normal_multiple_items() throws Exception {
+        // 批量场景：全命中多 url，一次 IN 查询返回全部字节，touch 覆盖全部命中。
+        List<String> urls = List.of("https://img.example.com/a.jpg", "https://img.example.com/b.jpg",
+                "https://img.example.com/c.jpg");
+        List<String> hits = new ArrayList<>();
+        Map<String, byte[]> bytesByHash = new java.util.LinkedHashMap<>();
+        for (int i = 0; i < urls.size(); i++) {
+            hits.add(sha256Hex(urls.get(i)));
+            bytesByHash.put(hits.get(i), new byte[]{(byte) (i + 1)});
+        }
+        stubBatchRead(hits, bytesByHash);
+
+        List<byte[]> result = invokeLookupBatch(service, urls);
+
+        assertEquals(3, result.size());
+        for (int i = 0; i < urls.size(); i++) {
+            assertEquals(bytesByHash.get(sha256Hex(urls.get(i))), result.get(i), "顺序稳定、字节不丢失");
+        }
+        verify(taskImageCacheMapper, times(1)).selectBytesByUrlHashes(any());
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(new ArrayList<>(hits));
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+
+    @Test
+    void test_task_014_image_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复执行同一输入：每次行为一致，不产生重复请求/重复 touch。
+        List<String> urls = List.of("https://img.example.com/a.jpg");
+        String hash = sha256Hex(urls.get(0));
+        stubBatchRead(List.of(hash), Map.of(hash, new byte[]{9}));
+
+        invokeLookupBatch(service, urls);
+        invokeLookupBatch(service, urls);
+
+        verify(taskImageCacheMapper, times(2)).selectBytesByUrlHashes(any());
+        verify(taskImageCacheMapper, times(2)).touchLastUsedBatch(List.of(hash));
+        verify(taskImageCacheMapper, never()).insert(any(TaskImageCacheEntity.class));
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+
+    @Test
+    void test_task_014_image_boundary_empty_input() throws Exception {
+        // 空输入：null/空列表安全返回空结果，不产生任何数据库访问。
+        List<byte[]> nullResult = invokeLookupBatch(service, null);
+        assertNotNull(nullResult);
+        assertTrue(nullResult.isEmpty());
+
+        List<byte[]> emptyResult = invokeLookupBatch(service, List.of());
+        assertNotNull(emptyResult);
+        assertTrue(emptyResult.isEmpty());
+
+        verify(taskImageCacheMapper, never()).selectBytesByUrlHashes(any());
+        verify(taskImageCacheMapper, never()).touchLastUsedBatch(any());
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+
+    @Test
+    void test_task_014_image_boundary_single_item() throws Exception {
+        // 单 url：不依赖批量路径，命中时单次查询 + 单次 touch。
+        String url = "https://img.example.com/single.jpg";
+        String hash = sha256Hex(url);
+        stubBatchRead(List.of(hash), Map.of(hash, new byte[]{7}));
+
+        List<byte[]> result = invokeLookupBatch(service, List.of(url));
+
+        assertEquals(1, result.size());
+        assertEquals(7, result.get(0)[0]);
+        verify(taskImageCacheMapper, times(1)).selectBytesByUrlHashes(any());
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(List.of(hash));
+    }
+
+    @Test
+    void test_task_014_image_boundary_limit_and_overflow() throws Exception {
+        // 大批量（超过单批上限 500）：分片查询，命中 touch 只覆盖命中集合。
+        List<String> urls = new ArrayList<>();
+        for (int i = 0; i < 1200; i++) {
+            urls.add("https://img.example.com/overflow-" + i + ".jpg");
+        }
+        Map<String, byte[]> bytesByHash = new java.util.LinkedHashMap<>();
+        List<String> hits = new ArrayList<>();
+        for (int i = 0; i < 1200; i += 2) {
+            String hash = sha256Hex(urls.get(i));
+            hits.add(hash);
+            bytesByHash.put(hash, new byte[]{(byte) (i % 100)});
+        }
+        stubBatchRead(hits, bytesByHash);
+
+        List<byte[]> result = invokeLookupBatch(service, urls);
+
+        assertEquals(1200, result.size(), "超大批量结果不丢失、顺序稳定");
+        int hitCount = 0;
+        for (int i = 0; i < 1200; i++) {
+            if (i % 2 == 0) {
+                assertNotNull(result.get(i), "偶数下标命中必须返回字节");
+                hitCount++;
+            } else {
+                assertNull(result.get(i), "奇数下标未命中返回 null");
+            }
+        }
+        assertEquals(600, hitCount);
+        verify(taskImageCacheMapper, times(3)).selectBytesByUrlHashes(any());
+        // touch 按单批 500 分片：600 命中 → 2 次 touch 调用，且只覆盖命中集合。
+        var captor = org.mockito.ArgumentCaptor.forClass(List.class);
+        verify(taskImageCacheMapper, times(2)).touchLastUsedBatch(captor.capture());
+        List<List<String>> touchCalls = new ArrayList<>();
+        for (Object call : captor.getAllValues()) {
+            @SuppressWarnings("unchecked")
+            List<String> casted = (List<String>) call;
+            touchCalls.add(casted);
+        }
+        assertEquals(2, touchCalls.size());
+        assertEquals(500, touchCalls.get(0).size(), "第一批 touch 500 个命中");
+        assertEquals(100, touchCalls.get(1).size(), "第二批 touch 剩余 100 个命中");
+        assertEquals(hits.subList(0, 500), touchCalls.get(0), "touch 只覆盖实际命中集合");
+        assertEquals(hits.subList(500, 600), touchCalls.get(1));
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+
+    @Test
+    void test_task_014_image_invalid_input_rejected() throws Exception {
+        // 非法输入：db cache 关闭时批量入口直接返回空，不访问数据库。
+        lenient().when(properties.isImageDbCacheEnabled()).thenReturn(false);
+        List<String> urls = List.of("https://img.example.com/a.jpg");
+        List<byte[]> result = invokeLookupBatch(service, urls);
+        assertNotNull(result);
+        assertTrue(result.isEmpty(), "db cache 关闭时必须直接返回空结果");
+        verify(taskImageCacheMapper, never()).selectBytesByUrlHashes(any());
+        verify(taskImageCacheMapper, never()).touchLastUsedBatch(any());
+    }
+
+    @Test
+    void test_task_014_image_dependency_failure_releases_resources() throws Exception {
+        // 依赖失败：查询抛异常时批量入口返回空结果、无任何 touch/insert 残留；
+        // 恢复后重试成功。
+        List<String> urls = List.of("https://img.example.com/a.jpg");
+        String hash = sha256Hex(urls.get(0));
+        AtomicInteger callCount = new AtomicInteger(0);
+        doAnswer(invocation -> {
+            if (callCount.getAndIncrement() == 0) {
+                throw new IllegalStateException("db down");
+            }
+            TaskImageCacheEntity row = new TaskImageCacheEntity();
+            row.setUrlHash(hash);
+            row.setImageBytes(new byte[]{5});
+            return List.of(row);
+        }).when(taskImageCacheMapper).selectBytesByUrlHashes(any());
+
+        List<byte[]> failed = invokeLookupBatch(service, urls);
+        assertNotNull(failed);
+        assertTrue(failed.isEmpty(), "查询失败必须返回空结果而不是抛错阻断组装");
+        verify(taskImageCacheMapper, never()).touchLastUsedBatch(any());
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+        verify(taskImageCacheMapper, never()).insert(any(TaskImageCacheEntity.class));
+
+        List<byte[]> recovered = invokeLookupBatch(service, urls);
+        assertEquals(1, recovered.size());
+        assertEquals(5, recovered.get(0)[0], "依赖恢复后重试成功");
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(List.of(hash));
+    }
+
+    @Test
+    void test_task_014_image_normal_single_lookup_legacy_compat() throws Exception {
+        // 兼容性：单 URL 旧入口 lookup 保持返回字节语义；Task 15 起 touch 改为
+        // 异步批量缓冲，flush 后批量 touch 一次，命中才入缓冲。
+        String url = "https://img.example.com/legacy.jpg";
+        String hash = sha256Hex(url);
+        byte[] bytes = new byte[]{6};
+        when(taskImageCacheMapper.selectBytesByUrlHash(hash)).thenReturn(bytes);
+
+        byte[] result = service.lookup(url);
+        assertEquals(bytes, result, "lookup 命中必须返回缓存字节");
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(List.of(hash));
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+
+        assertNull(service.lookup("https://img.example.com/missing.jpg"), "未命中返回 null");
+        service.flushPendingTouches();
+        verify(taskImageCacheMapper, times(1)).touchLastUsedBatch(any());
+        verify(taskImageCacheMapper, never()).touchLastUsed(anyString());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinLlmLocalVerify.java

@@ -0,0 +1,167 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.config.OssProperties;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.productcategory.mapper.ProductCategoryMapper;
+import com.nanri.aiimage.modules.productcategory.service.ProductCategoryService;
+import com.nanri.aiimage.modules.similarasin.client.SimilarAsinLlmClient;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinResultRowDto;
+import com.nanri.aiimage.modules.similarasin.util.PuzzleImageMerger;
+import org.mockito.Mockito;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 本地验证入口：用生产真实批次数据 + 生产 LLM 网关跑 SimilarAsinLlmService 完整链路。
+ * 用法：mvn compile test-compile 后执行
+ * java -cp target/classes;target/test-classes;$(cat cp.txt) com.nanri.aiimage.modules.similarasin.service.SimilarAsinLlmLocalVerify <data.json> <apiKey> [imgSwitch] [categorySwitch]
+ */
+public class SimilarAsinLlmLocalVerify {
+
+    public static void main(String[] args) throws Exception {
+        System.setOut(new java.io.PrintStream(new java.io.FileOutputStream(java.io.FileDescriptor.out), true, "UTF-8"));
+        System.setErr(new java.io.PrintStream(new java.io.FileOutputStream(java.io.FileDescriptor.err), true, "UTF-8"));
+        if (args.length < 2) {
+            System.err.println("usage: SimilarAsinLlmLocalVerify <data.json> <apiKey> [imgSwitch] [categorySwitch]");
+            System.exit(1);
+        }
+        String dataFile = args[0];
+        String apiKey = args[1];
+        boolean imgSwitch = args.length > 2 && Boolean.parseBoolean(args[2]);
+        boolean categorySwitch = args.length > 3 && Boolean.parseBoolean(args[3]);
+
+        ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.configure(com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+        JsonNode root = objectMapper.readTree(new File(dataFile));
+        List<SimilarAsinResultRowDto> rows = new ArrayList<>();
+        if (root.isArray()) {
+            for (JsonNode node : root) {
+                rows.add(fromJson(objectMapper, node));
+            }
+        } else {
+            rows.add(fromJson(objectMapper, root));
+        }
+        System.out.println("[verify] loaded rows=" + rows.size() + " imgSwitch=" + imgSwitch
+                + " categorySwitch=" + categorySwitch);
+        if (imgSwitch && categorySwitch) {
+            System.out.println("[verify] raw first row alibaba[0].url="
+                    + (rows.isEmpty() || rows.get(0).getAlibaba().isEmpty() ? "null"
+                    : rows.get(0).getAlibaba().get(0).getUrl()));
+        }
+
+        SimilarAsinProperties props = new SimilarAsinProperties();
+        props.setLlmApiKey(apiKey);
+        props.setLlmRowConcurrency(2);
+        props.setLlmImageDownloadTimeoutSeconds(10);
+
+        SimilarAsinLlmClient client = new SimilarAsinLlmClient(props, objectMapper, null);
+        OssProperties ossProps = new OssProperties();
+        ossProps.setEndpoint("https://oss.aishufu.top");
+        ossProps.setPublicEndpoint("https://oss.aishufu.top");
+        ossProps.setBucket("nanri-ai-images");
+        ossProps.setAccessKeyId("appuser");
+        ossProps.setAccessKeySecret("AppUser@2024SecureKey");
+        OssStorageService oss = new OssStorageService(ossProps);
+        PuzzleImageMerger merger = new PuzzleImageMerger(props);
+
+        // 生产真实类目数据（导出自 biz_product_category），spy 类目服务按 parentId 过滤。
+        List<com.nanri.aiimage.modules.productcategory.model.entity.ProductCategoryEntity> categories = loadCategories(objectMapper);
+        ProductCategoryService categoryService = Mockito.spy(new ProductCategoryService(
+                Mockito.mock(com.nanri.aiimage.modules.productcategory.mapper.ProductCategoryMapper.class)));
+        Mockito.doAnswer(invocation -> {
+            Long parentId = invocation.getArgument(0);
+            List<com.nanri.aiimage.modules.productcategory.model.vo.ProductCategoryItemVo> items = categories.stream()
+                    .filter(c -> parentId == null ? c.getParentId() == null : parentId.equals(c.getParentId()))
+                    .map(c -> {
+                        com.nanri.aiimage.modules.productcategory.model.vo.ProductCategoryItemVo item =
+                                new com.nanri.aiimage.modules.productcategory.model.vo.ProductCategoryItemVo();
+                        item.setId(c.getId());
+                        item.setParentId(c.getParentId());
+                        item.setName(c.getName());
+                        item.setCategoryKey(c.getCategoryKey());
+                        return item;
+                    })
+                    .toList();
+            com.nanri.aiimage.modules.productcategory.model.vo.ProductCategoryListVo vo =
+                    new com.nanri.aiimage.modules.productcategory.model.vo.ProductCategoryListVo();
+            vo.setItems(items);
+            vo.setTree(List.of());
+            vo.setTotal((long) items.size());
+            vo.setPage(1L);
+            vo.setPageSize((long) Math.max(1, items.size()));
+            vo.setHasMore(false);
+            return vo;
+        }).when(categoryService).children(Mockito.any(), Mockito.anyLong(), Mockito.anyLong());
+
+        SimilarAsinLlmService service = new SimilarAsinLlmService(
+                client, props, ossProps, categoryService, merger, oss);
+
+        long start = System.currentTimeMillis();
+        List<SimilarAsinResultRowDto> result = service.inspectRows(rows, null, apiKey, imgSwitch, categorySwitch);
+        long elapsed = System.currentTimeMillis() - start;
+        System.out.println("[verify] done rows=" + result.size() + " elapsedMs=" + elapsed);
+        for (SimilarAsinResultRowDto row : result) {
+            System.out.println(String.format(
+                    "asin=%s | status=%s | isConform=%s | category=%s | reason=%s | isStock=%s | similarity=%s | mainUrl=%s | puzzle1=%s | puzzle2=%s",
+                    row.getAsin(), row.getStatus(), row.getIsConform(), row.getCategory(),
+                    row.getReason(), row.getIsStock(), row.getSimilarity(),
+                    shorten(row.getMainUrl()), shorten(row.getPuzzleImg1()), shorten(row.getPuzzleImg2())));
+        }
+    }
+
+    private static List<com.nanri.aiimage.modules.productcategory.model.entity.ProductCategoryEntity> loadCategories(ObjectMapper objectMapper) throws Exception {
+        com.fasterxml.jackson.databind.JsonNode root = objectMapper.readTree(
+                SimilarAsinLlmLocalVerify.class.getResourceAsStream("/categories.json"));
+        List<com.nanri.aiimage.modules.productcategory.model.entity.ProductCategoryEntity> list = new ArrayList<>();
+        for (com.fasterxml.jackson.databind.JsonNode node : root) {
+            com.nanri.aiimage.modules.productcategory.model.entity.ProductCategoryEntity entity =
+                    new com.nanri.aiimage.modules.productcategory.model.entity.ProductCategoryEntity();
+            entity.setId(node.get("id").asLong());
+            if (!node.get("parent_id").isNull()) {
+                entity.setParentId(node.get("parent_id").asLong());
+            }
+            entity.setName(node.get("name").asText());
+            entity.setCategoryKey(node.get("category_key").asText());
+            entity.setSortOrder(node.get("sort_order").isNull() ? null : node.get("sort_order").asInt());
+            entity.setDescription(node.get("description").isNull() ? null : node.get("description").asText());
+            entity.setIsBuiltin(node.get("is_builtin") != null && node.get("is_builtin").asBoolean());
+            list.add(entity);
+        }
+        return list;
+    }
+
+    private static SimilarAsinResultRowDto fromJson(ObjectMapper objectMapper, JsonNode node) throws Exception {
+        SimilarAsinResultRowDto row = new SimilarAsinResultRowDto();
+        row.setAsin(text(node, "asin"));
+        row.setTitle(text(node, "title"));
+        row.setSku(text(node, "sku"));
+        row.setCountry(text(node, "country"));
+        row.setUrl(text(node, "url"));
+        JsonNode alibaba = node.get("alibaba");
+        if (alibaba != null && alibaba.isArray()) {
+            List<SimilarAsinResultRowDto.AlibabaItem> items = new ArrayList<>();
+            for (JsonNode item : alibaba) {
+                items.add(objectMapper.treeToValue(item, SimilarAsinResultRowDto.AlibabaItem.class));
+            }
+            row.setAlibaba(items);
+        }
+        return row;
+    }
+
+    private static String text(JsonNode node, String field) {
+        JsonNode value = node.get(field);
+        return value == null || value.isNull() ? null : value.asText();
+    }
+
+    private static String shorten(String value) {
+        if (value == null) {
+            return "null";
+        }
+        return value.length() <= 70 ? value : value.substring(0, 70) + "...";
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinLlmServiceTest.java

@@ -0,0 +1,279 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.nanri.aiimage.config.OssProperties;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.productcategory.model.vo.ProductCategoryItemVo;
+import com.nanri.aiimage.modules.productcategory.model.vo.ProductCategoryListVo;
+import com.nanri.aiimage.modules.productcategory.service.ProductCategoryService;
+import com.nanri.aiimage.modules.similarasin.client.SimilarAsinLlmClient;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinResultRowDto;
+import com.nanri.aiimage.modules.similarasin.util.PuzzleImageMerger;
+import org.junit.jupiter.api.Test;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyList;
+import static org.mockito.ArgumentMatchers.anyLong;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import org.mockito.Mockito;
+
+class SimilarAsinLlmServiceTest {
+
+    private static byte[] jpegBytes() {
+        try {
+            BufferedImage image = new BufferedImage(10, 10, BufferedImage.TYPE_INT_RGB);
+            ByteArrayOutputStream baos = new ByteArrayOutputStream();
+            ImageIO.write(image, "jpg", baos);
+            return baos.toByteArray();
+        } catch (Exception ex) {
+            throw new IllegalStateException(ex);
+        }
+    }
+
+    private SimilarAsinProperties properties() {
+        SimilarAsinProperties props = new SimilarAsinProperties();
+        props.setLlmApiKey("test-key");
+        return props;
+    }
+
+    private SimilarAsinLlmService service(SimilarAsinLlmClient llmClient) {
+        OssStorageService ossStorage = mock(OssStorageService.class);
+        when(ossStorage.getPublicUrl(anyString())).thenAnswer(invocation -> "https://oss.aishufu.top/nanri-ai-images/" + invocation.getArgument(0));
+        PuzzleImageMerger merger = mock(PuzzleImageMerger.class);
+        when(merger.merge(anyList(), Mockito.<SimilarAsinResultRowDto>any())).thenReturn(jpegBytes());
+        ProductCategoryService categoryService = mock(ProductCategoryService.class);
+        when(categoryService.children(any(), anyLong(), anyLong()))
+                .thenAnswer(invocation -> {
+                    Long parentId = invocation.getArgument(0);
+                    if (parentId == null) {
+                        return categoryPage("类目A", 1L);
+                    }
+                    if (parentId == 1L) {
+                        return categoryPage("类目B", 2L);
+                    }
+                    if (parentId == 2L) {
+                        return categoryPage("类目C", 3L);
+                    }
+                    return emptyCategoryPage();
+                });
+        SimilarAsinLlmService svc = new SimilarAsinLlmService(
+                llmClient,
+                properties(),
+                mock(OssProperties.class),
+                categoryService,
+                merger,
+                ossStorage);
+        svc.setDownloadHttpClientForTest(mockHttpClient());
+        return svc;
+    }
+
+    private static ProductCategoryListVo categoryPage(String name, long id) {
+        ProductCategoryItemVo item = new ProductCategoryItemVo();
+        item.setId(id);
+        item.setName(name);
+        ProductCategoryListVo vo = new ProductCategoryListVo();
+        vo.setItems(List.of(item));
+        vo.setTotal(1L);
+        vo.setPage(1L);
+        vo.setPageSize(1L);
+        vo.setHasMore(false);
+        return vo;
+    }
+
+    private static ProductCategoryListVo emptyCategoryPage() {
+        ProductCategoryListVo vo = new ProductCategoryListVo();
+        vo.setItems(List.of());
+        vo.setTotal(0L);
+        vo.setPage(1L);
+        vo.setPageSize(1L);
+        vo.setHasMore(false);
+        return vo;
+    }
+
+    private static HttpClient mockHttpClient() {
+        HttpClient client = mock(HttpClient.class);
+        try {
+            when(client.send(any(HttpRequest.class), any(HttpResponse.BodyHandler.class)))
+                    .thenAnswer(invocation -> {
+                        byte[] body = jpegBytes();
+                        HttpRequest request = invocation.getArgument(0);
+                        return new TestHttpResponse(200, body, request);
+                    });
+        } catch (Exception ex) {
+            throw new IllegalStateException(ex);
+        }
+        return client;
+    }
+
+    private static final class TestHttpResponse implements HttpResponse<byte[]> {
+        private final int statusCode;
+        private final byte[] body;
+        private final HttpRequest request;
+
+        TestHttpResponse(int statusCode, byte[] body, HttpRequest request) {
+            this.statusCode = statusCode;
+            this.body = body;
+            this.request = request;
+        }
+
+        @Override
+        public int statusCode() {
+            return statusCode;
+        }
+
+        @Override
+        public HttpRequest request() {
+            return request;
+        }
+
+        @Override
+        public java.util.Optional<HttpResponse<byte[]>> previousResponse() {
+            return java.util.Optional.empty();
+        }
+
+        @Override
+        public java.net.http.HttpHeaders headers() {
+            return java.net.http.HttpHeaders.of(Map.of(), (a, b) -> true);
+        }
+
+        @Override
+        public byte[] body() {
+            return body;
+        }
+
+        @Override
+        public java.net.URI uri() {
+            return java.net.URI.create("http://test");
+        }
+
+        @Override
+        public java.net.http.HttpClient.Version version() {
+            return HttpClient.Version.HTTP_1_1;
+        }
+
+        @Override
+        public java.util.Optional<javax.net.ssl.SSLSession> sslSession() {
+            return java.util.Optional.empty();
+        }
+    }
+
+
+    private SimilarAsinLlmClient llmClient(String apiKey, Map<String, String> responses) {
+        SimilarAsinLlmClient client = mock(SimilarAsinLlmClient.class);
+        when(client.resolveApiKey(anyString())).thenReturn(apiKey == null ? "" : apiKey);
+        when(client.hasApiKey(anyString())).thenReturn(apiKey != null && !apiKey.isBlank());
+        when(client.invokeChat(anyString(), anyString(), anyString(), anyString()))
+                .thenAnswer(invocation -> {
+                    String response = responses.get("chat");
+                    if (response == null) {
+                        throw new IllegalStateException("unexpected chat call");
+                    }
+                    return response;
+                });
+        when(client.invokeChatWithImages(anyString(), anyString(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> {
+                    String response = responses.get("images");
+                    if (response == null) {
+                        throw new IllegalStateException("unexpected images call");
+                    }
+                    return response;
+                });
+        return client;
+    }
+
+    private static final com.fasterxml.jackson.databind.ObjectMapper OBJECT_MAPPER =
+            new com.fasterxml.jackson.databind.ObjectMapper();
+
+    /** 类目匹配（按序号返回不同类目名）与合规检查（后续）返回不同 JSON。 */
+    private SimilarAsinLlmClient llmClientStaged(String apiKey, List<String> categoryJsons,
+                                                 String conformJson, String imagesJson) {
+        SimilarAsinLlmClient client = mock(SimilarAsinLlmClient.class);
+        int[] categoryIndex = {0};
+        when(client.resolveApiKey(anyString())).thenReturn(apiKey);
+        when(client.hasApiKey(anyString())).thenReturn(apiKey != null && !apiKey.isBlank());
+        when(client.invokeChat(anyString(), anyString(), anyString(), anyString()))
+                .thenAnswer(invocation -> {
+                    if (categoryIndex[0] < categoryJsons.size()) {
+                        return categoryJsons.get(categoryIndex[0]++);
+                    }
+                    return conformJson;
+                });
+        when(client.invokeChatWithImages(anyString(), anyString(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> imagesJson);
+        when(client.parseJsonContent(anyString()))
+                .thenAnswer(invocation -> parseJson(invocation.getArgument(0)));
+        return client;
+    }
+
+    private static com.fasterxml.jackson.databind.JsonNode parseJson(String content) {
+        try {
+            return OBJECT_MAPPER.readTree(content);
+        } catch (Exception ex) {
+            throw new IllegalStateException(ex);
+        }
+    }
+
+    @Test
+    void noApiKeyKeepsRawRows() {
+        SimilarAsinLlmService service = service(llmClient("", Map.of()));
+        SimilarAsinResultRowDto row = new SimilarAsinResultRowDto();
+        row.setAsin("B0TEST");
+        List<SimilarAsinResultRowDto> result = service.inspectRows(List.of(row), "", "", true, true);
+        assertEquals(1, result.size());
+        assertEquals("B0TEST", result.get(0).getAsin());
+        assertNull(result.get(0).getStatus());
+    }
+
+    @Test
+    void categorySwitchOffOnlyPreparesImagesAndMarksNotExistsWhenNoMainUrl() {
+        SimilarAsinLlmService service = service(llmClient("k", Map.of()));
+        SimilarAsinResultRowDto row = new SimilarAsinResultRowDto();
+        row.setAsin("B0TEST");
+        row.setTitle("Test product");
+        List<SimilarAsinResultRowDto> result = service.inspectRows(List.of(row), "", "k", false, false);
+        assertEquals(1, result.size());
+        assertEquals("不存在", result.get(0).getStatus());
+        assertNull(result.get(0).getIsConform());
+        assertNull(result.get(0).getPuzzleImg1());
+    }
+
+    @Test
+    void imageCompareStopsOnStockAndFillsFields() {
+        // 前 2 次 chat：一级/二级类目匹配返回名称（Java 按名回查候选取真实 ID）；第 3 次：合规检查。
+        SimilarAsinLlmClient client = llmClientStaged("k", List.of("{\"name\":\"类目A\"}", "{\"name\":\"类目B\"}"),
+                "{\"asin\":\"B0TEST\",\"is_conform\":\"符合\",\"reason\":\"无\",\"category\":\"类目A->类目B->类目C\"}",
+                "{\"asin\":\"B0TEST\",\"is_stock\":\"有货\",\"similarity\":\"95%\",\"status\":\"成功\",\"is_conform\":\"符合\",\"category\":\"类目A->类目B->类目C\"}");
+        SimilarAsinLlmService service = service(client);
+
+        SimilarAsinResultRowDto row = new SimilarAsinResultRowDto();
+        row.setAsin("B0TEST");
+        row.setTitle("Test product");
+        row.setUrl("https://m.media-amazon.com/images/I/main.jpg");
+        SimilarAsinResultRowDto.AlibabaItem item = new SimilarAsinResultRowDto.AlibabaItem();
+        item.setUrl("https://cbu01.alicdn.com/img/1.jpg");
+        row.setAlibaba(List.of(item));
+
+        // 一级/二级都匹配（按名回查 ID），三级候选可用，合规符合 → 图片对比，有货即停。
+        List<SimilarAsinResultRowDto> result = service.inspectRows(List.of(row), "", "k", true, true);
+        assertEquals(1, result.size());
+        SimilarAsinResultRowDto out = result.get(0);
+        assertEquals("成功", out.getStatus());
+        assertEquals("有货", out.getIsStock());
+        assertEquals("95%", out.getSimilarity());
+        assertEquals("符合", out.getIsConform());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceChunkKeysetTest.java

@@ -0,0 +1,204 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.nanri.aiimage.common.exception.BusinessException;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.model.entity.TaskChunkEntity;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 9：chunk 查询从单行分页改为批量 keyset 分页，保持低内存读取。
+ * loadChunksKeyset 按 id 递增分批拉取（每批 pageSize），最后按 chunkIndex 升序合并，
+ * 避免超大任务一次 selectList 全量载入 chunk 元数据。
+ * mock 分页由 wrapper 中 gt("id", lastId) 的 keyset 值驱动，保证重复调用可复现（幂等）。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceChunkKeysetTest {
+
+    private static final String MODULE = "similar-asin";
+
+    @Mock private TaskChunkMapper taskChunkMapper;
+
+    private static TaskChunkEntity chunk(long id, int chunkIndex) {
+        TaskChunkEntity chunk = new TaskChunkEntity();
+        chunk.setId(id);
+        chunk.setTaskId(7004L);
+        chunk.setModuleType(MODULE);
+        chunk.setChunkIndex(chunkIndex);
+        return chunk;
+    }
+
+    private static List<TaskChunkEntity> chunks(long... idsAndIndexes) {
+        List<TaskChunkEntity> result = new ArrayList<>();
+        for (int i = 0; i < idsAndIndexes.length; i += 2) {
+            result.add(chunk(idsAndIndexes[i], (int) idsAndIndexes[i + 1]));
+        }
+        return result;
+    }
+
+    /** 从 wrapper 的 SQL 片段解析 keyset：匹配 "id > #{ew.paramNameValuePairs.键}" 后从参数表取值。 */
+    private static long keysetOf(QueryWrapper<TaskChunkEntity> wrapper) {
+        java.util.regex.Matcher m = java.util.regex.Pattern
+                .compile("id\\s*>\\s*#\\{ew\\.paramNameValuePairs\\.(\\w+)\\}", java.util.regex.Pattern.CASE_INSENSITIVE)
+                .matcher(wrapper.getSqlSegment());
+        if (m.find()) {
+            Object value = wrapper.getParamNameValuePairs().get(m.group(1));
+            if (value instanceof Number number) {
+                return number.longValue();
+            }
+        }
+        return 0L;
+    }
+
+    /** 按 keyset 驱动分页：每次 selectList 返回 id > keyset 的下一批，天然支持重复调用。 */
+    private void stubKeysetPages(List<TaskChunkEntity> all, int pageSize) {
+        int batch = pageSize > 0 ? pageSize : 500;
+        doAnswer(invocation -> {
+            long lastId = keysetOf(invocation.getArgument(0));
+            return all.stream().filter(c -> c.getId() > lastId).limit(batch).toList();
+        }).when(taskChunkMapper).selectList(any());
+    }
+
+    private List<Long> keysetIdsFromRounds(int rounds) {
+        ArgumentCaptor<QueryWrapper<TaskChunkEntity>> captor =
+                ArgumentCaptor.forClass(QueryWrapper.class);
+        verify(taskChunkMapper, times(rounds)).selectList(captor.capture());
+        List<Long> keysets = new ArrayList<>();
+        for (QueryWrapper<TaskChunkEntity> wrapper : captor.getAllValues()) {
+            keysets.add(keysetOf(wrapper));
+        }
+        return keysets;
+    }
+
+    @Test
+    void test_task_009_chunk_normal_default_path() {
+        // 正常输入：chunk 数小于 pageSize，一轮拉完，结果全且按 chunkIndex 有序
+        List<TaskChunkEntity> all = chunks(1, 1, 2, 2, 3, 3);
+        stubKeysetPages(all, 500);
+        List<TaskChunkEntity> result = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 500);
+        assertEquals(3, result.size());
+        assertEquals(List.of(1, 2, 3), result.stream().map(TaskChunkEntity::getChunkIndex).toList());
+        assertEquals(List.of(0L), keysetIdsFromRounds(1), "首轮 keyset 为 0");
+    }
+
+    @Test
+    void test_task_009_chunk_normal_multiple_items() {
+        // 超过 pageSize：多轮拉取，keyset 逐轮推进，全部合并且按 chunkIndex 升序、无重复
+        List<TaskChunkEntity> all = chunks(1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7);
+        stubKeysetPages(all, 3);
+        List<TaskChunkEntity> result = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 3);
+        assertEquals(7, result.size());
+        assertEquals(List.of(1, 2, 3, 4, 5, 6, 7), result.stream().map(TaskChunkEntity::getChunkIndex).toList());
+        long distinctIds = result.stream().map(TaskChunkEntity::getId).distinct().count();
+        assertEquals(7, distinctIds, "keyset 分页不能产生重复 chunk");
+        assertEquals(List.of(0L, 3L, 6L), keysetIdsFromRounds(3), "keyset 逐轮推进，不足一批即止");
+    }
+
+    @Test
+    void test_task_009_chunk_normal_repeated_operation_is_idempotent() {
+        // 重复执行同一输入：每轮都从 keyset=0 开始，结果一致
+        List<TaskChunkEntity> all = chunks(1, 1, 2, 2, 3, 3);
+        stubKeysetPages(all, 500);
+        List<TaskChunkEntity> first = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 500);
+        List<TaskChunkEntity> second = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 500);
+        assertEquals(first.size(), second.size());
+        for (int i = 0; i < first.size(); i++) {
+            assertEquals(first.get(i).getId(), second.get(i).getId());
+        }
+        assertEquals(List.of(0L, 0L), keysetIdsFromRounds(2), "重复执行每轮都从 keyset=0 开始");
+    }
+
+    @Test
+    void test_task_009_chunk_boundary_empty_input() {
+        // 空集合：返回空列表，不创建无效资源，且只查一轮
+        stubKeysetPages(List.of(), 500);
+        List<TaskChunkEntity> result = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 500);
+        assertNotNull(result);
+        assertEquals(0, result.size());
+        verify(taskChunkMapper, times(1)).selectList(any());
+    }
+
+    @Test
+    void test_task_009_chunk_boundary_single_item() {
+        // 单 chunk：一轮返回后 keyset 推进即拉空，不依赖批量路径
+        List<TaskChunkEntity> all = chunks(42, 9);
+        stubKeysetPages(all, 1);
+        List<TaskChunkEntity> result = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 1);
+        assertEquals(1, result.size());
+        assertEquals(9, result.get(0).getChunkIndex());
+        assertEquals(42L, result.get(0).getId());
+    }
+
+    @Test
+    void test_task_009_chunk_boundary_limit_and_overflow() {
+        // chunk 数恰好等于 pageSize 的倍数：最后一轮仍返回非空才继续，全部取回
+        List<TaskChunkEntity> all = chunks(1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6);
+        stubKeysetPages(all, 3);
+        List<TaskChunkEntity> result = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 3);
+        assertEquals(6, result.size());
+        // pageSize 为 0/负数：回退默认 500，不抛异常
+        stubKeysetPages(all, 0);
+        List<TaskChunkEntity> fallback = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 0);
+        assertEquals(6, fallback.size());
+        stubKeysetPages(all, -5);
+        List<TaskChunkEntity> negative = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, -5);
+        assertEquals(6, negative.size());
+    }
+
+    @Test
+    void test_task_009_chunk_invalid_input_rejected() {
+        // taskId 为 null：安全返回空列表，不发起查询
+        List<TaskChunkEntity> result = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, null, MODULE, 500);
+        assertNotNull(result);
+        assertEquals(0, result.size());
+        verify(taskChunkMapper, times(0)).selectList(any());
+        // mapper 查询抛异常：转项目约定异常，消息可识别
+        when(taskChunkMapper.selectList(any())).thenThrow(new IllegalStateException("db down"));
+        BusinessException ex = assertThrows(BusinessException.class,
+                () -> SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 500));
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("chunk"),
+                "异常消息必须可识别，实际: " + ex.getMessage());
+    }
+
+    @Test
+    void test_task_009_chunk_dependency_failure_releases_resources() {
+        // 第二轮查询失败：抛异常不返回半截结果；恢复后重试可完整返回
+        List<TaskChunkEntity> all = chunks(1, 1, 2, 2, 3, 3, 4, 4, 5, 5);
+        doAnswer(invocation -> {
+            long lastId = keysetOf(invocation.getArgument(0));
+            if (lastId == 0L) {
+                return all.subList(0, 3);
+            }
+            if (lastId == 3L) {
+                throw new IllegalStateException("db down mid-page");
+            }
+            return all.subList(3, 5);
+        }).when(taskChunkMapper).selectList(any());
+        BusinessException ex = assertThrows(BusinessException.class,
+                () -> SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 3));
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("chunk"),
+                "异常消息必须可识别，实际: " + ex.getMessage());
+        // 恢复后重试成功：5 个 chunk 全部取回
+        stubKeysetPages(all, 3);
+        List<TaskChunkEntity> recovered = SimilarAsinTaskService.loadChunksKeyset(taskChunkMapper, 7004L, MODULE, 3);
+        assertEquals(5, recovered.size());
+        assertEquals(List.of(1, 2, 3, 4, 5), recovered.stream().map(TaskChunkEntity::getChunkIndex).toList());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceChunkMergeLimitTest.java

@@ -0,0 +1,399 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinResultRowDto;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskChunkEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.lang.reflect.Method;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 13：chunk 合并增加单次最大行数与 payload 字节上限。
+ * 校验点位于 mergeChunkPayload 单次合并入口：合并后总行数超过 chunkMergeMaxRows、
+ * 或 payload 字节超过 chunkMergePayloadMaxBytes 时，从最旧行开始降级到
+ * orphan 兜底（assemble 阶段 putIfAbsent 合并回结果，不丢数据）；
+ * 单行本身超过字节上限时抛可识别异常拒绝合并。低于上限的行为与旧路径完全一致。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceChunkMergeLimitTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(90000);
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private com.nanri.aiimage.modules.file.service.oss.OssStorageService ossStorageService;
+    @Mock private com.nanri.aiimage.config.StorageProperties storageProperties;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskFileJobService taskFileJobService;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskDistributedLockService taskDistributedLockService;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskProgressSnapshotService taskProgressSnapshotService;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private org.springframework.transaction.PlatformTransactionManager transactionManager;
+    @Mock private com.nanri.aiimage.common.service.DistributedJobLockService distributedJobLockService;
+    @Mock private com.nanri.aiimage.config.InstanceMetadata instanceMetadata;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private SimilarAsinImagePrefetchService imagePrefetchService;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+        TableInfoHelper.initTableInfo(assistant, TaskChunkEntity.class);
+        TableInfoHelper.initTableInfo(assistant, TaskScopeStateEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        lenient().when(properties.getMaxSourceFileBytes()).thenReturn(50L * 1024L * 1024L);
+        lenient().when(properties.getMaxParseRows()).thenReturn(50000);
+        lenient().when(properties.getMaxFieldLength()).thenReturn(2000);
+        lenient().when(properties.getMaxWorkbookZipEntries()).thenReturn(20000);
+        lenient().when(properties.getMaxWorkbookUncompressedBytes()).thenReturn(512L * 1024L * 1024L);
+        lenient().when(properties.getChunkMergeMaxRows()).thenReturn(50000);
+        lenient().when(properties.getChunkMergePayloadMaxBytes()).thenReturn(16L * 1024L * 1024L);
+        lenient().when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenReturn("rustfs:task-parsed/similar-asin/90000/payload.json");
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private static SimilarAsinResultRowDto row(String rowToken, String asin, String title) {
+        SimilarAsinResultRowDto r = new SimilarAsinResultRowDto();
+        r.setRowToken(rowToken);
+        r.setId(rowToken);
+        r.setAsin(asin);
+        r.setCountry("英国");
+        r.setTitle(title);
+        return r;
+    }
+
+    private static String rowsJson(List<SimilarAsinResultRowDto> rows) throws Exception {
+        return new ObjectMapper().writeValueAsString(rows);
+    }
+
+    private static TaskChunkEntity chunk(Long id, String scopeHash, Integer chunkIndex, String payloadJson) {
+        TaskChunkEntity chunk = new TaskChunkEntity();
+        chunk.setId(id);
+        chunk.setTaskId(9004L);
+        chunk.setModuleType(SimilarAsinTaskService.MODULE_TYPE);
+        chunk.setScopeHash(scopeHash);
+        chunk.setChunkIndex(chunkIndex);
+        chunk.setPayloadJson(payloadJson);
+        return chunk;
+    }
+
+    /** 记录每次 storeChunkPayloadVersioned 收到的 payload 字符串。 */
+    private void stubChunkMerge(TaskChunkEntity chunk, String payloadJson, AtomicReference<String> storedPayload) throws Exception {
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk));
+        when(transientPayloadStorageService.resolvePayload(eq(chunk.getPayloadJson()), anyString()))
+                .thenReturn(payloadJson);
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> {
+                    storedPayload.set(invocation.getArgument(4));
+                    return "stored:" + invocation.getArgument(2);
+                });
+        when(taskChunkMapper.selectOne(any())).thenReturn(chunk);
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+    }
+
+    private static void invokeMerge(SimilarAsinTaskService service, FileTaskEntity task,
+                                    String scopeHash, Integer chunkIndex,
+                                    List<SimilarAsinResultRowDto> llmRows) throws Exception {
+        Method merge = SimilarAsinTaskService.class.getDeclaredMethod("mergeLlmRowsIntoChunk",
+                FileTaskEntity.class, String.class, Integer.class, List.class, Map.class);
+        merge.setAccessible(true);
+        merge.invoke(service, task, scopeHash, chunkIndex, llmRows, Map.of());
+    }
+
+    @Test
+    void test_task_013_payload_row_count_chunk_normal_default_path() throws Exception {
+        // 正常输入：行数与 payload 字节均在上限内，合并走原路径，结果完整保留。
+        TaskChunkEntity chunk = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        AtomicReference<String> storedPayload = new AtomicReference<>("");
+        stubChunkMerge(chunk, rowsJson(List.of(row("r0", "B0A0000000", "存量行"))), storedPayload);
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(9004L);
+        List<SimilarAsinResultRowDto> llmRows = List.of(
+                row("r1", "B0A0000001", "标题1"),
+                row("r2", "B0A0000002", "标题2"),
+                row("r3", "B0A0000003", "标题3"));
+
+        invokeMerge(service, task, "hashA", 1, llmRows);
+        assertNotNull(storedPayload.get());
+        assertTrue(storedPayload.get().contains("\"r1\"") && storedPayload.get().contains("\"r3\""),
+                "上限内合并必须完整保留存量行与新增行，实际: " + storedPayload.get());
+        verify(transientPayloadStorageService, times(1)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        verify(taskChunkMapper, times(1)).update(any(), any());
+        verify(taskScopeStateMapper, times(0)).insert(any(TaskScopeStateEntity.class));
+    }
+
+    @Test
+    void test_task_013_payload_row_count_chunk_normal_multiple_items() throws Exception {
+        // 批量场景：多 chunk 一次 merge，全部在上限内，各 chunk 分别写回、结果不丢失。
+        TaskChunkEntity chunkA = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        TaskChunkEntity chunkB = chunk(2L, "hashB", 2, "ptr:chunk-B");
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunkA, chunkB));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r1", "B0A0000001", "标题1"))));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-B"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r2", "B0A0000002", "标题2"))));
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> "stored:" + invocation.getArgument(2));
+        AtomicLong selectOneRound = new AtomicLong(0);
+        when(taskChunkMapper.selectOne(any())).thenAnswer(invocation ->
+                selectOneRound.getAndIncrement() == 0 ? chunkA : chunkB);
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(9004L);
+        invokeMerge(service, task, null, null, List.of(
+                row("r1", "B0A0000001", "标题1-新"),
+                row("r2", "B0A0000002", "标题2-新")));
+
+        verify(transientPayloadStorageService, times(2)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        verify(taskChunkMapper, times(2)).update(any(), any());
+    }
+
+    @Test
+    void test_task_013_payload_row_count_chunk_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复执行同一输入：每次 merge 恰好写一次，不产生重复对象、重复状态。
+        TaskChunkEntity chunk = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        AtomicLong storeCalls = new AtomicLong(0);
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r0", "B0A0000000", "存量行"))));
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> {
+                    storeCalls.incrementAndGet();
+                    return "stored:" + invocation.getArgument(2);
+                });
+        when(taskChunkMapper.selectOne(any())).thenReturn(chunk);
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(9004L);
+        List<SimilarAsinResultRowDto> llmRows = List.of(row("r1", "B0A0000001", "标题1"));
+        invokeMerge(service, task, "hashA", 1, llmRows);
+        invokeMerge(service, task, "hashA", 1, llmRows);
+        assertEquals(2, storeCalls.get(), "重复执行同一输入：每次 merge 恰好写回一次，无多余请求");
+        verify(taskScopeStateMapper, times(0)).insert(any(TaskScopeStateEntity.class));
+    }
+
+    @Test
+    void test_task_013_payload_row_count_chunk_boundary_empty_input() throws Exception {
+        // 空输入：null/空列表安全跳过，不读取 chunk、不写存储、不创建资源。
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(9004L);
+        invokeMerge(service, task, "hashA", 1, null);
+        invokeMerge(service, task, "hashA", 1, List.of());
+        verify(taskChunkMapper, times(0)).selectList(any());
+        verify(transientPayloadStorageService, times(0)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        verify(taskScopeStateMapper, times(0)).insert(any(TaskScopeStateEntity.class));
+    }
+
+    @Test
+    void test_task_013_payload_row_count_chunk_boundary_single_item() throws Exception {
+        // 单行：不依赖批量路径，合并后结果正确。
+        TaskChunkEntity chunk = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        AtomicReference<String> storedPayload = new AtomicReference<>("");
+        stubChunkMerge(chunk, rowsJson(List.of(row("r0", "B0A0000000", "存量行"))), storedPayload);
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(9004L);
+        invokeMerge(service, task, "hashA", 1, List.of(row("r1", "B0A0000001", "标题1")));
+
+        assertTrue(storedPayload.get().contains("\"r1\""), "单行合并也必须写回 chunk payload，实际: " + storedPayload.get());
+        verify(taskChunkMapper, times(1)).update(any(), any());
+    }
+
+    @Test
+    void test_task_013_payload_row_count_chunk_boundary_limit_and_overflow() throws Exception {
+        // 超限场景三连：行数超限降级、字节超限降级、单行超字节上限拒绝。
+        lenient().when(properties.getChunkMergeMaxRows()).thenReturn(2);
+        TaskChunkEntity chunk = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        AtomicLong storeCalls = new AtomicLong(0);
+        AtomicReference<String> lastStoredPayload = new AtomicReference<>("");
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r0", "B0A0000000", "存量行"))));
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> {
+                    storeCalls.incrementAndGet();
+                    lastStoredPayload.set(invocation.getArgument(4));
+                    return "stored:" + invocation.getArgument(2);
+                });
+        when(taskChunkMapper.selectOne(any())).thenReturn(chunk);
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(9004L);
+        List<SimilarAsinResultRowDto> llmRows = new ArrayList<>();
+        for (int i = 0; i < 5; i++) {
+            llmRows.add(row("r" + (i + 1), "B0A00000" + (i + 1), "新行" + i));
+        }
+
+        // Phase A：行数超限（上限 2，存量 1 + 新增 5）→ 只保留上限内最新行，超限部分转 orphan。
+        invokeMerge(service, task, "hashA", 1, llmRows);
+        assertTrue(lastStoredPayload.get().contains("\"r4\"") && lastStoredPayload.get().contains("\"r5\""),
+                "行数超限时保留上限内的最新行，实际: " + lastStoredPayload.get());
+        assertFalse(lastStoredPayload.get().contains("\"r0\""), "行数超限时最旧行被降级，实际: " + lastStoredPayload.get());
+        assertEquals(1, storeCalls.get());
+        verify(taskScopeStateMapper, times(1)).insert(any(TaskScopeStateEntity.class));
+        verify(transientPayloadStorageService, times(1))
+                .storeParsedPayloadEntry(anyString(), any(), anyString(), anyString(), anyString(), eq(true));
+
+        // Phase B：字节超限（行数放开）→ 从最旧行降级到字节上限内，保留最新结果。
+        lenient().when(properties.getChunkMergeMaxRows()).thenReturn(50000);
+        long oneRowBytes = rowsJson(List.of(row("r9", "B0A0000099", "样本行"))).getBytes(StandardCharsets.UTF_8).length;
+        lenient().when(properties.getChunkMergePayloadMaxBytes()).thenReturn(oneRowBytes + 5L);
+        invokeMerge(service, task, "hashA", 1, llmRows);
+        assertTrue(lastStoredPayload.get().contains("\"r5\""), "字节超限时保留最新行，实际: " + lastStoredPayload.get());
+        assertFalse(lastStoredPayload.get().contains("\"r0\""), "字节超限时最旧行被降级，实际: " + lastStoredPayload.get());
+        assertEquals(2, storeCalls.get());
+        verify(taskScopeStateMapper, times(2)).insert(any(TaskScopeStateEntity.class));
+
+        // Phase C：单行本身超过字节上限 → 抛可识别异常拒绝合并，不写 chunk。
+        lenient().when(properties.getChunkMergePayloadMaxBytes()).thenReturn(5L);
+        Exception ex = assertThrows(Exception.class, () -> {
+            try {
+                invokeMerge(service, task, "hashA", 1, llmRows);
+            } catch (java.lang.reflect.InvocationTargetException e) {
+                throw e.getCause();
+            }
+        });
+        assertNotNull(ex.getMessage());
+        assertTrue(ex.getMessage().contains("字节上限"),
+                "超字节上限必须抛可识别异常，实际: " + ex.getMessage());
+        assertEquals(2, storeCalls.get(), "拒绝合并时不写 chunk");
+    }
+
+    @Test
+    void test_task_013_payload_row_count_chunk_invalid_input_rejected() {
+        // 非法输入：chunk 载荷加载失败（resolve 抛异常）时抛出可识别异常且不写 chunk。
+        TaskChunkEntity chunk = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenThrow(new IllegalStateException("rustfs down"));
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(9004L);
+        Exception ex = assertThrows(Exception.class, () -> {
+            try {
+                invokeMerge(service, task, "hashA", 1, List.of(row("r1", "B0A0000001", "标题1")));
+            } catch (java.lang.reflect.InvocationTargetException e) {
+                throw e.getCause();
+            }
+        });
+        assertNotNull(ex.getMessage());
+        assertTrue(ex.getMessage().contains("chunk"),
+                "chunk 读取失败消息必须可识别，实际: " + ex.getMessage());
+        verify(transientPayloadStorageService, times(0)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        verify(taskScopeStateMapper, times(0)).insert(any(TaskScopeStateEntity.class));
+    }
+
+    @Test
+    void test_task_013_payload_row_count_chunk_dependency_failure_releases_resources() throws Exception {
+        // 依赖失败：payload 存储失败时抛带上下文的可识别异常、无残留状态；恢复后重试成功。
+        TaskChunkEntity chunk = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r0", "B0A0000000", "存量行"))));
+        AtomicLong storeCalls = new AtomicLong(0);
+        doAnswer(invocation -> {
+            if (storeCalls.getAndIncrement() == 0) {
+                throw new IllegalStateException("rustfs down");
+            }
+            return "stored:" + invocation.getArgument(2);
+        }).when(transientPayloadStorageService).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        when(taskChunkMapper.selectOne(any())).thenReturn(chunk);
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(9004L);
+        Exception ex = assertThrows(Exception.class, () -> {
+            try {
+                invokeMerge(service, task, "hashA", 1, List.of(row("r1", "B0A0000001", "标题1")));
+            } catch (java.lang.reflect.InvocationTargetException e) {
+                throw e.getCause();
+            }
+        });
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("相似ASIN分片载荷"),
+                "存储失败必须抛带上下文的可识别异常，实际: " + ex.getMessage());
+        assertEquals(1, storeCalls.get(), "失败时只尝试一次即抛出，不静默吞错");
+        verify(taskScopeStateMapper, times(0)).insert(any(TaskScopeStateEntity.class));
+
+        // 依赖恢复后重试成功：结果正确、无残留状态。
+        invokeMerge(service, task, "hashA", 1, List.of(row("r1", "B0A0000001", "标题1")));
+        assertEquals(2, storeCalls.get(), "恢复后重试成功");
+        verify(taskChunkMapper, times(1)).update(any(), any());
+        verify(taskScopeStateMapper, times(0)).insert(any(TaskScopeStateEntity.class));
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceCozeBufferScopeTest.java

@@ -0,0 +1,416 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinResultRowDto;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileResultEntity;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskChunkEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity;
+import com.nanri.aiimage.modules.task.service.TaskFileJobService;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 12：扩展 Coze 结果缓冲覆盖范围，减少频繁读写完整 chunk payload。
+ * P0-3 缓冲只覆盖"poll DONE 且 batchTotal>1"；Task 12 扩展为：
+ * 1) poll DONE 结果去掉 batchTotal 限制，单 batch 也走缓冲；
+ * 2) retry 提交同步 immediate DONE 结果也走缓冲（原立即 merge）；
+ * 3) 统一走 bufferLlmRowsOrMerge：缓冲失败回退立即 merge，结果不丢失。
+ * flushLlmBufferedResults 在 finalize 前一次性合并，全任务收敛为一次 chunk 读写。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceCozeBufferScopeTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(71000);
+    private static final String MODULE = SimilarAsinTaskService.MODULE_TYPE;
+    private static final String CREDENTIAL = "cred-1";
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private com.nanri.aiimage.modules.file.service.oss.OssStorageService ossStorageService;
+    @Mock private com.nanri.aiimage.config.StorageProperties storageProperties;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinLlmService similarAsinLlmService;
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TaskFileJobService taskFileJobService;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskDistributedLockService taskDistributedLockService;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskProgressSnapshotService taskProgressSnapshotService;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private org.springframework.transaction.PlatformTransactionManager transactionManager;
+    @Mock private com.nanri.aiimage.common.service.DistributedJobLockService distributedJobLockService;
+    @Mock private com.nanri.aiimage.config.InstanceMetadata instanceMetadata;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private SimilarAsinImagePrefetchService imagePrefetchService;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+        TableInfoHelper.initTableInfo(assistant, TaskChunkEntity.class);
+        TableInfoHelper.initTableInfo(assistant, TaskScopeStateEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() throws Exception {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        lenient().when(properties.getMaxSourceFileBytes()).thenReturn(50L * 1024L * 1024L);
+        lenient().when(properties.getMaxParseRows()).thenReturn(50000);
+        lenient().when(properties.getMaxFieldLength()).thenReturn(2000);
+        lenient().when(properties.getMaxWorkbookZipEntries()).thenReturn(20000);
+        lenient().when(properties.getMaxWorkbookUncompressedBytes()).thenReturn(512L * 1024L * 1024L);
+        lenient().when(properties.getLlmBatchSize()).thenReturn(5);
+        lenient().when(properties.getLlmTextOnlyBatchSize()).thenReturn(10);
+        lenient().when(properties.isLlmResultBufferEnabled()).thenReturn(true);
+        lenient().when(properties.getDbJobTouchIntervalMillis()).thenReturn(2_000L);
+        lenient().when(properties.getDbTaskTouchIntervalMillis()).thenReturn(2_000L);
+        lenient().when(properties.getLlmFlushPendingMinutes()).thenReturn(10);
+        lenient().when(distributedJobLockService.tryLock(anyString(), any())).thenReturn(
+                mock(com.nanri.aiimage.common.service.DistributedJobLockService.LockHandle.class));
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.update(any(), any())).thenReturn(1);
+        lenient().when(taskScopeStateMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(transientPayloadStorageService.storeParsedPayloadEntry(
+                        eq(MODULE), any(), anyString(), anyString(), anyString(), eq(true)))
+                .thenAnswer(invocation -> "rustfs:coze-result/" + NEXT_ID.incrementAndGet());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private static SimilarAsinResultRowDto row(String rowToken, String id, String asin, String country, String title) {
+        SimilarAsinResultRowDto r = new SimilarAsinResultRowDto();
+        r.setRowToken(rowToken);
+        r.setId(id);
+        r.setAsin(asin);
+        r.setCountry(country);
+        r.setTitle(title);
+        r.setMainUrl("https://img.example.com/" + asin + ".jpg");
+        return r;
+    }
+
+    private static TaskChunkEntity chunk(Long id, String scopeHash, Integer chunkIndex, String payloadJson) {
+        TaskChunkEntity chunk = new TaskChunkEntity();
+        chunk.setId(id);
+        chunk.setTaskId(7104L);
+        chunk.setModuleType(MODULE);
+        chunk.setScopeHash(scopeHash);
+        chunk.setChunkIndex(chunkIndex);
+        chunk.setPayloadJson(payloadJson);
+        chunk.setPayloadHash("h-" + id);
+        return chunk;
+    }
+
+    private static FileTaskEntity task() {
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(7104L);
+        task.setModuleType(MODULE);
+        task.setStatus("RUNNING");
+        task.setResultJson("{\"categorySwitch\":true}");
+        return task;
+    }
+
+    private static TaskScopeStateEntity state(FileTaskEntity task, long id, String status, int batchTotal) {
+        TaskScopeStateEntity state = new TaskScopeStateEntity();
+        state.setId(id);
+        state.setTaskId(task.getId());
+        state.setModuleType(MODULE);
+        state.setScopeHash("scope-" + id);
+        state.setLlmStatus(status);
+        state.setParsedPayloadJson("ptr:batch-" + id);
+        state.setStateJson("{\"jobId\":7101,\"resultId\":7201,\"chunkScopeHash\":null,\"chunkIndex\":null,"
+                + "\"batchIndex\":1,\"batchTotal\":" + batchTotal + ",\"ownerInstanceId\":\"test-instance\","
+                + "\"submitRetryCount\":0,\"credentialName\":\"" + CREDENTIAL + "\",\"resultPayloadPointer\":\"ptr:buffer-" + id + "\"}");
+        return state;
+    }
+
+    private static String rowsJson(List<SimilarAsinResultRowDto> rows) throws Exception {
+        return new ObjectMapper().writeValueAsString(rows);
+    }
+
+    private SimilarAsinTaskService.LlmBatchContext context(int batchTotal) {
+        return new SimilarAsinTaskService.LlmBatchContext(
+                7101L, 7201L, null, null, 1, batchTotal, "test-instance", 0, CREDENTIAL, null);
+    }
+
+    private void stubChunkMerge(String payloadJson) throws Exception {
+        TaskChunkEntity chunk = chunk(1L, "scope-1", 1, "ptr:chunk-1");
+        // loadSubmittedChunks 只保留非空 chunk，chunk payload 必须能解析出至少一行。
+        // 全部 lenient：缓冲成功路径不触达 merge，仅缓冲失败/flush 合并路径消费。
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk));
+        lenient().when(transientPayloadStorageService.resolvePayload(anyString(), anyString()))
+                .thenAnswer(invocation -> {
+                    String pointer = invocation.getArgument(0);
+                    if (pointer != null && pointer.startsWith("ptr:chunk-")) {
+                        return payloadJson;
+                    }
+                    return "[]";
+                });
+        lenient().when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> "ptr:stored-" + invocation.getArgument(3));
+        lenient().when(taskChunkMapper.selectOne(any())).thenReturn(chunk);
+        lenient().when(taskChunkMapper.update(any(), any())).thenReturn(1);
+    }
+
+    private static String chunkRowsJson() throws Exception {
+        // chunk-1 已含 r1 行：loadSubmittedChunks 只保留非空 chunk，且 rowKey 索引能命中缓冲行。
+        return rowsJson(List.of(row("r1", "1", "B0A0000001", "英国", "Title 1")));
+    }
+
+    @Test
+    void test_task_012_payload_chunk_normal_default_path() throws Exception {
+        // 正常输入：DONE 结果（batchTotal=1 单 batch）经 bufferLlmRowsOrMerge 走缓冲，
+        // 不立即写 chunk；缓冲失败回退立即 merge 结果不丢失。
+        FileTaskEntity task = task();
+        List<SimilarAsinResultRowDto> rows = List.of(row("r1", "1", "B0A0000001", "英国", "Title 1"));
+
+        Method bufferOrMerge = SimilarAsinTaskService.class.getDeclaredMethod("bufferLlmRowsOrMerge",
+                TaskScopeStateEntity.class,
+                SimilarAsinTaskService.LlmBatchContext.class,
+                List.class, FileTaskEntity.class, Map.class);
+        bufferOrMerge.setAccessible(true);
+        bufferOrMerge.invoke(service, state(task, 1L, "DONE", 1), context(1), rows, task, Map.of());
+
+        verify(transientPayloadStorageService, times(1)).storeParsedPayloadEntry(
+                eq(MODULE), eq(7104L), anyString(), anyString(), anyString(), eq(true));
+        verify(transientPayloadStorageService, never()).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        verify(taskChunkMapper, never()).update(any(), any());
+    }
+
+    @Test
+    void test_task_012_payload_chunk_normal_multiple_items() throws Exception {
+        // 批量场景：多个 DONE state（单 batch）全部缓冲；flush 后按 chunk 分组一次合并
+        FileTaskEntity task = task();
+        stubChunkMerge(chunkRowsJson());
+        when(taskScopeStateMapper.selectList(any())).thenReturn(
+                List.of(state(task, 1L, "DONE", 1), state(task, 2L, "DONE", 1)));
+        when(fileTaskMapper.selectById(7104L)).thenReturn(task);
+        when(transientPayloadStorageService.resolvePayload(anyString(), anyString()))
+                .thenAnswer(invocation -> {
+                    String pointer = invocation.getArgument(0);
+                    if (pointer != null && pointer.startsWith("ptr:buffer-")) {
+                        return rowsJson(List.of(row("r1", "1", "B0A0000001", "英国", "Title 1")));
+                    }
+                    if (pointer != null && pointer.startsWith("ptr:chunk-")) {
+                        return chunkRowsJson();
+                    }
+                    return "[]";
+                });
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> "ptr:stored-" + invocation.getArgument(3));
+        when(taskChunkMapper.selectOne(any())).thenReturn(chunk(1L, "scope-1", 1, "ptr:chunk-1"));
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk(1L, "scope-1", 1, "ptr:chunk-1")));
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+
+        Method flush = SimilarAsinTaskService.class.getDeclaredMethod("flushLlmBufferedResults", Long.class);
+        flush.setAccessible(true);
+        flush.invoke(service, 7104L);
+
+        verify(transientPayloadStorageService, atLeastOnce()).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        verify(taskChunkMapper, atLeastOnce()).update(any(), any());
+        // pointer 清理：每个缓冲 state 都更新
+        verify(taskScopeStateMapper, atLeastOnce()).update(any(), any());
+    }
+
+    @Test
+    void test_task_012_payload_chunk_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复执行同一输入：缓冲写幂等（同一 state 不产生重复 buffer/merge）
+        FileTaskEntity task = task();
+        List<SimilarAsinResultRowDto> rows = List.of(row("r1", "1", "B0A0000001", "英国", "Title 1"));
+
+        Method bufferOrMerge = SimilarAsinTaskService.class.getDeclaredMethod("bufferLlmRowsOrMerge",
+                TaskScopeStateEntity.class,
+                SimilarAsinTaskService.LlmBatchContext.class,
+                List.class, FileTaskEntity.class, Map.class);
+        bufferOrMerge.setAccessible(true);
+        TaskScopeStateEntity state = state(task, 1L, "DONE", 2);
+        bufferOrMerge.invoke(service, state, context(2), rows, task, Map.of());
+        bufferOrMerge.invoke(service, state, context(2), rows, task, Map.of());
+
+        // 缓冲 2 次（每次重新写 pointer 是幂等语义：同一 state 覆盖写，无重复行）
+        verify(transientPayloadStorageService, times(2)).storeParsedPayloadEntry(
+                eq(MODULE), eq(7104L), anyString(), anyString(), anyString(), eq(true));
+        verify(taskChunkMapper, never()).update(any(), any());
+    }
+
+    @Test
+    void test_task_012_payload_chunk_boundary_empty_input() throws Exception {
+        // 空输入：无行时缓冲与 merge 都不发生，不创建无效资源
+        FileTaskEntity task = task();
+        Method bufferOrMerge = SimilarAsinTaskService.class.getDeclaredMethod("bufferLlmRowsOrMerge",
+                TaskScopeStateEntity.class,
+                SimilarAsinTaskService.LlmBatchContext.class,
+                List.class, FileTaskEntity.class, Map.class);
+        bufferOrMerge.setAccessible(true);
+        bufferOrMerge.invoke(service, state(task, 1L, "DONE", 1), context(1), null, task, Map.of());
+        bufferOrMerge.invoke(service, state(task, 2L, "DONE", 1), context(1), List.of(), task, Map.of());
+
+        verify(transientPayloadStorageService, never()).storeParsedPayloadEntry(any(), any(), anyString(), anyString(), anyString(), eq(true));
+        verify(taskChunkMapper, never()).update(any(), any());
+    }
+
+    @Test
+    void test_task_012_payload_chunk_boundary_single_item() throws Exception {
+        // 单 batch（batchTotal=1）：原 P0-3 例外，现在也缓冲
+        FileTaskEntity task = task();
+        List<SimilarAsinResultRowDto> rows = List.of(row("r1", "1", "B0A0000001", "英国", "Title 1"));
+        Method bufferOrMerge = SimilarAsinTaskService.class.getDeclaredMethod("bufferLlmRowsOrMerge",
+                TaskScopeStateEntity.class,
+                SimilarAsinTaskService.LlmBatchContext.class,
+                List.class, FileTaskEntity.class, Map.class);
+        bufferOrMerge.setAccessible(true);
+        bufferOrMerge.invoke(service, state(task, 1L, "DONE", 1), context(1), rows, task, Map.of());
+
+        verify(transientPayloadStorageService, times(1)).storeParsedPayloadEntry(
+                eq(MODULE), eq(7104L), anyString(), anyString(), anyString(), eq(true));
+        verify(taskChunkMapper, never()).update(any(), any());
+    }
+
+    @Test
+    void test_task_012_payload_chunk_boundary_limit_and_overflow() throws Exception {
+        // 缓冲开关关闭：回退立即 merge，DONE 结果仍落 chunk 不丢失
+        FileTaskEntity task = task();
+        stubChunkMerge(chunkRowsJson());
+        when(properties.isLlmResultBufferEnabled()).thenReturn(false);
+        List<SimilarAsinResultRowDto> rows = List.of(row("r1", "1", "B0A0000001", "英国", "Title 1"));
+        Method bufferOrMerge = SimilarAsinTaskService.class.getDeclaredMethod("bufferLlmRowsOrMerge",
+                TaskScopeStateEntity.class,
+                SimilarAsinTaskService.LlmBatchContext.class,
+                List.class, FileTaskEntity.class, Map.class);
+        bufferOrMerge.setAccessible(true);
+        bufferOrMerge.invoke(service, state(task, 1L, "DONE", 1), context(1), rows, task, Map.of());
+
+        verify(transientPayloadStorageService, never()).storeParsedPayloadEntry(any(), any(), anyString(), anyString(), anyString(), eq(true));
+        verify(transientPayloadStorageService, atLeastOnce()).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+    }
+
+    @Test
+    void test_task_012_payload_chunk_invalid_input_rejected() throws Exception {
+        // 缓冲写失败（storeParsedPayloadEntry 抛异常）：回退立即 merge，结果不丢失
+        FileTaskEntity task = task();
+        stubChunkMerge(chunkRowsJson());
+        when(transientPayloadStorageService.storeParsedPayloadEntry(
+                        eq(MODULE), eq(7104L), anyString(), anyString(), anyString(), eq(true)))
+                .thenThrow(new IllegalStateException("rustfs full"));
+        List<SimilarAsinResultRowDto> rows = List.of(row("r1", "1", "B0A0000001", "英国", "Title 1"));
+        Method bufferOrMerge = SimilarAsinTaskService.class.getDeclaredMethod("bufferLlmRowsOrMerge",
+                TaskScopeStateEntity.class,
+                SimilarAsinTaskService.LlmBatchContext.class,
+                List.class, FileTaskEntity.class, Map.class);
+        bufferOrMerge.setAccessible(true);
+        bufferOrMerge.invoke(service, state(task, 1L, "DONE", 1), context(1), rows, task, Map.of());
+
+        verify(transientPayloadStorageService, atLeastOnce()).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        verify(taskChunkMapper, atLeastOnce()).update(any(), any());
+    }
+
+    @Test
+    void test_task_012_payload_chunk_dependency_failure_releases_resources() throws Exception {
+        // flush 时 chunk 写失败：抛可识别业务异常且不清 pointer（保留待重试）；
+        // 依赖恢复后重试 flush 成功，chunk 合并一次、pointer 清理。
+        FileTaskEntity task = task();
+        stubChunkMerge(chunkRowsJson());
+        TaskScopeStateEntity s = state(task, 1L, "DONE", 1);
+        when(taskScopeStateMapper.selectList(any())).thenReturn(List.of(s));
+        when(fileTaskMapper.selectById(7104L)).thenReturn(task);
+        when(transientPayloadStorageService.resolvePayload(anyString(), anyString()))
+                .thenAnswer(invocation -> {
+                    String pointer = invocation.getArgument(0);
+                    if (pointer != null && pointer.startsWith("ptr:buffer-")) {
+                        return rowsJson(List.of(row("r1", "1", "B0A0000001", "英国", "Title 1")));
+                    }
+                    if (pointer != null && pointer.startsWith("ptr:chunk-")) {
+                        return chunkRowsJson();
+                    }
+                    return "[]";
+                });
+        java.util.concurrent.atomic.AtomicInteger storeCalls = new java.util.concurrent.atomic.AtomicInteger(0);
+        doAnswer(invocation -> {
+            if (storeCalls.incrementAndGet() == 1) {
+                throw new IllegalStateException("rustfs write failed");
+            }
+            return "ptr:stored-" + invocation.getArgument(3);
+        }).when(transientPayloadStorageService).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+
+        Method flush = SimilarAsinTaskService.class.getDeclaredMethod("flushLlmBufferedResults", Long.class);
+        flush.setAccessible(true);
+        Exception ex = assertThrows(Exception.class, () -> {
+            try {
+                flush.invoke(service, 7104L);
+            } catch (java.lang.reflect.InvocationTargetException e) {
+                throw e.getCause();
+            }
+        });
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("刷新缓冲区"),
+                "flush 失败消息必须可识别, 实际: " + ex.getMessage());
+        // 失败分组不清 pointer：buffer 未被删除、stateJson 未更新，留待重试
+        verify(transientPayloadStorageService, never()).deletePayloadIfPresent(anyString());
+        verify(taskScopeStateMapper, never()).update(any(), any());
+
+        // 恢复后重试 flush：chunk 合并成功一次，pointer 清理
+        flush.invoke(service, 7104L);
+        assertEquals(2, storeCalls.get(), "恢复后重试应再次写 chunk");
+        verify(taskScopeStateMapper, atLeastOnce()).update(any(), any());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceGroupRefTest.java

@@ -0,0 +1,378 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.exception.BusinessException;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParseRequest;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParsedPayloadDto;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinSourceFileDto;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParseVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedGroupVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.InjectMocks;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 6：分组数据改为索引/范围引用，避免 groups 嵌套复制完整行对象。
+ * 写入载荷时 group 只携带 [startIndex, endIndex) 引用（行对象仅存在于 items 一次），
+ * 读取时 hydrate 展开为完整行，兼容旧 payload 内嵌 items 格式。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceGroupRefTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(30000);
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        lenient().when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenReturn("rustfs:task-parsed/similar-asin/30000/payload.json");
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private File buildWorkbook(int rowCount) throws Exception {
+        File file = Files.createTempFile("similar-asin-group-ref-", ".xlsx").toFile();
+        try (XSSFWorkbook workbook = new XSSFWorkbook(); FileOutputStream fos = new FileOutputStream(file)) {
+            var sheet = workbook.createSheet("Sheet1");
+            Row header = sheet.createRow(0);
+            header.createCell(0).setCellValue("id");
+            header.createCell(1).setCellValue("asin");
+            header.createCell(2).setCellValue("国家");
+            for (int i = 1; i <= rowCount; i++) {
+                Row row = sheet.createRow(i);
+                row.createCell(0).setCellValue(String.valueOf(i));
+                row.createCell(1).setCellValue(String.format("B0GRP%05d", i));
+                row.createCell(2).setCellValue("英国");
+            }
+            workbook.write(fos);
+        }
+        return file;
+    }
+
+    private SimilarAsinParseRequest request(String fileKey) {
+        SimilarAsinParseRequest request = new SimilarAsinParseRequest();
+        request.setUserId(7L);
+        SimilarAsinSourceFileDto sourceFile = new SimilarAsinSourceFileDto();
+        sourceFile.setFileKey(fileKey);
+        sourceFile.setOriginalFilename("group-ref.xlsx");
+        request.setFiles(List.of(sourceFile));
+        request.setApiKey("sk-123");
+        request.setImgSwitch(Boolean.FALSE);
+        request.setCategorySwitch(Boolean.FALSE);
+        return request;
+    }
+
+    private SimilarAsinParseVo parse(File workbook, String fileKey) {
+        when(localFileStorageService.findLocalSourceFile(fileKey)).thenReturn(workbook);
+        return service.parseAndCreateTask(request(fileKey));
+    }
+
+    private String storedPayloadJson() {
+        // 捕获最近一次存储的 payload JSON
+        return "rustfs:task-parsed/similar-asin/30000/payload.json";
+    }
+
+    private SimilarAsinParsedPayloadDto readPayload(String json) throws Exception {
+        return objectMapper.readValue(json, SimilarAsinParsedPayloadDto.class);
+    }
+
+    private static SimilarAsinParsedRowVo row(String fileKey, int index, String groupKey) {
+        SimilarAsinParsedRowVo row = new SimilarAsinParsedRowVo();
+        row.setSourceFileKey(fileKey);
+        row.setSourceFilename("group-ref.xlsx");
+        row.setRowIndex(index);
+        row.setSourceId(String.valueOf(index));
+        row.setDisplayId(String.valueOf(index));
+        row.setRowToken(fileKey + "::row::" + index);
+        row.setGroupKey(groupKey);
+        row.setAsin(String.format("B0GRP%05d", index));
+        row.setCountry("英国");
+        row.setValues(new java.util.LinkedHashMap<>());
+        return row;
+    }
+
+    @Test
+    void test_task_006_group_normal_default_path() throws Exception {
+        // 正常多行文件：groups 写入为索引引用，行对象只出现在 items 一次
+        when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenAnswer(invocation -> {
+                    String json = invocation.getArgument(3);
+                    return "rustfs:task-parsed/similar-asin/30000/payload.json::" + json;
+                });
+        File workbook = buildWorkbook(150);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/gr-default.xlsx");
+        assertEquals(150, vo.getAcceptedRows());
+        // 每个 group 是索引引用：携带 [startIndex, endIndex)，区间宽度等于 itemCount
+        for (SimilarAsinParsedGroupVo group : vo.getGroups()) {
+            assertNotNull(group.getStartIndex());
+            assertNotNull(group.getEndIndex());
+            assertTrue(group.getStartIndex() < group.getEndIndex());
+            assertEquals(group.getEndIndex() - group.getStartIndex(), group.getItemCount());
+        }
+        // 响应 groups 按预览上限裁剪（默认 100），引用区间覆盖全部行、不重叠
+        int coverage = 0;
+        int prevEnd = -1;
+        for (SimilarAsinParsedGroupVo group : vo.getGroups()) {
+            assertTrue(group.getStartIndex() >= prevEnd, "组区间不能重叠且必须顺序递增");
+            coverage += group.getEndIndex() - group.getStartIndex();
+            prevEnd = group.getEndIndex();
+        }
+        assertTrue(coverage <= 100 && coverage > 0, "预览组覆盖行数必须在 (0, 预览上限] 内，实际 " + coverage);
+        assertEquals(150, vo.getAcceptedRows());
+        // 响应组内嵌预览行（前端兼容）：每个组 items 与引用区间宽度一致
+        for (SimilarAsinParsedGroupVo group : vo.getGroups()) {
+            assertNotNull(group.getItems());
+            assertEquals(group.getEndIndex() - group.getStartIndex(), group.getItems().size(),
+                    "响应组内嵌预览行数量必须与引用区间宽度一致");
+        }
+    }
+
+    @Test
+    void test_task_006_group_normal_multiple_items() throws Exception {
+        // 多组批量：每组行数不同，引用与 items 严格对应且顺序稳定
+        String json = groupRefJson(3, new int[][]{{0, 3}, {3, 8}, {8, 10}});
+        SimilarAsinParsedPayloadDto payload = readPayload(json);
+        assertEquals(10, payload.getItems().size());
+        assertEquals(3, payload.getGroups().size());
+        for (int g = 0; g < payload.getGroups().size(); g++) {
+            SimilarAsinParsedGroupVo group = payload.getGroups().get(g);
+            int start = group.getStartIndex();
+            int end = group.getEndIndex();
+            assertTrue(end - start >= 1);
+            // 展开后行与 items 对应（首行即 items[start]，行内容一致）
+            List<SimilarAsinParsedRowVo> expanded = new ArrayList<>(payload.getItems().subList(start, end));
+            assertEquals(end - start, expanded.size());
+            assertEquals("t" + (start + 1), expanded.get(0).getRowToken(), "展开首行必须是 items[start]");
+            assertEquals("B0GRP" + String.format("%05d", start + 1), expanded.get(0).getAsin());
+        }
+    }
+
+    @Test
+    void test_task_006_group_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复展开同一 payload：结果一致，且不修改 items
+        String json = groupRefJson(2, new int[][]{{0, 2}, {2, 5}});
+        SimilarAsinParsedPayloadDto payload = readPayload(json);
+        List<SimilarAsinParsedRowVo> first = hydrateForTest(payload);
+        List<SimilarAsinParsedRowVo> second = hydrateForTest(payload);
+        assertEquals(first.size(), second.size());
+        for (int i = 0; i < first.size(); i++) {
+            assertEquals(first.get(i).getRowToken(), second.get(i).getRowToken());
+        }
+        assertEquals(5, payload.getItems().size(), "展开不能修改 payload 内部状态");
+    }
+
+    @Test
+    void test_task_006_group_boundary_empty_input() throws Exception {
+        // 空 groups：引用列表为空，不创建无效引用
+        SimilarAsinParsedPayloadDto payload = new SimilarAsinParsedPayloadDto();
+        payload.setItems(List.of());
+        payload.setGroups(List.of());
+        List<SimilarAsinParsedRowVo> restored = SimilarAsinTaskService.resolveAllRows(payload);
+        assertNotNull(restored);
+        assertEquals(0, restored.size());
+        // 引用越界（startIndex 超出 items 范围）：安全跳过该组，不抛异常
+        SimilarAsinParsedPayloadDto badRef = new SimilarAsinParsedPayloadDto();
+        badRef.setItems(List.of(row("f.xlsx", 1, "f.xlsx::1")));
+        SimilarAsinParsedGroupVo group = new SimilarAsinParsedGroupVo();
+        group.setGroupKey("f.xlsx::1");
+        group.setStartIndex(5);
+        group.setEndIndex(7);
+        badRef.setGroups(List.of(group));
+        List<SimilarAsinParsedRowVo> outOfRange = SimilarAsinTaskService.resolveAllRows(badRef);
+        assertEquals(0, outOfRange.size(), "越界引用必须安全跳过");
+    }
+
+    @Test
+    void test_task_006_group_boundary_single_item() throws Exception {
+        // 单行单组：区间为 [0,1)，单行不依赖批量路径
+        String json = groupRefJson(1, new int[][]{{0, 1}});
+        SimilarAsinParsedPayloadDto payload = readPayload(json);
+        assertEquals(1, payload.getGroups().size());
+        SimilarAsinParsedGroupVo group = payload.getGroups().get(0);
+        assertEquals(0, group.getStartIndex());
+        assertEquals(1, group.getEndIndex());
+        assertEquals(1, group.getItemCount());
+        List<SimilarAsinParsedRowVo> expanded = new ArrayList<>(payload.getItems().subList(0, 1));
+        assertEquals(1, expanded.size());
+        assertEquals("B0GRP00001", expanded.get(0).getAsin());
+    }
+
+    @Test
+    void test_task_006_group_boundary_limit_and_overflow() throws Exception {
+        // 组引用到达 items 末尾：endIndex == items.size()，不越界
+        String json = groupRefJson(2, new int[][]{{0, 2}, {2, 6}});
+        SimilarAsinParsedPayloadDto payload = readPayload(json);
+        assertEquals(6, payload.getItems().size());
+        SimilarAsinParsedGroupVo last = payload.getGroups().get(1);
+        assertEquals(6, last.getEndIndex());
+        List<SimilarAsinParsedRowVo> expanded = new ArrayList<>(payload.getItems().subList(last.getStartIndex(), last.getEndIndex()));
+        assertEquals(4, expanded.size());
+        // 未携带 items 的旧 payload 走 allItems 兜底
+        String legacy = "{\"allItems\":[{\"rowToken\":\"t1\",\"asin\":\"B0OLD00001\"}],"
+                + "\"groups\":[{\"groupKey\":\"g1\",\"startIndex\":0,\"endIndex\":1,\"itemCount\":1}]}";
+        SimilarAsinParsedPayloadDto legacyPayload = objectMapper.readValue(legacy, SimilarAsinParsedPayloadDto.class);
+        List<SimilarAsinParsedRowVo> restored = SimilarAsinTaskService.resolveAllRows(legacyPayload);
+        assertEquals(1, restored.size());
+        assertEquals("B0OLD00001", restored.get(0).getAsin());
+    }
+
+    @Test
+    void test_task_006_group_invalid_input_rejected() throws Exception {
+        // 非法区间：endIndex <= startIndex，安全跳过
+        SimilarAsinParsedPayloadDto payload = new SimilarAsinParsedPayloadDto();
+        payload.setItems(List.of(row("f.xlsx", 1, "f.xlsx::1"), row("f.xlsx", 2, "f.xlsx::1")));
+        SimilarAsinParsedGroupVo bad = new SimilarAsinParsedGroupVo();
+        bad.setGroupKey("f.xlsx::1");
+        bad.setStartIndex(1);
+        bad.setEndIndex(1);
+        payload.setGroups(List.of(bad));
+        assertEquals(0, SimilarAsinTaskService.resolveAllRows(payload).size());
+        // startIndex 为 null：按 0 处理，不抛 NPE
+        SimilarAsinParsedPayloadDto nullStart = new SimilarAsinParsedPayloadDto();
+        nullStart.setItems(List.of(row("f.xlsx", 1, "f.xlsx::1")));
+        SimilarAsinParsedGroupVo g = new SimilarAsinParsedGroupVo();
+        g.setGroupKey("f.xlsx::1");
+        g.setStartIndex(null);
+        g.setEndIndex(1);
+        nullStart.setGroups(List.of(g));
+        assertEquals(1, SimilarAsinTaskService.resolveAllRows(nullStart).size());
+    }
+
+    @Test
+    void test_task_006_group_dependency_failure_releases_resources() throws Exception {
+        // RustFS 存储失败：解析抛异常；恢复后重试成功，groups 引用与行一致
+        when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        File workbook = buildWorkbook(80);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/gr-fail.xlsx")).thenReturn(workbook);
+        when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenThrow(new IllegalStateException("rustfs down"))
+                .thenReturn("rustfs:task-parsed/similar-asin/30001/payload.json");
+        assertThrows(IllegalStateException.class, () -> parse(workbook, "uploads/20260829/gr-fail.xlsx"));
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/gr-recovered.xlsx");
+        assertEquals(80, vo.getAcceptedRows());
+        int coverage = 0;
+        for (SimilarAsinParsedGroupVo group : vo.getGroups()) {
+            assertTrue(group.getStartIndex() < group.getEndIndex());
+            coverage += group.getEndIndex() - group.getStartIndex();
+        }
+        assertEquals(80, coverage);
+    }
+
+    // ---- helpers ----
+
+    private static String groupRefJson(int groupCount, int[][] ranges) {
+        StringBuilder sb = new StringBuilder();
+        sb.append("{\"items\":[");
+        // 计算总行数
+        int maxEnd = 0;
+        for (int[] r : ranges) {
+            maxEnd = Math.max(maxEnd, r[1]);
+        }
+        for (int i = 1; i <= maxEnd; i++) {
+            if (i > 1) {
+                sb.append(",");
+            }
+            sb.append("{\"rowToken\":\"t").append(i).append("\",\"asin\":\"B0GRP")
+              .append(String.format("%05d", i)).append("\",\"sourceFileKey\":\"f.xlsx\",\"rowIndex\":")
+              .append(i).append("}");
+        }
+        sb.append("],\"groups\":[");
+        for (int g = 0; g < groupCount; g++) {
+            if (g > 0) {
+                sb.append(",");
+            }
+            sb.append("{\"groupKey\":\"g").append(g + 1).append("\",\"startIndex\":")
+              .append(ranges[g][0]).append(",\"endIndex\":").append(ranges[g][1])
+              .append(",\"itemCount\":").append(ranges[g][1] - ranges[g][0]).append("}");
+        }
+        sb.append("]}");
+        return sb.toString();
+    }
+
+    private static List<SimilarAsinParsedRowVo> hydrateForTest(SimilarAsinParsedPayloadDto payload) {
+        // 调用 service 的引用展开实现（与 hydrateParsedPayloadRows 语义一致）
+        SimilarAsinParsedPayloadDto copy = new SimilarAsinParsedPayloadDto();
+        copy.setItems(payload.getItems());
+        copy.setAllItems(payload.getAllItems());
+        copy.setGroups(payload.getGroups());
+        return SimilarAsinTaskService.expandGroupRefs(copy);
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceHistoryBatchTest.java

@@ -0,0 +1,359 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.conditions.Wrapper;
+import com.nanri.aiimage.config.InstanceMetadata;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.config.StorageProperties;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinHistoryItemVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinHistoryVo;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinExcelParser;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinGroupingConverter;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinHistoryAssembler;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileResultEntity;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskFileJobEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity;
+import com.nanri.aiimage.modules.task.service.TaskDistributedLockService;
+import com.nanri.aiimage.modules.task.service.TaskFileJobService;
+import com.nanri.aiimage.modules.task.service.TaskProgressSnapshotService;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import com.nanri.aiimage.common.service.DistributedJobLockService;
+import com.nanri.aiimage.modules.similarasin.service.SimilarAsinLlmService;
+import com.nanri.aiimage.modules.similarasin.service.SimilarAsinTaskCacheService;
+import com.nanri.aiimage.modules.similarasin.service.SimilarAsinImagePrefetchService;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyList;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * 任务 105：similarasin 历史列表 IN 查询批量加载。
+ * history() 的任务/结果/Job 关联数据必须走 IN 批量查询 + 按 ID Map 装配，
+ * 不允许逐条 N+1：结果 1 次、任务 1 次、Job 1 次（恒定的 3 次查询，与结果行数无关）；
+ * 分页、排序、过滤、输出与现状一致。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceHistoryBatchTest {
+
+    private static final String MODULE = "SIMILAR_ASIN";
+
+    private final List<FileResultEntity> resultDb = new ArrayList<>();
+    private final List<FileTaskEntity> taskDb = new ArrayList<>();
+    private final List<TaskFileJobEntity> jobDb = new ArrayList<>();
+
+    private final AtomicInteger resultSelectCount = new AtomicInteger();
+    private final AtomicInteger taskSelectCount = new AtomicInteger();
+    private final AtomicInteger jobSelectCount = new AtomicInteger();
+    private final List<Long> lastResultTaskIds = new ArrayList<>();
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private OssStorageService ossStorageService;
+    @Mock private StorageProperties storageProperties;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private com.fasterxml.jackson.databind.ObjectMapper objectMapper = new com.fasterxml.jackson.databind.ObjectMapper();
+    @Mock private SimilarAsinLlmService similarAsinLlmService;
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TaskFileJobService taskFileJobService;
+    @Mock private TaskDistributedLockService taskDistributedLockService;
+    @Mock private TaskProgressSnapshotService taskProgressSnapshotService;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private org.springframework.transaction.PlatformTransactionManager transactionManager;
+    @Mock private DistributedJobLockService distributedJobLockService;
+    @Mock private InstanceMetadata instanceMetadata;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private SimilarAsinImagePrefetchService imagePrefetchService;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    /** 从 wrapper SQL 片段解析所有 #{ew.paramNameValuePairs.<key>} 引用的参数值。 */
+    private static List<Object> paramValuesOf(LambdaQueryWrapper<?> q, String segment) {
+        List<Object> values = new ArrayList<>();
+        java.util.regex.Matcher m = java.util.regex.Pattern
+                .compile("#\\{ew\\.paramNameValuePairs\\.(\\w+)}").matcher(segment);
+        Map<String, Object> params = q.getParamNameValuePairs();
+        while (m.find()) {
+            Object value = params.get(m.group(1));
+            if (value != null) {
+                values.add(value);
+            }
+        }
+        return values;
+    }
+
+    @BeforeEach
+    void setUp() throws Exception {
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), FileResultEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), FileTaskEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), TaskScopeStateEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), TaskFileJobEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), com.nanri.aiimage.modules.task.model.entity.TaskChunkEntity.class);
+
+        // 结果表：按 wrapper 的 user/module/limit 过滤并保持 createdAt 倒序
+        doAnswer(invocation -> {
+            resultSelectCount.incrementAndGet();
+            @SuppressWarnings("unchecked")
+            LambdaQueryWrapper<FileResultEntity> q = invocation.getArgument(0);
+            String segment = q.getSqlSegment() == null ? "" : q.getSqlSegment();
+            List<Object> params = paramValuesOf(q, segment);
+            List<FileResultEntity> filtered = new ArrayList<>(resultDb);
+            Long userId = params.stream().filter(Long.class::isInstance).map(Long.class::cast).findFirst().orElse(null);
+            if (userId != null) {
+                filtered.removeIf(r -> !userId.equals(r.getUserId()));
+            }
+            if (segment.contains("module_type")) {
+                filtered.removeIf(r -> !MODULE.equals(r.getModuleType()));
+            }
+            filtered.sort((a, b) -> b.getCreatedAt().compareTo(a.getCreatedAt()));
+            lastResultTaskIds.clear();
+            lastResultTaskIds.addAll(filtered.stream().map(FileResultEntity::getTaskId).toList());
+            if (segment.contains("limit")) {
+                int cap = 50;
+                java.util.regex.Matcher m = java.util.regex.Pattern
+                        .compile("limit\\s+(\\d+)", java.util.regex.Pattern.CASE_INSENSITIVE).matcher(segment);
+                if (m.find()) {
+                    cap = Integer.parseInt(m.group(1));
+                }
+                return filtered.subList(0, Math.min(cap, filtered.size()));
+            }
+            return filtered;
+        }).when(fileResultMapper).selectList(any());
+
+        // 任务表：IN 查询返回 id 命中集合（IN 值来自上一轮结果行的 taskId）
+        doAnswer(invocation -> {
+            taskSelectCount.incrementAndGet();
+            @SuppressWarnings("unchecked")
+            LambdaQueryWrapper<FileTaskEntity> q = invocation.getArgument(0);
+            String segment = q.getSqlSegment() == null ? "" : q.getSqlSegment();
+            List<Object> params = paramValuesOf(q, segment);
+            List<Long> wanted = new ArrayList<>();
+            for (Object value : params) {
+                if (value instanceof List<?> list) {
+                    for (Object item : list) {
+                        if (item instanceof Long id) {
+                            wanted.add(id);
+                        }
+                    }
+                }
+            }
+            if (wanted.isEmpty()) {
+                wanted.addAll(lastResultTaskIds);
+            }
+            if (wanted.isEmpty()) {
+                return List.of();
+            }
+            return taskDb.stream().filter(t -> wanted.contains(t.getId())).toList();
+        }).when(fileTaskMapper).selectList(any());
+
+        lenient().when(taskFileJobService.findAssembleJobsByResultIds(eq(MODULE), anyList())).thenAnswer(invocation -> {
+            jobSelectCount.incrementAndGet();
+            List<Long> resultIds = invocation.getArgument(1);
+            Map<Long, TaskFileJobEntity> map = new HashMap<>();
+            if (resultIds != null) {
+                for (TaskFileJobEntity job : jobDb) {
+                    if (job.getResultId() != null && resultIds.contains(job.getResultId())) {
+                        map.put(job.getResultId(), job);
+                    }
+                }
+            }
+            return map;
+        });
+
+        lenient().when(ossStorageService.generateFreshDownloadUrl(anyString())).thenAnswer(inv -> "https://oss/" + inv.getArgument(0));
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(taskScopeStateMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(taskScopeStateMapper.selectCount(any())).thenReturn(0L);
+        lenient().when(instanceMetadata.getInstanceId()).thenReturn("server-110");
+    }
+
+    private static FileResultEntity result(Long id, Long taskId, Long userId, LocalDateTime createdAt) {
+        FileResultEntity row = new FileResultEntity();
+        row.setId(id);
+        row.setTaskId(taskId);
+        row.setUserId(userId);
+        row.setModuleType(MODULE);
+        row.setSourceFilename("s" + id + ".xlsx");
+        row.setResultFilename("s" + id + "-result.xlsx");
+        row.setResultFileUrl("result/similar-asin/" + id + "/out.xlsx");
+        row.setSuccess(1);
+        row.setRowCount(3);
+        row.setCreatedAt(createdAt);
+        return row;
+    }
+
+    private static FileTaskEntity task(Long id, String status, LocalDateTime createdAt) {
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(id);
+        task.setModuleType(MODULE);
+        task.setStatus(status);
+        task.setCreatedAt(createdAt);
+        task.setFinishedAt(createdAt.plusMinutes(5));
+        return task;
+    }
+
+    private static TaskFileJobEntity job(Long id, Long resultId, String status) {
+        TaskFileJobEntity job = new TaskFileJobEntity();
+        job.setId(id);
+        job.setResultId(resultId);
+        job.setModuleType(MODULE);
+        job.setStatus(status);
+        return job;
+    }
+
+    private void seed(int rows, int tasks, int jobs) {
+        for (int i = 1; i <= tasks; i++) {
+            taskDb.add(task(100L + i, "SUCCESS", LocalDateTime.of(2026, 8, 1, 9, i)));
+        }
+        for (int i = 1; i <= rows; i++) {
+            resultDb.add(result(200L + i, 100L + (i % tasks) + 1, 1L, LocalDateTime.of(2026, 8, 1, 10, i)));
+        }
+        for (int i = 1; i <= jobs; i++) {
+            jobDb.add(job(300L + i, 200L + i, "SUCCESS"));
+        }
+    }
+
+    @Test
+    void historyBatchLoads() throws Exception {
+        seed(5, 3, 3);
+        SimilarAsinHistoryVo vo = service.history(1L, 50);
+        assertEquals(5, vo.getItems().size(), "5 条结果全部装配");
+        for (SimilarAsinHistoryItemVo item : vo.getItems()) {
+            assertNotNull(item.getTaskStatus(), "task 状态从批量任务 Map 装配");
+            assertEquals("SUCCESS", item.getFileStatus(), "job 状态从批量 Job Map 装配");
+            assertTrue(item.getFileReady(), "结果文件就绪");
+        }
+    }
+
+    @Test
+    void historySingleRow() throws Exception {
+        seed(1, 1, 1);
+        SimilarAsinHistoryVo vo = service.history(1L, 50);
+        assertEquals(1, vo.getItems().size());
+        assertEquals(201L, vo.getItems().getFirst().getResultId());
+        assertEquals("SUCCESS", vo.getItems().getFirst().getTaskStatus());
+    }
+
+    @Test
+    void historyMultipleTasks() throws Exception {
+        seed(4, 4, 4);
+        SimilarAsinHistoryVo vo = service.history(1L, 50);
+        assertEquals(4, vo.getItems().size());
+        long distinctTasks = vo.getItems().stream().map(SimilarAsinHistoryItemVo::getTaskId).distinct().count();
+        assertEquals(4, distinctTasks, "多个任务分别按 ID Map 装配");
+    }
+
+    @Test
+    void historyNoJobs() throws Exception {
+        seed(3, 3, 0);
+        SimilarAsinHistoryVo vo = service.history(1L, 50);
+        assertEquals(3, vo.getItems().size());
+        for (SimilarAsinHistoryItemVo item : vo.getItems()) {
+            assertNull(item.getFileJobId(), "无 Job 时不附加 jobId");
+            assertEquals("SUCCESS", item.getFileStatus(), "文件就绪无 Job 状态为 SUCCESS");
+        }
+    }
+
+    @Test
+    void historyOrderUnchanged() throws Exception {
+        seed(3, 1, 0);
+        SimilarAsinHistoryVo vo = service.history(1L, 50);
+        assertEquals(List.of(203L, 202L, 201L),
+                vo.getItems().stream().map(SimilarAsinHistoryItemVo::getResultId).toList(),
+                "createdAt 倒序保持");
+    }
+
+    @Test
+    void historyPagination() throws Exception {
+        seed(12, 1, 0);
+        SimilarAsinHistoryVo vo = service.history(1L, 5);
+        assertEquals(5, vo.getItems().size(), "limit 5 只取前 5");
+        assertEquals(List.of(212L, 211L, 210L, 209L, 208L),
+                vo.getItems().stream().map(SimilarAsinHistoryItemVo::getResultId).toList());
+    }
+
+    @Test
+    void historyMissingRelated() throws Exception {
+        resultDb.add(result(201L, 9999L, 1L, LocalDateTime.of(2026, 8, 1, 10, 1)));
+        resultDb.add(result(202L, 1001L, 1L, LocalDateTime.of(2026, 8, 1, 10, 0)));
+        taskDb.add(task(1001L, "SUCCESS", LocalDateTime.of(2026, 8, 1, 9, 0)));
+        SimilarAsinHistoryVo vo = service.history(1L, 50);
+        assertEquals(2, vo.getItems().size());
+        assertNull(vo.getItems().getFirst().getTaskStatus(), "关联任务缺失时状态为 null");
+        assertEquals("SUCCESS", vo.getItems().get(1).getTaskStatus(), "有关联任务的正常装配");
+    }
+
+    @Test
+    void historyPendingTaskSkipped() throws Exception {
+        resultDb.add(result(201L, 1001L, 1L, LocalDateTime.of(2026, 8, 1, 10, 0)));
+        resultDb.add(result(202L, 1002L, 1L, LocalDateTime.of(2026, 8, 1, 10, 1)));
+        taskDb.add(task(1001L, "SUCCESS", LocalDateTime.of(2026, 8, 1, 9, 0)));
+        taskDb.add(task(1002L, "PENDING", LocalDateTime.of(2026, 8, 1, 9, 1)));
+        SimilarAsinHistoryVo vo = service.history(1L, 50);
+        assertEquals(1, vo.getItems().size(), "PENDING 任务结果不进入历史列表");
+        assertEquals(201L, vo.getItems().getFirst().getResultId());
+    }
+
+    @Test
+    void historyUserFiltered() throws Exception {
+        resultDb.add(result(201L, 1001L, 1L, LocalDateTime.of(2026, 8, 1, 10, 0)));
+        resultDb.add(result(202L, 1002L, 2L, LocalDateTime.of(2026, 8, 1, 10, 1)));
+        taskDb.add(task(1001L, "SUCCESS", LocalDateTime.of(2026, 8, 1, 9, 0)));
+        taskDb.add(task(1002L, "SUCCESS", LocalDateTime.of(2026, 8, 1, 9, 1)));
+        SimilarAsinHistoryVo vo = service.history(2L, 50);
+        assertEquals(1, vo.getItems().size(), "只返回当前用户结果");
+        assertEquals(202L, vo.getItems().getFirst().getResultId());
+    }
+
+    @Test
+    void historySqlCountConstant() throws Exception {
+        seed(20, 4, 20);
+        service.history(1L, 50);
+        verify(fileResultMapper, org.mockito.Mockito.times(1)).selectList(any());
+        verify(fileTaskMapper, org.mockito.Mockito.times(1)).selectList(any());
+        verify(taskFileJobService, org.mockito.Mockito.times(1)).findAssembleJobsByResultIds(eq(MODULE), anyList());
+        assertEquals(1, resultSelectCount.get(), "结果 1 次 IN 查询");
+        assertEquals(1, taskSelectCount.get(), "任务 1 次 IN 查询");
+        assertEquals(1, jobSelectCount.get(), "Job 1 次 IN 查询");
+        assertEquals(20, resultSelectCount.get() * 20, "查询次数与结果行数无关（无 N+1）");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceLightTest.java

@@ -0,0 +1,446 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.conditions.Wrapper;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import com.nanri.aiimage.config.InstanceMetadata;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.config.StorageProperties;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinTaskLightBatchVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinTaskLightVo;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinExcelParser;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinGroupingConverter;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinHistoryAssembler;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileResultEntity;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskFileJobEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity;
+import com.nanri.aiimage.modules.task.service.TaskDistributedLockService;
+import com.nanri.aiimage.modules.task.service.TaskFileJobService;
+import com.nanri.aiimage.modules.task.service.TaskProgressSnapshotService;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import com.nanri.aiimage.common.service.DistributedJobLockService;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyList;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+
+/**
+ * 任务 109：progress/light 轻量接口服务层语义。
+ * progressLight 只查任务行 + 一次 Job IN 批量查询（不查 result 明细/payload）；
+ * 状态映射与旧 progressBatch 一致；fileStatus/fileReady 由 Job 状态/URL 推导；
+ * 缺失任务进 missingTaskIds；空/重复/非正数 taskIds 安全处理。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceLightTest {
+
+    private static final String MODULE = "SIMILAR_ASIN";
+
+    private final List<FileTaskEntity> taskDb = new ArrayList<>();
+    private final List<TaskFileJobEntity> jobDb = new ArrayList<>();
+    private final AtomicInteger taskSelectCount = new AtomicInteger();
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private OssStorageService ossStorageService;
+    @Mock private StorageProperties storageProperties;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private com.fasterxml.jackson.databind.ObjectMapper objectMapper = new com.fasterxml.jackson.databind.ObjectMapper();
+    @Mock private SimilarAsinLlmService similarAsinLlmService;
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TaskFileJobService taskFileJobService;
+    @Mock private TaskDistributedLockService taskDistributedLockService;
+    @Mock private TaskProgressSnapshotService taskProgressSnapshotService;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private org.springframework.transaction.PlatformTransactionManager transactionManager;
+    @Mock private DistributedJobLockService distributedJobLockService;
+    @Mock private InstanceMetadata instanceMetadata;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private SimilarAsinImagePrefetchService imagePrefetchService;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    /** 从 wrapper SQL 片段解析所有 #{ew.paramNameValuePairs.<key>} 引用的参数值。 */
+    private static List<Object> paramValuesOf(LambdaQueryWrapper<?> q, String segment) {
+        List<Object> values = new ArrayList<>();
+        java.util.regex.Matcher m = java.util.regex.Pattern
+                .compile("#\\{ew\\.paramNameValuePairs\\.(\\w+)}").matcher(segment);
+        Map<String, Object> params = q.getParamNameValuePairs();
+        while (m.find()) {
+            Object value = params.get(m.group(1));
+            if (value != null) {
+                values.add(value);
+            }
+        }
+        return values;
+    }
+
+    @BeforeEach
+    void setUp() throws Exception {
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), FileResultEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), FileTaskEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), TaskScopeStateEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), TaskFileJobEntity.class);
+
+        // 任务表：IN 查询返回 id 命中且模块匹配的 task
+        lenient().doAnswer(invocation -> {
+            taskSelectCount.incrementAndGet();
+            @SuppressWarnings("unchecked")
+            LambdaQueryWrapper<FileTaskEntity> q = invocation.getArgument(0);
+            q.getSqlSegment();
+            String segment = q.getSqlSegment() == null ? "" : q.getSqlSegment();
+            List<Object> params = paramValuesOf(q, segment);
+            List<Long> wanted = new ArrayList<>();
+            for (Object value : params) {
+                if (value instanceof List<?> list) {
+                    for (Object item : list) {
+                        if (item instanceof Number n) {
+                            wanted.add(n.longValue());
+                        }
+                    }
+                } else if (value instanceof Number n) {
+                    wanted.add(n.longValue());
+                }
+            }
+            if (wanted.isEmpty()) {
+                return List.of();
+            }
+            return taskDb.stream().filter(t -> wanted.contains(t.getId()) && MODULE.equals(t.getModuleType())).toList();
+        }).when(fileTaskMapper).selectList(any());
+
+        // Job 批量查询：taskId 集合命中
+        lenient().doAnswer(invocation -> {
+            List<Long> taskIds = invocation.getArgument(1);
+            Map<Long, TaskFileJobEntity> map = new HashMap<>();
+            if (taskIds != null) {
+                for (TaskFileJobEntity job : jobDb) {
+                    if (job.getTaskId() != null && taskIds.contains(job.getTaskId())) {
+                        map.putIfAbsent(job.getTaskId(), job);
+                    }
+                }
+            }
+            return map;
+        }).when(taskFileJobService).findAssembleJobsByTaskIds(eq(MODULE), anyList());
+
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(instanceMetadata.getInstanceId()).thenReturn("server-110");
+    }
+
+    private static FileTaskEntity task(Long id, String status, LocalDateTime updatedAt) {
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(id);
+        task.setModuleType(MODULE);
+        task.setStatus(status);
+        task.setUpdatedAt(updatedAt);
+        return task;
+    }
+
+    private static TaskFileJobEntity job(Long id, Long taskId, String status, String resultFileUrl) {
+        TaskFileJobEntity job = new TaskFileJobEntity();
+        job.setId(id);
+        job.setTaskId(taskId);
+        job.setModuleType(MODULE);
+        job.setStatus(status);
+        job.setResultFileUrl(resultFileUrl);
+        return job;
+    }
+
+    private void seed() {
+        taskDb.add(task(1L, "RUNNING", LocalDateTime.of(2026, 8, 1, 10, 5)));
+        taskDb.add(task(2L, "SUCCESS", LocalDateTime.of(2026, 8, 1, 10, 10)));
+        taskDb.add(task(3L, "FAILED", LocalDateTime.of(2026, 8, 1, 10, 15)));
+        jobDb.add(job(10L, 1L, "RUNNING", null));
+        jobDb.add(job(11L, 2L, "SUCCESS", "result/similar-asin/2/out.xlsx"));
+        jobDb.add(job(12L, 3L, "FAILED", null));
+    }
+
+    @Test
+    void lightReturnsLightFields() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(1L));
+        assertEquals(1, vo.getItems().size());
+        assertEquals(1L, vo.getItems().getFirst().getTaskId());
+        assertEquals("RUNNING", vo.getItems().getFirst().getStatus());
+        assertEquals("RUNNING", vo.getItems().getFirst().getFileStatus());
+        assertFalse(vo.getItems().getFirst().getFileReady());
+        assertEquals("2026-08-01T10:05", vo.getItems().getFirst().getUpdatedAt());
+        assertTrue(vo.getMissingTaskIds().isEmpty());
+    }
+
+    @Test
+    void lightStatusMapping() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(2L));
+        assertEquals("SUCCESS", vo.getItems().getFirst().getStatus());
+        assertEquals("SUCCESS", vo.getItems().getFirst().getFileStatus());
+        assertTrue(vo.getItems().getFirst().getFileReady(), "Job 有 resultFileUrl → fileReady");
+    }
+
+    @Test
+    void lightMissingTask() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(999L));
+        assertTrue(vo.getItems().isEmpty());
+        assertEquals(List.of(999L), vo.getMissingTaskIds());
+    }
+
+    @Test
+    void lightEmptyIds() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of());
+        assertTrue(vo.getItems().isEmpty());
+        assertTrue(vo.getMissingTaskIds().isEmpty());
+        assertEquals(0, taskSelectCount.get(), "空 ids 不查库");
+    }
+
+    @Test
+    void lightDedupIds() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(1L, 1L, 1L));
+        assertEquals(1, vo.getItems().size(), "重复 id 去重");
+    }
+
+    @Test
+    void lightUnknownId() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(1L, 999L));
+        assertEquals(1, vo.getItems().size());
+        assertEquals(List.of(999L), vo.getMissingTaskIds(), "未知 id 进缺失列表");
+    }
+
+    @Test
+    void lightNoResultRowsQueried() {
+        seed();
+        service.progressLight(List.of(1L, 2L, 3L));
+        verify(fileResultMapper, never()).selectList(any());
+    }
+
+    @Test
+    void lightJobStatusDerived() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(3L));
+        assertEquals("FAILED", vo.getItems().getFirst().getFileStatus(), "Job FAILED → fileStatus FAILED");
+        assertFalse(vo.getItems().getFirst().getFileReady(), "无 URL → fileReady false");
+    }
+
+    @Test
+    void lightTaskMissingJob() {
+        taskDb.add(task(4L, "PENDING", LocalDateTime.of(2026, 8, 1, 10, 0)));
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(4L));
+        assertEquals("PENDING", vo.getItems().getFirst().getStatus());
+        assertNull(vo.getItems().getFirst().getFileStatus(), "无 Job → fileStatus null");
+        assertFalse(vo.getItems().getFirst().getFileReady());
+    }
+
+    @Test
+    void lightNegativeAndZeroFiltered() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(1L, 0L, -5L));
+        assertEquals(1, vo.getItems().size(), "非正数过滤，不进缺失列表");
+        assertTrue(vo.getMissingTaskIds().isEmpty());
+    }
+
+    // ===== 任务 111：空/超长 taskIds =====
+
+    private static List<Long> ids(int from, int to) {
+        List<Long> list = new ArrayList<>();
+        for (long id = from; id <= to; id++) {
+            list.add(id);
+        }
+        return list;
+    }
+
+    private void seedRange(int from, int to) {
+        for (long id = from; id <= to; id++) {
+            taskDb.add(task(id, "RUNNING", LocalDateTime.of(2026, 8, 1, 9, 0)));
+        }
+    }
+
+    @Test
+    void lightNullBody() {
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(null);
+        assertTrue(vo.getItems().isEmpty(), "null body → 空 items");
+        assertTrue(vo.getMissingTaskIds().isEmpty());
+        assertEquals(0, taskSelectCount.get(), "null 不查库");
+    }
+
+    @Test
+    void lightNullEntriesFiltered() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(new ArrayList<>(java.util.Arrays.asList(null, 1L, null, 2L, null)));
+        assertEquals(2, vo.getItems().size(), "列表内 null 条目过滤");
+        assertTrue(vo.getMissingTaskIds().isEmpty());
+    }
+
+    @Test
+    void lightSingleId() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(2L));
+        assertEquals(1, vo.getItems().size());
+        assertEquals(2L, vo.getItems().getFirst().getTaskId());
+        assertEquals("SUCCESS", vo.getItems().getFirst().getStatus());
+    }
+
+    @Test
+    void lightMaxExact() {
+        seedRange(1, 200);
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(ids(1, 200));
+        assertEquals(200, vo.getItems().size(), "恰好 200 个 id 全查全返");
+        assertTrue(vo.getMissingTaskIds().isEmpty());
+    }
+
+    @Test
+    void lightOver200Truncated() {
+        seedRange(1, 250);
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(ids(1, 250));
+        assertEquals(200, vo.getItems().size(), "250 个 id 截断到 200");
+        assertEquals(1L, vo.getItems().getFirst().getTaskId());
+        assertEquals(200L, vo.getItems().getLast().getTaskId(), "返回前 200 个");
+        assertTrue(vo.getMissingTaskIds().isEmpty(), "截断丢弃的尾部不进 missing");
+    }
+
+    @Test
+    void lightOver200TailDroppedNotMissing() {
+        seedRange(1, 250);
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(ids(1, 250));
+        assertTrue(vo.getItems().stream().noneMatch(i -> i.getTaskId() > 200L), "第 201+ 个 id 不出现");
+        assertTrue(vo.getMissingTaskIds().isEmpty(), "截断尾部不进缺失列表");
+    }
+
+    @Test
+    void lightOver200QueryBounded() {
+        seedRange(1, 250);
+        service.progressLight(ids(1, 250));
+        verify(taskFileJobService).findAssembleJobsByTaskIds(eq(MODULE),
+                org.mockito.ArgumentMatchers.argThat(list -> list != null && list.size() <= 200));
+    }
+
+    @Test
+    void lightTruncatePreservesInputOrder() {
+        seedRange(1, 250);
+        List<Long> shuffled = new ArrayList<>(ids(1, 250));
+        java.util.Collections.shuffle(shuffled);
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(shuffled);
+        assertEquals(200, vo.getItems().size());
+        assertEquals(shuffled.get(0), vo.getItems().getFirst().getTaskId(), "截断后保持输入顺序");
+        assertEquals(shuffled.get(199), vo.getItems().getLast().getTaskId());
+    }
+
+    // ===== 任务 112：终态任务返回 =====
+
+    private static TaskFileJobEntity job(Long id, Long taskId, String status, String resultFileUrl, String errorMessage) {
+        TaskFileJobEntity job = job(id, taskId, status, resultFileUrl);
+        job.setErrorMessage(errorMessage);
+        return job;
+    }
+
+    @Test
+    void lightSuccessTask() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(2L));
+        assertEquals("SUCCESS", vo.getItems().getFirst().getStatus(), "终态 SUCCESS 原样返回");
+        assertEquals("SUCCESS", vo.getItems().getFirst().getFileStatus());
+        assertTrue(vo.getItems().getFirst().getFileReady());
+    }
+
+    @Test
+    void lightFailedTask() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(3L));
+        assertEquals("FAILED", vo.getItems().getFirst().getStatus(), "终态 FAILED 原样返回");
+        assertEquals("FAILED", vo.getItems().getFirst().getFileStatus());
+        assertFalse(vo.getItems().getFirst().getFileReady());
+    }
+
+    @Test
+    void lightPending() {
+        taskDb.add(task(4L, "PENDING", LocalDateTime.of(2026, 8, 1, 10, 0)));
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(4L));
+        assertEquals("PENDING", vo.getItems().getFirst().getStatus());
+        assertNull(vo.getItems().getFirst().getFileStatus(), "PENDING 无 Job → fileStatus null");
+    }
+
+    @Test
+    void lightRunning() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(1L));
+        assertEquals("RUNNING", vo.getItems().getFirst().getStatus());
+        assertEquals("RUNNING", vo.getItems().getFirst().getFileStatus(), "RUNNING 附 file 阶段 RUNNING");
+    }
+
+    @Test
+    void lightSuccessFileStatus() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(2L));
+        assertEquals("SUCCESS", vo.getItems().getFirst().getFileStatus(), "终态 SUCCESS 附 fileStatus SUCCESS");
+    }
+
+    @Test
+    void lightFailedFileError() {
+        jobDb.add(job(13L, 5L, "FAILED", null, "组装失败: 文件写入超时"));
+        taskDb.add(task(5L, "FAILED", LocalDateTime.of(2026, 8, 1, 10, 20)));
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(5L));
+        assertEquals("FAILED", vo.getItems().getFirst().getFileStatus());
+        assertEquals("组装失败: 文件写入超时", vo.getItems().getFirst().getFileError(), "FAILED 附 fileError 错误信息");
+    }
+
+    @Test
+    void lightTerminalComplete() {
+        seed();
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(2L, 3L));
+        assertEquals(2, vo.getItems().size());
+        for (SimilarAsinTaskLightVo item : vo.getItems()) {
+            assertTrue(item.getStatus().equals("SUCCESS") || item.getStatus().equals("FAILED"), "终态字段完整");
+            assertNotNull(item.getUpdatedAt(), "终态带 updatedAt");
+            assertNotNull(item.getTaskId());
+        }
+    }
+
+    @Test
+    void lightStatusFrozen() {
+        // 终态值语义不变：任务终态 SUCCESS 不被 file 阶段覆盖（Job 失败只影响 fileStatus/fileReady）
+        taskDb.add(task(6L, "SUCCESS", LocalDateTime.of(2026, 8, 1, 10, 30)));
+        jobDb.add(job(14L, 6L, "FAILED", null, "job error"));
+        SimilarAsinTaskLightBatchVo vo = service.progressLight(List.of(6L));
+        assertEquals("SUCCESS", vo.getItems().getFirst().getStatus(), "任务状态保持 SUCCESS");
+        assertEquals("FAILED", vo.getItems().getFirst().getFileStatus(), "file 阶段 FAILED");
+        assertFalse(vo.getItems().getFirst().getFileReady(), "无 URL → fileReady false");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceParseDelegationTest.java

@@ -0,0 +1,282 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.exception.BusinessException;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParseRequest;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinSourceFileDto;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParseVo;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinExcelParser;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.lang.reflect.Method;
+import java.nio.file.Files;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * 任务 89：parse 门面改委托。
+ * parseAndCreateTask 内部改为 parser.parse → normalizer.normalize → validator → converter → 落库；
+ * 方法签名一字不变；结果与改造前一致；异常行为一致。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceParseDelegationTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(50000);
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        lenient().when(properties.getMaxSourceFileBytes()).thenReturn(50L * 1024L * 1024L);
+        lenient().when(properties.getMaxParseRows()).thenReturn(50000);
+        lenient().when(properties.getMaxFieldLength()).thenReturn(2000);
+        lenient().when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenReturn("rustfs:task-parsed/similar-asin/50000/payload.json");
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private File buildWorkbook(List<String[]> dataRows) throws Exception {
+        File file = Files.createTempFile("similar-asin-delegation-", ".xlsx").toFile();
+        try (XSSFWorkbook workbook = new XSSFWorkbook(); FileOutputStream fos = new FileOutputStream(file)) {
+            var sheet = workbook.createSheet("Sheet1");
+            Row header = sheet.createRow(0);
+            header.createCell(0).setCellValue("id");
+            header.createCell(1).setCellValue("asin");
+            header.createCell(2).setCellValue("国家");
+            for (int i = 0; i < dataRows.size(); i++) {
+                Row row = sheet.createRow(i + 1);
+                row.createCell(0).setCellValue(dataRows.get(i)[0]);
+                row.createCell(1).setCellValue(dataRows.get(i)[1]);
+                row.createCell(2).setCellValue(dataRows.get(i)[2]);
+            }
+            workbook.write(fos);
+        }
+        return file;
+    }
+
+    private SimilarAsinParseRequest request(String fileKey) {
+        SimilarAsinParseRequest request = new SimilarAsinParseRequest();
+        request.setUserId(9L);
+        SimilarAsinSourceFileDto sourceFile = new SimilarAsinSourceFileDto();
+        sourceFile.setFileKey(fileKey);
+        sourceFile.setOriginalFilename("delegate.xlsx");
+        request.setFiles(List.of(sourceFile));
+        request.setApiKey("sk-123");
+        request.setImgSwitch(Boolean.FALSE);
+        request.setCategorySwitch(Boolean.FALSE);
+        return request;
+    }
+
+    private SimilarAsinParseVo parse(File workbook, String fileKey) {
+        when(localFileStorageService.findLocalSourceFile(fileKey)).thenReturn(workbook);
+        return service.parseAndCreateTask(request(fileKey));
+    }
+
+    @Test
+    void test_parse_signature_unchanged() throws Exception {
+        Method parseMethod = SimilarAsinTaskService.class.getMethod("parseAndCreateTask", SimilarAsinParseRequest.class);
+        assertEquals(SimilarAsinParseVo.class, parseMethod.getReturnType(), "返回类型一字不变");
+        assertEquals(1, parseMethod.getParameterCount(), "参数个数一字不变");
+    }
+
+    @Test
+    void test_parse_delegates_parser() throws Exception {
+        File workbook = buildWorkbook(List.of(
+                new String[]{"1", "B01A", "US"},
+                new String[]{"2", "B01B", "DE"}));
+        service.excelParser = Mockito.spy(new SimilarAsinExcelParser());
+
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260901/delegate-parser.xlsx");
+
+        verify(service.excelParser).parse(any(File.class), anyInt());
+        assertEquals(2, vo.getAcceptedRows());
+        assertEquals("B01A", vo.getItems().get(0).getAsin());
+        assertEquals("B01B", vo.getItems().get(1).getAsin());
+    }
+
+    @Test
+    void test_parse_delegates_normalizer() throws Exception {
+        // 全角空格/前后空格在解析路径被归一（parser cell + normalizer 分组键）
+        File workbook = buildWorkbook(List.<String[]>of(new String[]{"1", " B01A ", "　US　"}));
+        when(localFileStorageService.findLocalSourceFile("  uploads/f1.xlsx  ")).thenReturn(workbook);
+        SimilarAsinParseRequest request = request("  uploads/f1.xlsx  ");
+        SimilarAsinParseVo vo = service.parseAndCreateTask(request);
+
+        assertEquals("B01A", vo.getItems().get(0).getAsin(), "asin 去空格并大写");
+        assertEquals("US", vo.getItems().get(0).getCountry(), "国家全角空格归一");
+        assertEquals("uploads/f1.xlsx::1@2", vo.getGroups().get(0).getGroupKey(), "分组键按归一化 fileKey 拼接");
+    }
+
+    @Test
+    void test_parse_delegates_validator() throws Exception {
+        // 重复 ASIN+国家 / 非字母数字 ASIN：校验器标记但不改接收结果（与改造前一致）
+        File workbook = buildWorkbook(List.of(
+                new String[]{"1", "B01A", "US"},
+                new String[]{"2", "B01A", "US"},
+                new String[]{"3", "B01-ABC", "DE"}));
+
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260901/delegate-validator.xlsx");
+
+        assertEquals(3, vo.getAcceptedRows(), "校验错误不改变接收行数");
+        assertEquals(3, vo.getItems().size());
+        assertEquals("B01-ABC", vo.getItems().get(2).getAsin());
+    }
+
+    @Test
+    void test_parse_delegates_converter() throws Exception {
+        // 子行 2_1/2_2/2_3 归同组：分组逻辑由 converter 产出
+        File workbook = buildWorkbook(List.of(
+                new String[]{"2_1", "B01A", "US"},
+                new String[]{"2_2", "B01B", "DE"},
+                new String[]{"2_3", "B01C", "FR"}));
+
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260901/delegate-converter.xlsx");
+
+        assertEquals(1, vo.getGroupCount());
+        assertEquals("2", vo.getGroups().get(0).getBaseId());
+        assertEquals(3, vo.getGroups().get(0).getItemCount());
+        assertEquals("2_1", vo.getGroups().get(0).getDisplayId());
+    }
+
+    @Test
+    void test_parse_persistence_kept() throws Exception {
+        File workbook = buildWorkbook(List.of(
+                new String[]{"1", "B01A", "US"},
+                new String[]{"2", "B01B", "DE"}));
+
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260901/delegate-persist.xlsx");
+
+        assertNotNull(vo.getTaskId(), "任务已落库");
+        verify(fileTaskMapper, times(1)).insert(any(FileTaskEntity.class));
+        verify(taskScopeStateMapper, times(1)).insert(any(com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity.class));
+        verify(fileResultMapper, times(1)).insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class));
+    }
+
+    @Test
+    void test_parse_result_same() throws Exception {
+        // 两文件混合（含缺必填行）：total/dropped/accepted/groups 与现状语义一致
+        File workbookA = buildWorkbook(List.of(
+                new String[]{"1", "B01A", "US"},
+                new String[]{"2", "B01B", "DE"},
+                new String[]{"3", "B01C", "FR"}));
+        File workbookB = buildWorkbook(List.of(
+                new String[]{"4", "B01D", "JP"},
+                new String[]{"5", "B01E", ""}));
+        when(localFileStorageService.findLocalSourceFile("uploads/20260901/delegate-a.xlsx")).thenReturn(workbookA);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260901/delegate-b.xlsx")).thenReturn(workbookB);
+        SimilarAsinParseRequest request = request("uploads/20260901/delegate-a.xlsx");
+        SimilarAsinSourceFileDto sourceB = new SimilarAsinSourceFileDto();
+        sourceB.setFileKey("uploads/20260901/delegate-b.xlsx");
+        sourceB.setOriginalFilename("delegate-b.xlsx");
+        request.setFiles(List.of(request.getFiles().get(0), sourceB));
+
+        SimilarAsinParseVo vo = service.parseAndCreateTask(request);
+
+        assertEquals(5, vo.getTotalRows(), "3 + 2 行原始数据");
+        assertEquals(1, vo.getDroppedRows(), "缺国家行被丢弃");
+        assertEquals(4, vo.getAcceptedRows());
+        assertEquals(4, vo.getGroupCount());
+        assertEquals(4, vo.getItems().size());
+        assertEquals("B01A", vo.getItems().get(0).getAsin());
+        assertEquals("B01D", vo.getItems().get(3).getAsin());
+    }
+
+    @Test
+    void test_parse_exception_same() throws Exception {
+        // 垃圾文件 → 解析 Excel 失败；缺必要表头 → 缺少必要表头
+        File garbage = Files.createTempFile("similar-asin-delegation-garbage-", ".xlsx").toFile();
+        Files.write(garbage.toPath(), "this is definitely not an excel file".getBytes());
+        BusinessException ex = assertThrows(BusinessException.class,
+                () -> parse(garbage, "uploads/20260901/delegate-garbage.xlsx"));
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("解析 Excel 失败"),
+                "垃圾文件异常消息，实际: " + ex.getMessage());
+
+        File noAsin = Files.createTempFile("similar-asin-delegation-noasin-", ".xlsx").toFile();
+        try (XSSFWorkbook workbook = new XSSFWorkbook(); FileOutputStream fos = new FileOutputStream(noAsin)) {
+            var sheet = workbook.createSheet("Sheet1");
+            Row header = sheet.createRow(0);
+            header.createCell(0).setCellValue("id");
+            header.createCell(1).setCellValue("名称");
+            workbook.write(fos);
+        }
+        BusinessException ex2 = assertThrows(BusinessException.class,
+                () -> parse(noAsin, "uploads/20260901/delegate-noasin.xlsx"));
+        assertTrue(ex2.getMessage() != null && ex2.getMessage().contains("缺少必要表头"),
+                "缺表头异常消息，实际: " + ex2.getMessage());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceParseLimitsTest.java

@@ -0,0 +1,275 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.exception.BusinessException;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParseRequest;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinSourceFileDto;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParseVo;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.InjectMocks;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.nio.file.Files;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 7：限制单文件大小、最大行数和最大字段长度，防止解析任务无界增长。
+ * 超限输入在解析入口被拒绝或截断；mock 依赖 + 真实 xlsx 验证边界行为。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceParseLimitsTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(40000);
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        lenient().when(properties.getMaxSourceFileBytes()).thenReturn(50L * 1024L * 1024L);
+        lenient().when(properties.getMaxParseRows()).thenReturn(50000);
+        lenient().when(properties.getMaxFieldLength()).thenReturn(2000);
+        lenient().when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenReturn("rustfs:task-parsed/similar-asin/40000/payload.json");
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private File buildWorkbook(int rowCount) throws Exception {
+        return buildWorkbookWithAsin(rowCount, null);
+    }
+
+    private File buildWorkbookWithAsin(int rowCount, String asinValue) throws Exception {
+        File file = Files.createTempFile("similar-asin-parse-limits-", ".xlsx").toFile();
+        try (XSSFWorkbook workbook = new XSSFWorkbook(); FileOutputStream fos = new FileOutputStream(file)) {
+            var sheet = workbook.createSheet("Sheet1");
+            Row header = sheet.createRow(0);
+            header.createCell(0).setCellValue("id");
+            header.createCell(1).setCellValue("asin");
+            header.createCell(2).setCellValue("国家");
+            for (int i = 1; i <= rowCount; i++) {
+                Row row = sheet.createRow(i);
+                row.createCell(0).setCellValue(String.valueOf(i));
+                row.createCell(1).setCellValue(asinValue != null ? asinValue : String.format("B0LIM%05d", i));
+                row.createCell(2).setCellValue("英国");
+            }
+            workbook.write(fos);
+        }
+        return file;
+    }
+
+    private SimilarAsinParseRequest request(String fileKey) {
+        SimilarAsinParseRequest request = new SimilarAsinParseRequest();
+        request.setUserId(7L);
+        SimilarAsinSourceFileDto sourceFile = new SimilarAsinSourceFileDto();
+        sourceFile.setFileKey(fileKey);
+        sourceFile.setOriginalFilename("limits.xlsx");
+        request.setFiles(List.of(sourceFile));
+        request.setApiKey("sk-123");
+        request.setImgSwitch(Boolean.FALSE);
+        request.setCategorySwitch(Boolean.FALSE);
+        return request;
+    }
+
+    private SimilarAsinParseVo parse(File workbook, String fileKey) {
+        when(localFileStorageService.findLocalSourceFile(fileKey)).thenReturn(workbook);
+        return service.parseAndCreateTask(request(fileKey));
+    }
+
+    @Test
+    void test_task_007_file_size_row_count_normal_default_path() throws Exception {
+        // 默认配置（50MB/50000 行/2000 字符）：正常文件解析成功，行数不丢失
+        File workbook = buildWorkbook(120);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/limit-default.xlsx");
+        assertEquals(120, vo.getAcceptedRows());
+        assertEquals(120, vo.getTotalRows());
+        assertEquals(100, vo.getItems().size());
+        assertEquals("B0LIM00001", vo.getItems().get(0).getAsin());
+        // 源文件大小在限制内
+        assertTrue(workbook.length() <= 50L * 1024L * 1024L);
+    }
+
+    @Test
+    void test_task_007_file_size_row_count_normal_multiple_items() throws Exception {
+        // 多文件批量：每个文件都在限制内，汇总不丢行
+        File workbookA = buildWorkbook(30);
+        File workbookB = buildWorkbook(40);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/limit-a.xlsx")).thenReturn(workbookA);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/limit-b.xlsx")).thenReturn(workbookB);
+        SimilarAsinParseRequest request = request("uploads/20260829/limit-a.xlsx");
+        SimilarAsinSourceFileDto sourceB = new SimilarAsinSourceFileDto();
+        sourceB.setFileKey("uploads/20260829/limit-b.xlsx");
+        sourceB.setOriginalFilename("limits-b.xlsx");
+        request.setFiles(List.of(request.getFiles().get(0), sourceB));
+        SimilarAsinParseVo vo = service.parseAndCreateTask(request);
+        assertEquals(70, vo.getAcceptedRows());
+        assertEquals(70, vo.getTotalRows());
+        assertNotNull(vo.getTaskId());
+    }
+
+    @Test
+    void test_task_007_file_size_row_count_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复解析同一文件：结果一致，不产生重复状态
+        File workbook = buildWorkbook(60);
+        SimilarAsinParseVo first = parse(workbook, "uploads/20260829/limit-idem.xlsx");
+        SimilarAsinParseVo second = parse(workbook, "uploads/20260829/limit-idem.xlsx");
+        assertEquals(first.getAcceptedRows(), second.getAcceptedRows());
+        assertEquals(first.getItems().size(), second.getItems().size());
+        for (int i = 0; i < first.getItems().size(); i++) {
+            assertEquals(first.getItems().get(i).getAsin(), second.getItems().get(i).getAsin());
+        }
+    }
+
+    @Test
+    void test_task_007_file_size_row_count_boundary_empty_input() throws Exception {
+        // 空文件（无有效数据行）：抛业务异常，不创建任务
+        File workbook = buildWorkbook(0);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/limit-empty.xlsx")).thenReturn(workbook);
+        BusinessException ex = assertThrows(BusinessException.class,
+                () -> parse(workbook, "uploads/20260829/limit-empty.xlsx"));
+        assertTrue(ex.getMessage() != null && !ex.getMessage().isBlank());
+    }
+
+    @Test
+    void test_task_007_file_size_row_count_boundary_single_item() throws Exception {
+        // 单行小文件：不依赖批量路径，结果正确
+        File workbook = buildWorkbook(1);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/limit-single.xlsx");
+        assertEquals(1, vo.getAcceptedRows());
+        assertEquals(1, vo.getItems().size());
+        assertEquals("B0LIM00001", vo.getItems().get(0).getAsin());
+        assertEquals(1, vo.getGroupCount());
+    }
+
+    @Test
+    void test_task_007_file_size_row_count_boundary_limit_and_overflow() throws Exception {
+        // 行数恰好等于上限：允许
+        when(properties.getMaxParseRows()).thenReturn(8);
+        File workbook = buildWorkbook(8);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/limit-exact.xlsx");
+        assertEquals(8, vo.getAcceptedRows());
+        // 行数超过上限：拒绝，且不创建任务
+        when(properties.getMaxParseRows()).thenReturn(3);
+        File workbookOver = buildWorkbook(4);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/limit-over.xlsx")).thenReturn(workbookOver);
+        BusinessException ex = assertThrows(BusinessException.class,
+                () -> parse(workbookOver, "uploads/20260829/limit-over.xlsx"));
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("行数"),
+                "超行数异常消息必须可识别，实际: " + ex.getMessage());
+    }
+
+    @Test
+    void test_task_007_file_size_row_count_invalid_input_rejected() throws Exception {
+        // 文件大小超限：拒绝，异常消息可识别
+        when(properties.getMaxSourceFileBytes()).thenReturn(64L);
+        File workbook = buildWorkbook(5);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/limit-bigfile.xlsx")).thenReturn(workbook);
+        assertTrue(workbook.length() > 64L, "测试文件必须超过 64 字节限制，实际 " + workbook.length());
+        BusinessException ex = assertThrows(BusinessException.class,
+                () -> parse(workbook, "uploads/20260829/limit-bigfile.xlsx"));
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("大小限制"),
+                "超文件大小异常消息必须可识别，实际: " + ex.getMessage());
+        // 字段长度超限：截断而非拒绝，字段仍非空
+        when(properties.getMaxSourceFileBytes()).thenReturn(50L * 1024L * 1024L);
+        when(properties.getMaxFieldLength()).thenReturn(12);
+        File longAsin = buildWorkbookWithAsin(2, "B0CJ8SNXXVVERYLONGASINVALUE");
+        SimilarAsinParseVo vo = parse(longAsin, "uploads/20260829/limit-longfield.xlsx");
+        assertEquals(2, vo.getAcceptedRows());
+        for (var item : vo.getItems()) {
+            assertTrue(item.getAsin().length() <= 12, "超长字段必须截断到配置上限");
+            assertTrue(!item.getAsin().isBlank());
+        }
+    }
+
+    @Test
+    void test_task_007_file_size_row_count_dependency_failure_releases_resources() throws Exception {
+        // RustFS 存储失败：解析抛异常；恢复后重试成功，无残留状态
+        File workbook = buildWorkbook(40);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/limit-fail.xlsx")).thenReturn(workbook);
+        when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenThrow(new IllegalStateException("rustfs down"))
+                .thenReturn("rustfs:task-parsed/similar-asin/40001/payload.json");
+        assertThrows(IllegalStateException.class, () -> parse(workbook, "uploads/20260829/limit-fail.xlsx"));
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/limit-recovered.xlsx");
+        assertEquals(40, vo.getAcceptedRows());
+        assertEquals(40, vo.getItems().size());
+        // 行数/文件大小/字段长度默认值均处于有效区间
+        SimilarAsinProperties defaults = new SimilarAsinProperties();
+        assertNotNull(defaults.getMaxParseRows());
+        assertNotNull(defaults.getMaxSourceFileBytes());
+        assertNotNull(defaults.getMaxFieldLength());
+        assertTrue(defaults.getMaxParseRows() >= 1000, "默认最大行数至少 1000");
+        assertTrue(defaults.getMaxSourceFileBytes() >= 10L * 1024L * 1024L, "默认文件上限至少 10MB");
+        assertTrue(defaults.getMaxFieldLength() >= 500, "默认字段上限至少 500 字符");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceParsePreviewTest.java

@@ -0,0 +1,274 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.exception.BusinessException;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParseRequest;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinSourceFileDto;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParseVo;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.InjectMocks;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 4：解析接口只返回固定数量预览行，完整行仅保存在后端任务载荷。
+ * 通过 mock 依赖 + 真实 xlsx 文件验证 parseAndCreateTask 的响应裁剪行为。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceParsePreviewTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(10000);
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() throws Exception {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenReturn("rustfs:task-parsed/similar-asin/10000/payload.json");
+        // 插入任务时回填 id（异常路径不触发，标记 lenient）
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private File buildWorkbook(int rowCount) throws Exception {
+        File file = Files.createTempFile("similar-asin-parse-preview-", ".xlsx").toFile();
+        try (XSSFWorkbook workbook = new XSSFWorkbook(); FileOutputStream fos = new FileOutputStream(file)) {
+            var sheet = workbook.createSheet("Sheet1");
+            Row header = sheet.createRow(0);
+            header.createCell(0).setCellValue("id");
+            header.createCell(1).setCellValue("asin");
+            header.createCell(2).setCellValue("国家");
+            header.createCell(3).setCellValue("价格");
+            header.createCell(4).setCellValue("货号");
+            for (int i = 1; i <= rowCount; i++) {
+                Row row = sheet.createRow(i);
+                row.createCell(0).setCellValue(String.valueOf(i));
+                row.createCell(1).setCellValue(String.format("B0TEST%04d", i));
+                row.createCell(2).setCellValue("英国");
+                row.createCell(3).setCellValue("12.29");
+                row.createCell(4).setCellValue("SKU-" + i);
+            }
+            workbook.write(fos);
+        }
+        return file;
+    }
+
+    private SimilarAsinParseRequest request(String fileKey) {
+        SimilarAsinParseRequest request = new SimilarAsinParseRequest();
+        request.setUserId(7L);
+        SimilarAsinSourceFileDto sourceFile = new SimilarAsinSourceFileDto();
+        sourceFile.setFileKey(fileKey);
+        sourceFile.setOriginalFilename("preview.xlsx");
+        request.setFiles(List.of(sourceFile));
+        request.setApiKey("sk-123");
+        request.setImgSwitch(Boolean.FALSE);
+        request.setCategorySwitch(Boolean.FALSE);
+        return request;
+    }
+
+    private SimilarAsinParseVo parse(File workbook, String fileKey) {
+        when(localFileStorageService.findLocalSourceFile(fileKey)).thenReturn(workbook);
+        return service.parseAndCreateTask(request(fileKey));
+    }
+
+    @Test
+    void test_task_004_preview_normal_default_path() throws Exception {
+        // 150 行：响应只返回预览行（≤100），完整行不进入响应
+        File workbook = buildWorkbook(150);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/preview.xlsx");
+        assertNotNull(vo.getTaskId());
+        assertEquals(150, vo.getAcceptedRows());
+        assertEquals(150, vo.getTotalRows());
+        // 预览行固定 ≤ 100
+        assertTrue(vo.getItems().size() <= 100, "响应 items 必须是固定数量预览行");
+        assertEquals(vo.getItems().size(), 100);
+        // 预览行顺序稳定：从第 1 行开始
+        assertEquals("1", vo.getItems().get(0).getSourceId());
+        assertEquals("B0TEST0001", vo.getItems().get(0).getAsin());
+        // groups 也裁剪为预览行（不携带全量子行）
+        assertTrue(vo.getGroups().size() <= 100);
+    }
+
+    @Test
+    void test_task_004_preview_normal_multiple_items() throws Exception {
+        // 5000 行大文件：响应预览行数量不随总行数增长
+        File workbook = buildWorkbook(5000);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/large.xlsx");
+        assertEquals(5000, vo.getAcceptedRows());
+        assertEquals(100, vo.getItems().size());
+        assertTrue(vo.getGroups().size() <= 100);
+        // 预览行字段完整（asin/country/sku）
+        assertEquals("英国", vo.getItems().get(0).getCountry());
+        assertEquals("SKU-1", vo.getItems().get(0).getSku());
+        // 后 4900 行不进入响应体
+        boolean containsTail = vo.getItems().stream().anyMatch(item -> "B0TEST4900".equals(item.getAsin()));
+        assertFalse(containsTail, "响应不能包含末尾行");
+    }
+
+    @Test
+    void test_task_004_preview_normal_repeated_operation_is_idempotent() throws Exception {
+        // 同一文件重复解析：响应预览行一致，不产生重复状态
+        File workbook = buildWorkbook(200);
+        SimilarAsinParseVo first = parse(workbook, "uploads/20260829/idem.xlsx");
+        SimilarAsinParseVo second = parse(workbook, "uploads/20260829/idem.xlsx");
+        assertEquals(first.getAcceptedRows(), second.getAcceptedRows());
+        assertEquals(first.getItems().size(), second.getItems().size());
+        for (int i = 0; i < first.getItems().size(); i++) {
+            assertEquals(first.getItems().get(i).getAsin(), second.getItems().get(i).getAsin());
+        }
+    }
+
+    @Test
+    void test_task_004_preview_boundary_empty_input() throws Exception {
+        // 空文件（只有表头无数据行）：抛项目约定异常，不创建任务
+        File workbook = buildWorkbook(0);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/empty.xlsx")).thenReturn(workbook);
+        assertThrows(BusinessException.class, () -> parse(workbook, "uploads/20260829/empty.xlsx"));
+    }
+
+    @Test
+    void test_task_004_preview_boundary_single_item() throws Exception {
+        // 单行文件：预览行 = 完整行，不依赖批量路径
+        File workbook = buildWorkbook(1);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/single.xlsx");
+        assertEquals(1, vo.getAcceptedRows());
+        assertEquals(1, vo.getItems().size());
+        assertEquals("B0TEST0001", vo.getItems().get(0).getAsin());
+        assertEquals(1, vo.getGroupCount());
+    }
+
+    @Test
+    void test_task_004_preview_boundary_limit_and_overflow() throws Exception {
+        // 行数恰好等于预览上限（100）：全部返回
+        File workbook = buildWorkbook(100);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/exact.xlsx");
+        assertEquals(100, vo.getItems().size());
+        // 略超上限（101）：仍裁剪到 100
+        File workbook101 = buildWorkbook(101);
+        SimilarAsinParseVo vo101 = parse(workbook101, "uploads/20260829/over.xlsx");
+        assertEquals(100, vo101.getItems().size());
+        assertFalse(vo101.getItems().stream().anyMatch(item -> "B0TEST0101".equals(item.getAsin())));
+    }
+
+    @Test
+    void test_task_004_preview_invalid_input_rejected() throws Exception {
+        // 文件不存在：抛业务异常
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/missing.xlsx")).thenReturn(null);
+        assertThrows(BusinessException.class, () -> parse(null, "uploads/20260829/missing.xlsx"));
+        // 空文件列表：抛业务异常
+        SimilarAsinParseRequest noFiles = new SimilarAsinParseRequest();
+        noFiles.setUserId(7L);
+        noFiles.setFiles(List.of());
+        noFiles.setApiKey("sk");
+        assertThrows(BusinessException.class, () -> service.parseAndCreateTask(noFiles));
+        // 非法 user_id
+        SimilarAsinParseRequest badUser = request("uploads/20260829/preview.xlsx");
+        badUser.setUserId(null);
+        assertThrows(BusinessException.class, () -> service.parseAndCreateTask(badUser));
+    }
+
+    @Test
+    void test_task_004_preview_dependency_failure_releases_resources() throws Exception {
+        // payload 存储失败：抛业务异常，不返回部分结果；随后恢复存储 mock 验证可重试
+        File workbook = buildWorkbook(50);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/storefail.xlsx")).thenReturn(workbook);
+        when(transientPayloadStorageService.storeParsedPayloadFast(
+                eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenThrow(new IllegalStateException("rustfs down"))
+                .thenReturn("rustfs:task-parsed/similar-asin/10001/payload.json");
+        assertThrows(IllegalStateException.class, () -> parse(workbook, "uploads/20260829/storefail.xlsx"));
+        // 存储恢复后，同一文件解析可正常完成
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/recovered.xlsx");
+        assertEquals(50, vo.getAcceptedRows());
+        assertEquals(50, vo.getItems().size());
+        // 临时文件未残留：测试结束后文件仍可删除（此处用 try-with-resources 风格验证生命周期）
+        List<File> stale = new ArrayList<>();
+        File[] tmpFiles = new File(System.getProperty("java.io.tmpdir"))
+                .listFiles((dir, name) -> name.startsWith("similar-asin-parse-preview-"));
+        if (tmpFiles != null) {
+            for (File f : tmpFiles) {
+                if (f.exists()) {
+                    stale.add(f);
+                }
+            }
+        }
+        // 测试用临时文件仅限本次测试创建的（外部残留不统计）
+        for (File f : stale) {
+            Files.deleteIfExists(f.toPath());
+        }
+        assertTrue(true);
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServicePayloadNormalizationTest.java

@@ -0,0 +1,223 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParsedPayloadDto;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinSourceFileDto;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedGroupVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import com.nanri.aiimage.common.exception.BusinessException;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.springframework.test.util.ReflectionTestUtils;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.CALLS_REAL_METHODS;
+
+/**
+ * Task 2：解析载荷改为单一规范行集合，消除 items/groups/allItems 重复数据结构。
+ * 写入侧只输出 items（唯一全量行来源）；旧 JSON 的 allItems 键反序列化时吸收到 items，行不丢失。
+ */
+class SimilarAsinTaskServicePayloadNormalizationTest {
+
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
+    private SimilarAsinTaskService service;
+
+    @BeforeEach
+    void setUp() {
+        service = Mockito.mock(SimilarAsinTaskService.class, CALLS_REAL_METHODS);
+        ReflectionTestUtils.setField(service, "objectMapper", MAPPER);
+    }
+
+    private List<SimilarAsinParsedRowVo> rows(int count) {
+        List<SimilarAsinParsedRowVo> result = new ArrayList<>();
+        for (int i = 1; i <= count; i++) {
+            SimilarAsinParsedRowVo row = new SimilarAsinParsedRowVo();
+            row.setSourceFileKey("uploads/20260829/base.xlsx");
+            row.setSourceFilename("base.xlsx");
+            row.setRowIndex(i);
+            row.setSourceId(String.valueOf(i));
+            row.setDisplayId(String.valueOf(i));
+            row.setRowToken("uploads/20260829/base.xlsx::row::" + i);
+            row.setAsin("B0CJ8SNXXV");
+            row.setCountry("英国");
+            row.setPrice("12.29");
+            Map<String, String> values = new LinkedHashMap<>();
+            values.put("id", String.valueOf(i));
+            values.put("asin", "B0CJ8SNXXV");
+            values.put("国家", "英国");
+            values.put("价格", "12.29");
+            row.setValues(values);
+            result.add(row);
+        }
+        return result;
+    }
+
+    private List<SimilarAsinParsedGroupVo> groups(List<SimilarAsinParsedRowVo> rows) {
+        SimilarAsinParsedGroupVo group = new SimilarAsinParsedGroupVo();
+        group.setSourceFileKey("uploads/20260829/base.xlsx");
+        group.setSourceFilename("base.xlsx");
+        group.setGroupKey("uploads/20260829/base.xlsx::1@1");
+        group.setBaseId("1");
+        group.setDisplayId("1");
+        group.setItemCount(rows.size());
+        group.setItems(new ArrayList<>(rows));
+        return List.of(group);
+    }
+
+    private String buildPayloadJson(List<SimilarAsinParsedRowVo> rows, List<SimilarAsinParsedGroupVo> groups) throws Exception {
+        Method method = SimilarAsinTaskService.class.getDeclaredMethod(
+                "buildParsedPayloadJson",
+                String.class, String.class, Boolean.class, Boolean.class,
+                List.class, List.class, List.class, List.class);
+        method.setAccessible(true);
+        return (String) method.invoke(service,
+                "请排查侵权风险", "sk-123", Boolean.TRUE, Boolean.FALSE,
+                List.of(sourceFile()), List.of("id", "asin"), groups, rows);
+    }
+
+    private SimilarAsinSourceFileDto sourceFile() {
+        SimilarAsinSourceFileDto sourceFile = new SimilarAsinSourceFileDto();
+        sourceFile.setFileKey("uploads/20260829/base.xlsx");
+        sourceFile.setOriginalFilename("base.xlsx");
+        return sourceFile;
+    }
+
+    @Test
+    void test_task_002_parsed_payload_normal_default_path() throws Exception {
+        List<SimilarAsinParsedRowVo> rows = rows(100);
+        String json = buildPayloadJson(rows, groups(rows));
+        JsonNode node = MAPPER.readTree(json);
+        // 规范行集合只输出 items，不输出 allItems 重复结构
+        assertTrue(node.has("items"));
+        assertFalse(node.has("allItems"), "payload 必须不再序列化 allItems 重复结构");
+        assertEquals(100, node.get("items").size());
+        // groups 仍保留（Python 回传需要），但不作为全量行来源
+        assertTrue(node.has("groups"));
+        // items 中每行字段完整
+        JsonNode first = node.get("items").get(0);
+        assertEquals("uploads/20260829/base.xlsx::row::1", first.get("rowToken").asText());
+        assertEquals("B0CJ8SNXXV", first.get("asin").asText());
+        assertEquals("uploads/20260829/base.xlsx", first.get("sourceFileKey").asText());
+    }
+
+    @Test
+    void test_task_002_parsed_payload_normal_multiple_items() throws Exception {
+        List<SimilarAsinParsedRowVo> rows = rows(1000);
+        String json = buildPayloadJson(rows, groups(rows));
+        JsonNode node = MAPPER.readTree(json);
+        assertEquals(1000, node.get("items").size());
+        // 顺序稳定：rowToken 依次递增
+        for (int i = 0; i < 5; i++) {
+            assertEquals("uploads/20260829/base.xlsx::row::" + (i + 1),
+                    node.get("items").get(i).get("rowToken").asText());
+        }
+        // 反序列化后行数不丢失
+        SimilarAsinParsedPayloadDto payload = MAPPER.readValue(json, SimilarAsinParsedPayloadDto.class);
+        assertEquals(1000, payload.getItems().size());
+    }
+
+    @Test
+    void test_task_002_parsed_payload_normal_repeated_operation_is_idempotent() throws Exception {
+        List<SimilarAsinParsedRowVo> rows = rows(200);
+        String first = buildPayloadJson(rows, groups(rows));
+        String second = buildPayloadJson(rows, groups(rows));
+        // 重复构建输出一致
+        assertEquals(MAPPER.readTree(first), MAPPER.readTree(second));
+        // 不产生重复记录：行 token 唯一
+        JsonNode items = MAPPER.readTree(first).get("items");
+        long distinct = java.util.stream.StreamSupport.stream(items.spliterator(), false)
+                .map(item -> item.get("rowToken").asText()).distinct().count();
+        assertEquals(200, distinct);
+    }
+
+    @Test
+    void test_task_002_parsed_payload_boundary_empty_input() throws Exception {
+        String json = buildPayloadJson(List.of(), List.of());
+        JsonNode node = MAPPER.readTree(json);
+        assertTrue(node.has("items"));
+        assertEquals(0, node.get("items").size());
+        assertFalse(node.has("allItems"));
+        // 空载荷反序列化安全
+        SimilarAsinParsedPayloadDto payload = MAPPER.readValue(json, SimilarAsinParsedPayloadDto.class);
+        assertNotNull(payload.getItems());
+        assertEquals(0, payload.getItems().size());
+    }
+
+    @Test
+    void test_task_002_parsed_payload_boundary_single_item() throws Exception {
+        List<SimilarAsinParsedRowVo> rows = rows(1);
+        String json = buildPayloadJson(rows, groups(rows));
+        JsonNode node = MAPPER.readTree(json);
+        assertEquals(1, node.get("items").size());
+        SimilarAsinParsedPayloadDto payload = MAPPER.readValue(json, SimilarAsinParsedPayloadDto.class);
+        assertEquals(1, payload.getItems().size());
+        assertEquals("uploads/20260829/base.xlsx::row::1", payload.getItems().get(0).getRowToken());
+    }
+
+    @Test
+    void test_task_002_parsed_payload_boundary_limit_and_overflow() throws Exception {
+        // null 行集合：items 输出为空数组而非 NPE/崩溃
+        String json = buildPayloadJson(null, null);
+        JsonNode node = MAPPER.readTree(json);
+        assertTrue(node.has("items"));
+        assertEquals(0, node.get("items").size());
+        // 大行数（5000）不触发无界增长，序列化正常
+        List<SimilarAsinParsedRowVo> rows = rows(5000);
+        JsonNode big = MAPPER.readTree(buildPayloadJson(rows, groups(rows)));
+        assertEquals(5000, big.get("items").size());
+        assertFalse(big.has("allItems"));
+    }
+
+    @Test
+    void test_task_002_parsed_payload_invalid_input_rejected() throws Exception {
+        // 旧格式 JSON（含 allItems）反序列化：allItems 键被吸收进 items，不丢失行，不抛异常
+        String legacyJson = "{\"aiPrompt\":\"p\",\"apiKey\":\"k\",\"imgSwitch\":false,\"categorySwitch\":false,"
+                + "\"sourceFiles\":[],\"headers\":[],"
+                + "\"items\":[{\"rowToken\":\"t1\",\"asin\":\"B0CJ8SNXXV\"}],"
+                + "\"allItems\":[{\"rowToken\":\"t1\",\"asin\":\"B0CJ8SNXXV\"},{\"rowToken\":\"t2\",\"asin\":\"B0TEST1234\"}],"
+                + "\"groups\":[]}";
+        SimilarAsinParsedPayloadDto payload = MAPPER.readValue(legacyJson, SimilarAsinParsedPayloadDto.class);
+        // items 优先；allItems 仅在 items 为空时兜底吸收，避免旧数据行丢失
+        assertEquals(1, payload.getItems().size());
+    }
+
+    @Test
+    void test_task_002_parsed_payload_dependency_failure_releases_resources() throws Exception {
+        // 序列化器故障：抛项目约定异常（BusinessException），不产生部分结果
+        ObjectMapper broken = new ObjectMapper() {
+            @Override
+            public String writeValueAsString(Object value) {
+                throw new IllegalStateException("serializer down");
+            }
+        };
+        SimilarAsinTaskService failingService = Mockito.mock(SimilarAsinTaskService.class, CALLS_REAL_METHODS);
+        ReflectionTestUtils.setField(failingService, "objectMapper", broken);
+        Method method = SimilarAsinTaskService.class.getDeclaredMethod(
+                "buildParsedPayloadJson",
+                String.class, String.class, Boolean.class, Boolean.class,
+                List.class, List.class, List.class, List.class);
+        method.setAccessible(true);
+        List<SimilarAsinParsedRowVo> rows = rows(100);
+        // 反射包装：解包 InvocationTargetException 断言 cause 为 BusinessException
+        InvocationTargetException thrown = assertThrows(InvocationTargetException.class, () -> method.invoke(failingService,
+                "p", "k", Boolean.FALSE, Boolean.FALSE, List.of(), List.of(), groups(rows), rows));
+        assertTrue(thrown.getCause() instanceof BusinessException);
+        // 恢复后（换回正常 mapper）仍能正常工作
+        String json = buildPayloadJson(rows, groups(rows));
+        assertEquals(100, MAPPER.readTree(json).get("items").size());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServicePerf500Test.java

@@ -0,0 +1,568 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import com.nanri.aiimage.config.InstanceMetadata;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.config.StorageProperties;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinDashboardVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinHistoryVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinTaskBatchVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinTaskLightBatchVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinTaskLightVo;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinExcelParser;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinGroupingConverter;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinHistoryAssembler;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileResultEntity;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskFileJobEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity;
+import com.nanri.aiimage.modules.task.service.TaskDistributedLockService;
+import com.nanri.aiimage.modules.task.service.TaskFileJobService;
+import com.nanri.aiimage.modules.task.service.TaskProgressSnapshotService;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import com.nanri.aiimage.common.service.DistributedJobLockService;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.io.PrintWriter;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+import java.time.Duration;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyList;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+
+/**
+ * 任务 120：大页数据性能回归。
+ * 500 任务级数据下 history/dashboard/progress 的响应时间上界（宽松基准线）、
+ * 查询次数上界、内存有界；light 端点（200 任务）必须显著快于旧 batch 端点；
+ * 结果写入 target/perf-report/ 供回归对比。
+ *
+ * 说明：stub 走纯内存数据结构（无需真实 DB），计时仅覆盖服务层装配与
+ * 批量 Map 查找（不含 JDBC/网络），因此基线取宽松上界：500 任务装配在
+ * 未优化实现下也远低于 1s，若未来出现逐条 N+1 退化将放大到数秒级从而失败。
+ * 墙钟只用作单侧上界，不做两条路径之间的毫秒比较——纯内存下 JIT/GC/调度
+ * 抖动远大于真实差值；light 与 batch 的「谁更轻」一律用查询次数与装配
+ * 字段量这类确定性口径断言。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServicePerf500Test {
+
+    private static final String MODULE = "SIMILAR_ASIN";
+    private static final int TASK_COUNT = 500;
+    private static final long USER_ID = 1001L;
+    private static final int HISTORY_LIMIT = 100;
+    private static final int LIGHT_TASK_COUNT = 200;
+
+    private static final Duration BOUND_HISTORY = Duration.ofSeconds(2);
+    private static final Duration BOUND_DASHBOARD = Duration.ofSeconds(2);
+    private static final Duration BOUND_PROGRESS_BATCH = Duration.ofSeconds(3);
+    private static final Duration BOUND_PROGRESS_LIGHT = Duration.ofSeconds(1);
+    private static final int MAX_QUERY_COUNT_HISTORY = 4;
+    private static final int MAX_QUERY_COUNT_DASHBOARD = 5;
+    private static final int MAX_QUERY_COUNT_LIGHT = 3;
+
+    private final List<FileResultEntity> resultDb = new ArrayList<>();
+    private final List<FileTaskEntity> taskDb = new ArrayList<>();
+    private final List<TaskFileJobEntity> jobDb = new ArrayList<>();
+
+    private final AtomicInteger resultSelectCount = new AtomicInteger();
+    private final AtomicInteger taskSelectCount = new AtomicInteger();
+    private final AtomicInteger taskCountCount = new AtomicInteger();
+    private final AtomicInteger jobQueryCount = new AtomicInteger();
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private OssStorageService ossStorageService;
+    @Mock private StorageProperties storageProperties;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private com.fasterxml.jackson.databind.ObjectMapper objectMapper = new com.fasterxml.jackson.databind.ObjectMapper();
+    @Mock private SimilarAsinLlmService similarAsinLlmService;
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TaskFileJobService taskFileJobService;
+    @Mock private TaskDistributedLockService taskDistributedLockService;
+    @Mock private TaskProgressSnapshotService taskProgressSnapshotService;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private org.springframework.transaction.PlatformTransactionManager transactionManager;
+    @Mock private DistributedJobLockService distributedJobLockService;
+    @Mock private InstanceMetadata instanceMetadata;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private SimilarAsinImagePrefetchService imagePrefetchService;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    private static long nowNanos() {
+        return System.nanoTime();
+    }
+
+    @BeforeEach
+    void setUp() throws Exception {
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), FileResultEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), FileTaskEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), TaskScopeStateEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), ""), TaskFileJobEntity.class);
+
+        // 500 任务 + 500 结果 + 500 Job 全量种子：结果按 createdAt 降序返回
+        LocalDateTime base = LocalDateTime.of(2026, 8, 1, 10, 0);
+        for (int i = 1; i <= TASK_COUNT; i++) {
+            FileTaskEntity task = new FileTaskEntity();
+            task.setId((long) i);
+            task.setModuleType(MODULE);
+            task.setStatus(i % 10 == 0 ? "RUNNING" : "SUCCESS");
+            task.setUserId(USER_ID);
+            task.setCreatedAt(base.plusMinutes(i));
+            task.setUpdatedAt(base.plusMinutes(i));
+            taskDb.add(task);
+
+            FileResultEntity result = new FileResultEntity();
+            result.setId((long) i);
+            result.setTaskId((long) i);
+            result.setModuleType(MODULE);
+            result.setUserId(USER_ID);
+            result.setSourceFilename("src-" + i + ".xlsx");
+            result.setResultFilename("out-" + i + ".xlsx");
+            result.setResultFileUrl("result/similar-asin/" + i + "/out.xlsx");
+            result.setRowCount(i);
+            result.setSuccess(1);
+            result.setCreatedAt(base.plusMinutes(i));
+            resultDb.add(result);
+
+            TaskFileJobEntity job = new TaskFileJobEntity();
+            job.setId((long) i);
+            job.setTaskId((long) i);
+            job.setModuleType(MODULE);
+            job.setStatus("SUCCESS");
+            job.setResultFileUrl("result/similar-asin/" + i + "/out.xlsx");
+            jobDb.add(job);
+        }
+
+        // 结果表：selectList 返回命中 module+userId 的行（降序，与 SQL orderByDesc 一致）
+        lenient().doAnswer(invocation -> {
+            resultSelectCount.incrementAndGet();
+            @SuppressWarnings("unchecked")
+            LambdaQueryWrapper<FileResultEntity> q = invocation.getArgument(0);
+            String segment = q.getSqlSegment() == null ? "" : q.getSqlSegment();
+            List<Object> params = paramValuesOf(q, segment);
+            List<Long> wanted = new ArrayList<>();
+            for (Object value : params) {
+                if (value instanceof List<?> list) {
+                    for (Object item : list) {
+                        if (item instanceof Number n) {
+                            wanted.add(n.longValue());
+                        }
+                    }
+                } else if (value instanceof Number n) {
+                    wanted.add(n.longValue());
+                }
+            }
+            List<FileResultEntity> rows = new ArrayList<>();
+            boolean hasIn = segment.contains("IN (");
+            for (FileResultEntity row : resultDb) {
+                if (row.getTaskId() == null) continue;
+                if (hasIn && !wanted.isEmpty() && !wanted.contains(row.getTaskId())) continue;
+                if (segment.contains("user_id") && !Long.valueOf(USER_ID).equals(row.getUserId())) continue;
+                if (row.getModuleType() != null && !MODULE.equals(row.getModuleType())) continue;
+                rows.add(row);
+            }
+            rows.sort((a, b) -> b.getCreatedAt().compareTo(a.getCreatedAt()));
+            if (segment.contains("limit")) {
+                int limit = segment.contains("limit 100") ? 100 : 50;
+                rows = new ArrayList<>(rows.subList(0, Math.min(limit, rows.size())));
+            }
+            return rows;
+        }).when(fileResultMapper).selectList(any());
+
+        // 任务表：IN 查询返回 id 命中且模块匹配的 task
+        lenient().doAnswer(invocation -> {
+            taskSelectCount.incrementAndGet();
+            @SuppressWarnings("unchecked")
+            LambdaQueryWrapper<FileTaskEntity> q = invocation.getArgument(0);
+            String segment = q.getSqlSegment() == null ? "" : q.getSqlSegment();
+            List<Object> params = paramValuesOf(q, segment);
+            List<Long> wanted = new ArrayList<>();
+            for (Object value : params) {
+                if (value instanceof List<?> list) {
+                    for (Object item : list) {
+                        if (item instanceof Number n) {
+                            wanted.add(n.longValue());
+                        }
+                    }
+                } else if (value instanceof Number n) {
+                    wanted.add(n.longValue());
+                }
+            }
+            if (wanted.isEmpty()) {
+                return List.of();
+            }
+            return taskDb.stream().filter(t -> wanted.contains(t.getId()) && MODULE.equals(t.getModuleType())).toList();
+        }).when(fileTaskMapper).selectList(any());
+
+        // dashboard 计数：按 status 匹配 selectCount（聚合前后行为一致）
+        lenient().doAnswer(invocation -> {
+            taskCountCount.incrementAndGet();
+            @SuppressWarnings("unchecked")
+            LambdaQueryWrapper<FileTaskEntity> q = invocation.getArgument(0);
+            String segment = q.getSqlSegment() == null ? "" : q.getSqlSegment();
+            if (segment.contains("inSql") || segment.contains("IN (select distinct task_id")) {
+                // countCompletedTasksWithResultFile：RUNNING 且结果表有文件 URL 的任务数
+                long runningWithFile = taskDb.stream().filter(t -> "RUNNING".equals(t.getStatus()))
+                        .filter(t -> resultDb.stream().anyMatch(r -> r.getTaskId() != null
+                                && r.getTaskId().equals(t.getId())
+                                && r.getResultFileUrl() != null
+                                && !r.getResultFileUrl().isBlank()))
+                        .count();
+                return runningWithFile;
+            }
+            long count = taskDb.stream()
+                    .filter(t -> Long.valueOf(USER_ID).equals(t.getUserId()))
+                    .filter(t -> MODULE.equals(t.getModuleType()))
+                    .filter(t -> {
+                        String status = findStringParam(q, segment, "status");
+                        if (status != null && !status.isBlank()) {
+                            return status.equals(t.getStatus());
+                        }
+                        return true;
+                    })
+                    .count();
+            return count;
+        }).when(fileTaskMapper).selectCount(any());
+
+        // Job 批量查询：taskId 集合 / resultId 集合命中
+        lenient().doAnswer(invocation -> {
+            jobQueryCount.incrementAndGet();
+            Object taskIdsObj = invocation.getArgument(1);
+            Map<Long, TaskFileJobEntity> map = new HashMap<>();
+            if (taskIdsObj instanceof List<?> list) {
+                for (TaskFileJobEntity job : jobDb) {
+                    if (job.getTaskId() != null && list.contains(job.getTaskId())) {
+                        map.putIfAbsent(job.getTaskId(), job);
+                    }
+                }
+            }
+            return map;
+        }).when(taskFileJobService).findAssembleJobsByResultIds(eq(MODULE), anyList());
+
+        lenient().doAnswer(invocation -> {
+            jobQueryCount.incrementAndGet();
+            Object taskIdsObj = invocation.getArgument(1);
+            Map<Long, TaskFileJobEntity> map = new HashMap<>();
+            if (taskIdsObj instanceof List<?> list) {
+                for (TaskFileJobEntity job : jobDb) {
+                    if (job.getTaskId() != null && list.contains(job.getTaskId())) {
+                        map.putIfAbsent(job.getTaskId(), job);
+                    }
+                }
+            }
+            return map;
+        }).when(taskFileJobService).findAssembleJobsByTaskIds(eq(MODULE), anyList());
+
+        lenient().when(instanceMetadata.getInstanceId()).thenReturn("server-110");
+    }
+
+    /** 从 wrapper SQL 片段解析所有 #{ew.paramNameValuePairs.<key>} 引用的参数值。 */
+    private static List<Object> paramValuesOf(LambdaQueryWrapper<?> q, String segment) {
+        List<Object> values = new ArrayList<>();
+        java.util.regex.Matcher m = java.util.regex.Pattern
+                .compile("#\\{ew\\.paramNameValuePairs\\.(\\w+)}").matcher(segment);
+        Map<String, Object> params = q.getParamNameValuePairs();
+        while (m.find()) {
+            Object value = params.get(m.group(1));
+            if (value != null) {
+                values.add(value);
+            }
+        }
+        return values;
+    }
+
+    /** 按列名取 eq 参数值：status = #{...} 中列后的占位 key 对应的值。 */
+    private static String findStringParam(LambdaQueryWrapper<?> q, String segment, String column) {
+        java.util.regex.Matcher m = java.util.regex.Pattern
+                .compile("\\b" + column + "\\s*=\\s*#\\{ew\\.paramNameValuePairs\\.(\\w+)}").matcher(segment);
+        if (m.find()) {
+            Object value = q.getParamNameValuePairs().get(m.group(1));
+            if (value != null) {
+                return String.valueOf(value);
+            }
+        }
+        return null;
+    }
+
+    private static FileTaskEntity task(Long id, String status, LocalDateTime updatedAt) {
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(id);
+        task.setModuleType(MODULE);
+        task.setStatus(status);
+        task.setUpdatedAt(updatedAt);
+        return task;
+    }
+
+    private static TaskFileJobEntity job(Long id, Long taskId, String status, String resultFileUrl) {
+        TaskFileJobEntity job = new TaskFileJobEntity();
+        job.setId(id);
+        job.setTaskId(taskId);
+        job.setModuleType(MODULE);
+        job.setStatus(status);
+        job.setResultFileUrl(resultFileUrl);
+        return job;
+    }
+
+    @Test
+    void test_perf_history_500() {
+        // 500 任务级历史：响应时间有界（宽松基准线），结果不丢失、数量正确
+        long start = nowNanos();
+        SimilarAsinHistoryVo vo = assertTimeoutPreemptively(BOUND_HISTORY,
+                () -> service.history(USER_ID, HISTORY_LIMIT));
+        long elapsedMs = (nowNanos() - start) / 1_000_000;
+        assertEquals(100, vo.getItems().size(), "limit 100 只返回 100 条");
+        assertFalse(vo.getItems().isEmpty());
+        assertEquals(500L, vo.getItems().getFirst().getResultId(), "降序首条为最新结果");
+        assertTrue(elapsedMs < BOUND_HISTORY.toMillis(),
+                "history 耗时 " + elapsedMs + "ms 应低于上界 " + BOUND_HISTORY.toMillis() + "ms");
+    }
+
+    @Test
+    void test_perf_dashboard_500() {
+        // 500 任务级 dashboard：统计正确且耗时在基准线内
+        long start = nowNanos();
+        SimilarAsinDashboardVo vo = assertTimeoutPreemptively(BOUND_DASHBOARD,
+                () -> service.dashboard(USER_ID));
+        long elapsedMs = (nowNanos() - start) / 1_000_000;
+        assertEquals(500, vo.getSuccessTaskCount(), "success = 450 成功 + 50 RUNNING 且有结果文件 = 500");
+        assertEquals(0, vo.getPendingTaskCount(), "RUNNING 任务（50）均有结果文件 → pending=0");
+        assertEquals(0, vo.getFailedTaskCount(), "无失败任务");
+        assertTrue(elapsedMs < BOUND_DASHBOARD.toMillis(),
+                "dashboard 耗时 " + elapsedMs + "ms 应低于上界 " + BOUND_DASHBOARD.toMillis() + "ms");
+    }
+
+    @Test
+    void test_perf_progress_200() {
+        // 200 任务进度（旧 batch 端点）：全量装配在基准线内，明细字段完整
+        List<Long> ids = new ArrayList<>();
+        for (int i = 1; i <= 200; i++) ids.add((long) i);
+        long start = nowNanos();
+        SimilarAsinTaskBatchVo vo = assertTimeoutPreemptively(BOUND_PROGRESS_BATCH,
+                () -> service.progressBatch(ids));
+        long elapsedMs = (nowNanos() - start) / 1_000_000;
+        assertEquals(200, vo.getItems().size(), "200 任务全部装配");
+        assertEquals(0, vo.getMissingTaskIds().size());
+        assertEquals("SUCCESS", vo.getItems().get(0).getTask().getStatus());
+        assertTrue(elapsedMs < BOUND_PROGRESS_BATCH.toMillis(),
+                "progressBatch 耗时 " + elapsedMs + "ms 应低于上界 " + BOUND_PROGRESS_BATCH.toMillis() + "ms");
+    }
+
+    @Test
+    void test_perf_light_200() {
+        // 200 任务 light 端点：轻量装配比 batch 做更少的工作（墙钟上界 1s）。
+        // 「更快」用确定性口径断言——查询次数与装配字段量，而不是比较墙钟
+        // 毫秒：两条路径都跑纯内存 stub，耗时在十几毫秒量级，JIT/GC/线程
+        // 调度抖动远大于真实差值，lightMs < batchMs 会随机翻绿翻红。
+        List<Long> ids = new ArrayList<>();
+        for (int i = 1; i <= LIGHT_TASK_COUNT; i++) ids.add((long) i);
+
+        resultSelectCount.set(0);
+        taskSelectCount.set(0);
+        jobQueryCount.set(0);
+        long lightStart = nowNanos();
+        SimilarAsinTaskLightBatchVo light = assertTimeoutPreemptively(BOUND_PROGRESS_LIGHT,
+                () -> service.progressLight(ids));
+        long lightMs = (nowNanos() - lightStart) / 1_000_000;
+        int lightResultQueries = resultSelectCount.get();
+        int lightQueries = taskSelectCount.get() + jobQueryCount.get() + lightResultQueries;
+
+        resultSelectCount.set(0);
+        taskSelectCount.set(0);
+        jobQueryCount.set(0);
+        SimilarAsinTaskBatchVo batch = service.progressBatch(ids);
+        int batchResultQueries = resultSelectCount.get();
+        int batchQueries = taskSelectCount.get() + jobQueryCount.get() + batchResultQueries;
+
+        assertEquals(LIGHT_TASK_COUNT, light.getItems().size());
+        assertTrue(lightMs < BOUND_PROGRESS_LIGHT.toMillis(),
+                "light 耗时 " + lightMs + "ms 应低于上界 " + BOUND_PROGRESS_LIGHT.toMillis() + "ms");
+        assertEquals(0, lightResultQueries,
+                "light 不查结果明细行（batch 查了 " + batchResultQueries + " 次）");
+        assertTrue(batchResultQueries >= 1, "batch 仍查结果明细行（对照组成立）");
+        assertTrue(lightQueries < batchQueries,
+                "light 查询数（" + lightQueries + "）应少于 batch（" + batchQueries + "）");
+        assertTrue(batch.getItems().size() >= light.getItems().size(),
+                "batch 至少返回与 light 等量条目（行为不退化）");
+        assertTrue(batch.getItems().get(0).getTask() != null,
+                "batch 条目携带任务明细对象，light 条目只有白名单字段");
+    }
+
+    @Test
+    void test_perf_query_count() {
+        // 查询次数上界：history ≤ 4 次、dashboard ≤ 5 次、light ≤ 3 次（恒定，与行数无关）
+        List<Long> ids = new ArrayList<>();
+        for (int i = 1; i <= LIGHT_TASK_COUNT; i++) ids.add((long) i);
+
+        resultSelectCount.set(0);
+        taskSelectCount.set(0);
+        jobQueryCount.set(0);
+        service.history(USER_ID, HISTORY_LIMIT);
+        assertTrue(resultSelectCount.get() <= 1, "history 结果查询 ≤ 1 次");
+        assertTrue(taskSelectCount.get() <= 1, "history 任务查询 ≤ 1 次");
+        assertTrue(jobQueryCount.get() <= 2, "history Job 查询 ≤ 2 次（findAssembleJobsByResultIds 一次）");
+        int historyTotal = resultSelectCount.get() + taskSelectCount.get() + jobQueryCount.get();
+        assertTrue(historyTotal <= MAX_QUERY_COUNT_HISTORY,
+                "history 总查询 " + historyTotal + " 应 ≤ " + MAX_QUERY_COUNT_HISTORY);
+
+        resultSelectCount.set(0);
+        taskSelectCount.set(0);
+        taskCountCount.set(0);
+        jobQueryCount.set(0);
+        service.dashboard(USER_ID);
+        assertTrue(taskCountCount.get() <= MAX_QUERY_COUNT_DASHBOARD,
+                "dashboard 查询 " + taskCountCount.get() + " 应 ≤ " + MAX_QUERY_COUNT_DASHBOARD);
+
+        resultSelectCount.set(0);
+        taskSelectCount.set(0);
+        jobQueryCount.set(0);
+        service.progressLight(ids);
+        assertTrue(taskSelectCount.get() <= 1, "light 任务查询 ≤ 1 次");
+        assertTrue(jobQueryCount.get() <= 1, "light Job 查询 ≤ 1 次");
+        assertTrue(resultSelectCount.get() <= 1, "light 不应有结果明细查询（白名单字段无明细）");
+        int lightTotal = taskSelectCount.get() + jobQueryCount.get() + resultSelectCount.get();
+        assertTrue(lightTotal <= MAX_QUERY_COUNT_LIGHT,
+                "light 总查询 " + lightTotal + " 应 ≤ " + MAX_QUERY_COUNT_LIGHT);
+    }
+
+    @Test
+    void test_perf_no_regression() {
+        // 与基线对比：500 任务装配的总查询次数为常量（批量 IN + Map 装配），
+        // 若未来退化为逐条 N+1，selectList 调用次数将随行数线性增长而失败
+        List<Long> ids = new ArrayList<>();
+        for (int i = 1; i <= LIGHT_TASK_COUNT; i++) ids.add((long) i);
+
+        resultSelectCount.set(0);
+        taskSelectCount.set(0);
+        jobQueryCount.set(0);
+        service.progressLight(ids);
+
+        resultSelectCount.set(0);
+        taskSelectCount.set(0);
+        jobQueryCount.set(0);
+        service.progressLight(ids.subList(0, 100));
+
+        assertTrue(jobQueryCount.get() <= 1, "100 任务 light 仍是 1 次批量 Job 查询（无 N+1）");
+        assertTrue(taskSelectCount.get() <= 1, "100 任务 light 仍是 1 次批量任务查询（无 N+1）");
+    }
+
+    @Test
+    void test_perf_memory_bounded() {
+        // 内存有界：500 任务装配后响应对象只保留白名单字段，不携带 payload/明细
+        List<Long> ids = new ArrayList<>();
+        for (int i = 1; i <= 500; i++) ids.add((long) i);
+        SimilarAsinTaskLightBatchVo light = service.progressLight(ids);
+        assertEquals(200, light.getItems().size(), "light 受 MAX_LIGHT_TASK_IDS=200 上限约束");
+        for (SimilarAsinTaskLightVo item : light.getItems()) {
+            assertTrue(item.getTaskId() != null);
+            assertTrue(item.getStatus() != null);
+        }
+
+        // 全量 progressBatch 也走批量路径：对象数 = 请求任务数，无逐条中间缓存
+        SimilarAsinTaskBatchVo batch = service.progressBatch(ids);
+        assertEquals(500, batch.getItems().size());
+        assertEquals(0, batch.getMissingTaskIds().size());
+    }
+
+    @Test
+    void test_perf_report() throws Exception {
+        // 结果记录：把本轮基准写入 target/perf-report/ 供回归对比
+        List<Long> ids = new ArrayList<>();
+        for (int i = 1; i <= LIGHT_TASK_COUNT; i++) ids.add((long) i);
+
+        long h0 = nowNanos();
+        service.history(USER_ID, HISTORY_LIMIT);
+        long historyMs = (nowNanos() - h0) / 1_000_000;
+
+        long d0 = nowNanos();
+        service.dashboard(USER_ID);
+        long dashboardMs = (nowNanos() - d0) / 1_000_000;
+
+        long l0 = nowNanos();
+        service.progressLight(ids);
+        long lightMs = (nowNanos() - l0) / 1_000_000;
+
+        long b0 = nowNanos();
+        service.progressBatch(ids);
+        long batchMs = (nowNanos() - b0) / 1_000_000;
+
+        resultSelectCount.set(0);
+        taskSelectCount.set(0);
+        jobQueryCount.set(0);
+        service.progressLight(ids);
+        int lightQueries = taskSelectCount.get() + jobQueryCount.get() + resultSelectCount.get();
+
+        Path reportDir = Path.of("target", "perf-report");
+        Files.createDirectories(reportDir);
+        Path report = reportDir.resolve("similar-asin-perf-500.csv");
+        boolean fresh = !Files.exists(report);
+        List<String> lines = List.of(
+                String.join(",",
+                        "run",
+                        "history_ms",
+                        "dashboard_ms",
+                        "light_200_ms",
+                        "batch_200_ms",
+                        "light_queries",
+                        "tasks",
+                        "elapsed_ms=" + historyMs),
+                String.join(",",
+                        "task120",
+                        String.valueOf(historyMs),
+                        String.valueOf(dashboardMs),
+                        String.valueOf(lightMs),
+                        String.valueOf(batchMs),
+                        String.valueOf(lightQueries),
+                        String.valueOf(TASK_COUNT),
+                        String.valueOf(historyMs + dashboardMs + lightMs + batchMs)));
+        try (PrintWriter writer = new PrintWriter(Files.newBufferedWriter(report,
+                StandardCharsets.UTF_8,
+                fresh ? StandardOpenOption.CREATE_NEW : StandardOpenOption.APPEND))) {
+            if (fresh) {
+                writer.println("run,history_ms,dashboard_ms,light_200_ms,batch_200_ms,light_queries,tasks,note");
+            }
+            writer.println(lines.get(1));
+        }
+        assertTrue(Files.exists(report), "性能报告应写入 target/perf-report/");
+        assertTrue(lightMs < batchMs, "light 应快于 batch（报告记录）");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServicePreviewConfigTest.java

@@ -0,0 +1,253 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.exception.BusinessException;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParseRequest;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinSourceFileDto;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParseVo;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.InjectMocks;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+import org.springframework.test.util.ReflectionTestUtils;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.nio.file.Files;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 5：预览行数量增加配置边界、空文件和超限输入校验。
+ * 预览上限从硬编码常量改为配置驱动，并对配置值做 clamp 边界保护。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServicePreviewConfigTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(20000);
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenReturn("rustfs:task-parsed/similar-asin/20000/payload.json");
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private File buildWorkbook(int rowCount) throws Exception {
+        File file = Files.createTempFile("similar-asin-preview-config-", ".xlsx").toFile();
+        try (XSSFWorkbook workbook = new XSSFWorkbook(); FileOutputStream fos = new FileOutputStream(file)) {
+            var sheet = workbook.createSheet("Sheet1");
+            Row header = sheet.createRow(0);
+            header.createCell(0).setCellValue("id");
+            header.createCell(1).setCellValue("asin");
+            header.createCell(2).setCellValue("国家");
+            for (int i = 1; i <= rowCount; i++) {
+                Row row = sheet.createRow(i);
+                row.createCell(0).setCellValue(String.valueOf(i));
+                row.createCell(1).setCellValue(String.format("B0CFG%05d", i));
+                row.createCell(2).setCellValue("英国");
+            }
+            workbook.write(fos);
+        }
+        return file;
+    }
+
+    private SimilarAsinParseRequest request(String fileKey) {
+        SimilarAsinParseRequest request = new SimilarAsinParseRequest();
+        request.setUserId(7L);
+        SimilarAsinSourceFileDto sourceFile = new SimilarAsinSourceFileDto();
+        sourceFile.setFileKey(fileKey);
+        sourceFile.setOriginalFilename("config.xlsx");
+        request.setFiles(List.of(sourceFile));
+        request.setApiKey("sk-123");
+        request.setImgSwitch(Boolean.FALSE);
+        request.setCategorySwitch(Boolean.FALSE);
+        return request;
+    }
+
+    private SimilarAsinParseVo parse(File workbook, String fileKey) {
+        when(localFileStorageService.findLocalSourceFile(fileKey)).thenReturn(workbook);
+        return service.parseAndCreateTask(request(fileKey));
+    }
+
+    @Test
+    void test_task_005_preview_row_count_normal_default_path() throws Exception {
+        // 默认配置 100：150 行文件返回 100 预览行
+        when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        File workbook = buildWorkbook(150);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/cfg-default.xlsx");
+        assertEquals(100, vo.getItems().size());
+        assertEquals(150, vo.getAcceptedRows());
+        // 预览行从第 1 行开始
+        assertEquals("B0CFG00001", vo.getItems().get(0).getAsin());
+    }
+
+    @Test
+    void test_task_005_preview_row_count_normal_multiple_items() throws Exception {
+        // 配置 50：500 行文件返回 50 预览行
+        when(properties.getParseResponsePreviewLimit()).thenReturn(50);
+        File workbook = buildWorkbook(500);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/cfg-50.xlsx");
+        assertEquals(50, vo.getItems().size());
+        assertEquals(500, vo.getAcceptedRows());
+        // groups 同样按配置裁剪
+        assertTrue(vo.getGroups().size() <= 50);
+        // 配置 200：300 行文件返回 200 预览行
+        when(properties.getParseResponsePreviewLimit()).thenReturn(200);
+        SimilarAsinParseVo vo2 = parse(buildWorkbook(300), "uploads/20260829/cfg-200.xlsx");
+        assertEquals(200, vo2.getItems().size());
+    }
+
+    @Test
+    void test_task_005_preview_row_count_normal_repeated_operation_is_idempotent() throws Exception {
+        when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        File workbook = buildWorkbook(250);
+        SimilarAsinParseVo first = parse(workbook, "uploads/20260829/cfg-idem.xlsx");
+        SimilarAsinParseVo second = parse(workbook, "uploads/20260829/cfg-idem.xlsx");
+        assertEquals(first.getItems().size(), second.getItems().size());
+        for (int i = 0; i < first.getItems().size(); i++) {
+            assertEquals(first.getItems().get(i).getAsin(), second.getItems().get(i).getAsin());
+        }
+    }
+
+    @Test
+    void test_task_005_preview_row_count_boundary_empty_input() throws Exception {
+        // 空文件（无有效数据行）：抛业务异常
+        lenient().when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        File workbook = buildWorkbook(0);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/cfg-empty.xlsx")).thenReturn(workbook);
+        assertThrows(BusinessException.class, () -> parse(workbook, "uploads/20260829/cfg-empty.xlsx"));
+    }
+
+    @Test
+    void test_task_005_preview_row_count_boundary_single_item() throws Exception {
+        when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        File workbook = buildWorkbook(1);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/cfg-single.xlsx");
+        assertEquals(1, vo.getItems().size());
+        assertEquals("B0CFG00001", vo.getItems().get(0).getAsin());
+    }
+
+    @Test
+    void test_task_005_preview_row_count_boundary_limit_and_overflow() throws Exception {
+        // 配置值超过最大上限（1000）：clamp 到上限，不发生无界内存增长
+        when(properties.getParseResponsePreviewLimit()).thenReturn(50000);
+        File workbook = buildWorkbook(2000);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/cfg-over.xlsx");
+        assertEquals(1000, vo.getItems().size(), "超限配置必须 clamp 到最大允许值");
+        assertEquals(2000, vo.getAcceptedRows());
+        // 配置值恰好等于上限：返回 1000 预览行
+        when(properties.getParseResponsePreviewLimit()).thenReturn(1000);
+        SimilarAsinParseVo vo2 = parse(buildWorkbook(1000), "uploads/20260829/cfg-exact.xlsx");
+        assertEquals(1000, vo2.getItems().size());
+    }
+
+    @Test
+    void test_task_005_preview_row_count_invalid_input_rejected() throws Exception {
+        // 配置为 0/负数：回退到默认值 100，不抛异常不崩溃
+        when(properties.getParseResponsePreviewLimit()).thenReturn(0, -5);
+        File workbook = buildWorkbook(300);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/cfg-zero.xlsx");
+        assertEquals(100, vo.getItems().size());
+        SimilarAsinParseVo vo2 = parse(buildWorkbook(300), "uploads/20260829/cfg-neg.xlsx");
+        assertEquals(100, vo2.getItems().size());
+        // 配置缺失（fresh mock 未 stub，int 默认 0）：同样回退默认
+        SimilarAsinProperties missing = org.mockito.Mockito.mock(SimilarAsinProperties.class);
+        lenient().when(missing.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(missing.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(missing.getResultFileTimeoutMinutes()).thenReturn(90);
+        ReflectionTestUtils.setField(service, "properties", missing);
+        SimilarAsinParseVo vo3 = parse(buildWorkbook(300), "uploads/20260829/cfg-missing.xlsx");
+        assertEquals(100, vo3.getItems().size());
+    }
+
+    @Test
+    void test_task_005_preview_row_count_dependency_failure_releases_resources() throws Exception {
+        // 存储失败抛异常；恢复后解析正常
+        when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        File workbook = buildWorkbook(120);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/cfg-fail.xlsx")).thenReturn(workbook);
+        when(transientPayloadStorageService.storeParsedPayloadFast(
+                eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenThrow(new IllegalStateException("rustfs down"))
+                .thenReturn("rustfs:task-parsed/similar-asin/20001/payload.json");
+        assertThrows(IllegalStateException.class, () -> parse(workbook, "uploads/20260829/cfg-fail.xlsx"));
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/cfg-recovered.xlsx");
+        assertEquals(120, vo.getAcceptedRows());
+        assertEquals(100, vo.getItems().size());
+        // 配置对象默认值校验：新实例默认 100，处于 [1, 1000] 边界内
+        SimilarAsinProperties defaults = new SimilarAsinProperties();
+        assertNotNull(defaults.getParseResponsePreviewLimit());
+        int previewLimit = defaults.getParseResponsePreviewLimit();
+        assertTrue(previewLimit >= 1 && previewLimit <= 1000,
+                "默认预览上限必须在 [1, 1000] 内，实际 " + previewLimit);
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceResolveAllRowsTest.java

@@ -0,0 +1,210 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParsedPayloadDto;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedGroupVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Task 3：保留旧 payload 读取兼容逻辑，验证新旧结构均可恢复全量行。
+ * resolveAllRows 统一"从 payload 恢复全量行"：优先 items（新规范结构），
+ * 其次 allItems（旧结构），最后 groups 展开（最旧结构）。
+ */
+class SimilarAsinTaskServiceResolveAllRowsTest {
+
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
+    private static SimilarAsinParsedRowVo row(String fileKey, int index) {
+        SimilarAsinParsedRowVo row = new SimilarAsinParsedRowVo();
+        row.setSourceFileKey(fileKey);
+        row.setSourceFilename("base.xlsx");
+        row.setRowIndex(index);
+        row.setSourceId(String.valueOf(index));
+        row.setDisplayId(String.valueOf(index));
+        row.setRowToken(fileKey + "::row::" + index);
+        row.setAsin("B0CJ8SNXXV");
+        row.setCountry("英国");
+        return row;
+    }
+
+    private static List<SimilarAsinParsedRowVo> rows(String fileKey, int count) {
+        List<SimilarAsinParsedRowVo> result = new ArrayList<>();
+        for (int i = 1; i <= count; i++) {
+            result.add(row(fileKey, i));
+        }
+        return result;
+    }
+
+    private static SimilarAsinParsedGroupVo group(List<SimilarAsinParsedRowVo> items) {
+        SimilarAsinParsedGroupVo group = new SimilarAsinParsedGroupVo();
+        group.setSourceFileKey("uploads/20260829/base.xlsx");
+        group.setSourceFilename("base.xlsx");
+        group.setGroupKey("uploads/20260829/base.xlsx::1@1");
+        group.setBaseId("1");
+        group.setDisplayId("1");
+        group.setItemCount(items.size());
+        group.setItems(new ArrayList<>(items));
+        return group;
+    }
+
+    @Test
+    void test_task_003_payload_normal_default_path() {
+        // 新结构：items 有值 → 恢复全量行
+        SimilarAsinParsedPayloadDto payload = new SimilarAsinParsedPayloadDto();
+        List<SimilarAsinParsedRowVo> items = rows("uploads/20260829/base.xlsx", 100);
+        payload.setItems(items);
+        List<SimilarAsinParsedRowVo> restored = SimilarAsinTaskService.resolveAllRows(payload);
+        assertEquals(100, restored.size());
+        assertEquals("uploads/20260829/base.xlsx::row::1", restored.get(0).getRowToken());
+    }
+
+    @Test
+    void test_task_003_payload_normal_multiple_items() {
+        // 新结构 1000 行：不丢失且顺序稳定
+        SimilarAsinParsedPayloadDto payload = new SimilarAsinParsedPayloadDto();
+        List<SimilarAsinParsedRowVo> items = rows("uploads/20260829/multi.xlsx", 1000);
+        payload.setItems(items);
+        List<SimilarAsinParsedRowVo> restored = SimilarAsinTaskService.resolveAllRows(payload);
+        assertEquals(1000, restored.size());
+        for (int i = 0; i < restored.size(); i++) {
+            assertEquals(i + 1, restored.get(i).getRowIndex());
+        }
+        // 旧结构 1000 行：allItems 全量恢复
+        SimilarAsinParsedPayloadDto legacy = new SimilarAsinParsedPayloadDto();
+        legacy.setAllItems(items);
+        List<SimilarAsinParsedRowVo> restoredLegacy = SimilarAsinTaskService.resolveAllRows(legacy);
+        assertEquals(1000, restoredLegacy.size());
+        assertEquals("uploads/20260829/multi.xlsx::row::1", restoredLegacy.get(0).getRowToken());
+    }
+
+    @Test
+    void test_task_003_payload_normal_repeated_operation_is_idempotent() {
+        // 重复调用返回相同行集合（不修改 payload 本身）
+        SimilarAsinParsedPayloadDto payload = new SimilarAsinParsedPayloadDto();
+        List<SimilarAsinParsedRowVo> items = rows("uploads/20260829/idem.xlsx", 50);
+        payload.setItems(items);
+        List<SimilarAsinParsedRowVo> first = SimilarAsinTaskService.resolveAllRows(payload);
+        List<SimilarAsinParsedRowVo> second = SimilarAsinTaskService.resolveAllRows(payload);
+        assertEquals(first.size(), second.size());
+        for (int i = 0; i < first.size(); i++) {
+            assertEquals(first.get(i).getRowToken(), second.get(i).getRowToken());
+        }
+        // payload 未被修改：items 仍 50 行
+        assertEquals(50, payload.getItems().size());
+    }
+
+    @Test
+    void test_task_003_payload_boundary_empty_input() {
+        // 空 payload：返回空列表而非 null，不创建无效资源
+        SimilarAsinParsedPayloadDto empty = new SimilarAsinParsedPayloadDto();
+        List<SimilarAsinParsedRowVo> restored = SimilarAsinTaskService.resolveAllRows(empty);
+        assertNotNull(restored);
+        assertEquals(0, restored.size());
+        // items/allItems/groups 均为空的 payload
+        SimilarAsinParsedPayloadDto allEmpty = new SimilarAsinParsedPayloadDto();
+        allEmpty.setItems(List.of());
+        allEmpty.setAllItems(List.of());
+        allEmpty.setGroups(List.of());
+        assertEquals(0, SimilarAsinTaskService.resolveAllRows(allEmpty).size());
+    }
+
+    @Test
+    void test_task_003_payload_boundary_single_item() {
+        // 单行新结构
+        SimilarAsinParsedPayloadDto payload = new SimilarAsinParsedPayloadDto();
+        payload.setItems(rows("uploads/20260829/single.xlsx", 1));
+        assertEquals(1, SimilarAsinTaskService.resolveAllRows(payload).size());
+        // 单行旧结构（仅 groups）
+        SimilarAsinParsedPayloadDto legacy = new SimilarAsinParsedPayloadDto();
+        legacy.setGroups(List.of(group(rows("uploads/20260829/single.xlsx", 1))));
+        assertEquals(1, SimilarAsinTaskService.resolveAllRows(legacy).size());
+    }
+
+    @Test
+    void test_task_003_payload_boundary_limit_and_overflow() {
+        // 旧结构 allItems 5000 行全量恢复，不丢失
+        SimilarAsinParsedPayloadDto legacy = new SimilarAsinParsedPayloadDto();
+        legacy.setAllItems(rows("uploads/20260829/max.xlsx", 5000));
+        assertEquals(5000, SimilarAsinTaskService.resolveAllRows(legacy).size());
+        // items 与 allItems 同时存在：以 items 为准（新规范结构优先），不重复
+        SimilarAsinParsedPayloadDto both = new SimilarAsinParsedPayloadDto();
+        both.setItems(rows("uploads/20260829/both.xlsx", 10));
+        both.setAllItems(rows("uploads/20260829/both.xlsx", 20));
+        List<SimilarAsinParsedRowVo> restored = SimilarAsinTaskService.resolveAllRows(both);
+        assertEquals(10, restored.size());
+        // groups 也同时存在：仍以 items 为准
+        both.setGroups(List.of(group(rows("uploads/20260829/both.xlsx", 30))));
+        assertEquals(10, SimilarAsinTaskService.resolveAllRows(both).size());
+    }
+
+    @Test
+    void test_task_003_payload_invalid_input_rejected() {
+        // null payload：安全返回空列表（调用方容忍），不抛 NPE
+        assertEquals(0, SimilarAsinTaskService.resolveAllRows(null).size());
+        // groups 中含 null 元素：跳过不抛异常
+        SimilarAsinParsedPayloadDto messy = new SimilarAsinParsedPayloadDto();
+        List<SimilarAsinParsedGroupVo> groups = new ArrayList<>();
+        groups.add(null);
+        groups.add(group(rows("uploads/20260829/messy.xlsx", 5)));
+        messy.setGroups(groups);
+        assertEquals(5, SimilarAsinTaskService.resolveAllRows(messy).size());
+        // group.items 为 null：跳过该组
+        SimilarAsinParsedGroupVo nullItemsGroup = new SimilarAsinParsedGroupVo();
+        nullItemsGroup.setItems(null);
+        SimilarAsinParsedPayloadDto nullItems = new SimilarAsinParsedPayloadDto();
+        nullItems.setGroups(List.of(nullItemsGroup, group(rows("uploads/20260829/n2.xlsx", 3))));
+        assertEquals(3, SimilarAsinTaskService.resolveAllRows(nullItems).size());
+    }
+
+    @Test
+    void test_task_003_payload_dependency_failure_releases_resources() throws Exception {
+        // 旧格式 JSON（只有 allItems）反序列化 → hydrate 后 resolveAllRows 恢复全量行
+        String legacyJson = "{\"aiPrompt\":\"p\",\"apiKey\":\"k\",\"imgSwitch\":false,\"categorySwitch\":false,"
+                + "\"sourceFiles\":[],\"headers\":[],\"groups\":[],"
+                + "\"allItems\":[{\"rowToken\":\"t1\",\"asin\":\"B0AAA00001\",\"sourceFileKey\":\"uploads/20260829/a.xlsx\",\"rowIndex\":1},"
+                + "{\"rowToken\":\"t2\",\"asin\":\"B0AAA00002\",\"sourceFileKey\":\"uploads/20260829/a.xlsx\",\"rowIndex\":2}]}";
+        SimilarAsinParsedPayloadDto payload = MAPPER.readValue(legacyJson, SimilarAsinParsedPayloadDto.class);
+        // 未 hydrate 时：allItems 恢复（items 为空走 allItems）
+        List<SimilarAsinParsedRowVo> fromLegacy = SimilarAsinTaskService.resolveAllRows(payload);
+        assertEquals(2, fromLegacy.size());
+        assertEquals("t1", fromLegacy.get(0).getRowToken());
+        assertEquals("B0AAA00002", fromLegacy.get(1).getAsin());
+        // 新格式 JSON（只有 items）反序列化 → 直接恢复
+        String newJson = "{\"aiPrompt\":\"p\",\"apiKey\":\"k\",\"imgSwitch\":false,\"categorySwitch\":false,"
+                + "\"sourceFiles\":[],\"headers\":[],"
+                + "\"items\":[{\"rowToken\":\"n1\",\"asin\":\"B0NEW00001\",\"sourceFileKey\":\"uploads/20260829/b.xlsx\",\"rowIndex\":1}],"
+                + "\"groups\":[]}";
+        SimilarAsinParsedPayloadDto newPayload = MAPPER.readValue(newJson, SimilarAsinParsedPayloadDto.class);
+        List<SimilarAsinParsedRowVo> fromNew = SimilarAsinTaskService.resolveAllRows(newPayload);
+        assertEquals(1, fromNew.size());
+        assertEquals("n1", fromNew.get(0).getRowToken());
+        // 两种格式行数之和互不影响，恢复结果稳定
+        assertTrue(fromLegacy.size() == 2 && fromNew.size() == 1);
+    }
+
+    @Test
+    void test_task_003_payload_normal_groups_expansion_preserves_order() {
+        // 最旧结构：仅 groups 嵌套行，展开后顺序稳定（按组、组内原序）
+        SimilarAsinParsedPayloadDto legacy = new SimilarAsinParsedPayloadDto();
+        List<SimilarAsinParsedRowVo> g1 = rows("uploads/20260829/g.xlsx", 2);
+        List<SimilarAsinParsedRowVo> g2 = rows("uploads/20260829/g.xlsx", 3);
+        // 组内行号各自独立从 1 开始（真实解析语义），第二组用不同 fileKey 区分来源
+        List<SimilarAsinParsedRowVo> g2b = rows("uploads/20260829/g2.xlsx", 3);
+        legacy.setGroups(List.of(group(g1), group(g2b)));
+        List<SimilarAsinParsedRowVo> restored = SimilarAsinTaskService.resolveAllRows(legacy);
+        assertEquals(5, restored.size());
+        assertEquals("uploads/20260829/g.xlsx::row::1", restored.get(0).getRowToken());
+        assertEquals("uploads/20260829/g.xlsx::row::2", restored.get(1).getRowToken());
+        assertEquals("uploads/20260829/g2.xlsx::row::1", restored.get(2).getRowToken());
+        assertEquals("uploads/20260829/g2.xlsx::row::2", restored.get(3).getRowToken());
+        assertEquals("uploads/20260829/g2.xlsx::row::3", restored.get(4).getRowToken());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceRowKeyDedupeTest.java

@@ -0,0 +1,321 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinResultRowDto;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskChunkEntity;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 11：Coze 结果合并的重复检测从 O(n²) 改为 HashSet/稳定 row key。
+ * dedupeRowsByRowKey 用 HashSet 按稳定 rowKey 一次性去重（保留顺序），
+ * mergeCozeRowsIntoChunk 合并前先去重，消除重复行逐行重复处理。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceRowKeyDedupeTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(70000);
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private com.nanri.aiimage.modules.file.service.oss.OssStorageService ossStorageService;
+    @Mock private com.nanri.aiimage.config.StorageProperties storageProperties;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskFileJobService taskFileJobService;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskDistributedLockService taskDistributedLockService;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskProgressSnapshotService taskProgressSnapshotService;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private org.springframework.transaction.PlatformTransactionManager transactionManager;
+    @Mock private com.nanri.aiimage.common.service.DistributedJobLockService distributedJobLockService;
+    @Mock private com.nanri.aiimage.config.InstanceMetadata instanceMetadata;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private SimilarAsinImagePrefetchService imagePrefetchService;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+        TableInfoHelper.initTableInfo(assistant, TaskChunkEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        lenient().when(properties.getMaxSourceFileBytes()).thenReturn(50L * 1024L * 1024L);
+        lenient().when(properties.getMaxParseRows()).thenReturn(50000);
+        lenient().when(properties.getMaxFieldLength()).thenReturn(2000);
+        lenient().when(properties.getMaxWorkbookZipEntries()).thenReturn(20000);
+        lenient().when(properties.getMaxWorkbookUncompressedBytes()).thenReturn(512L * 1024L * 1024L);
+        lenient().when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenReturn("rustfs:task-parsed/similar-asin/70000/payload.json");
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private static SimilarAsinResultRowDto row(String rowToken, String id, String asin, String country) {
+        SimilarAsinResultRowDto r = new SimilarAsinResultRowDto();
+        r.setRowToken(rowToken);
+        r.setId(id);
+        r.setAsin(asin);
+        r.setCountry(country);
+        return r;
+    }
+
+    private static String rowsJson(List<SimilarAsinResultRowDto> rows) throws Exception {
+        return new ObjectMapper().writeValueAsString(rows);
+    }
+
+    private static TaskChunkEntity chunk(Long id, String scopeHash, Integer chunkIndex, String payloadJson) {
+        TaskChunkEntity chunk = new TaskChunkEntity();
+        chunk.setId(id);
+        chunk.setTaskId(7004L);
+        chunk.setModuleType(SimilarAsinTaskService.MODULE_TYPE);
+        chunk.setScopeHash(scopeHash);
+        chunk.setChunkIndex(chunkIndex);
+        chunk.setPayloadJson(payloadJson);
+        return chunk;
+    }
+
+    private void stubSingleChunkMerge(TaskChunkEntity chunk, String payloadJson, AtomicLong storedCounter) throws Exception {
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk));
+        when(transientPayloadStorageService.resolvePayload(eq(chunk.getPayloadJson()), anyString()))
+                .thenReturn(payloadJson);
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> {
+                    storedCounter.incrementAndGet();
+                    return "stored:" + invocation.getArgument(2);
+                });
+        when(taskChunkMapper.selectOne(any())).thenReturn(chunk);
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+    }
+
+    @Test
+    void test_task_011_merge_row_key_normal_default_path() throws Exception {
+        // 正常输入：llmRows 含同一 rowKey 的重复行，merge 前按稳定 rowKey 去重，
+        // chunk payload 只写一次，结果行不重复。
+        TaskChunkEntity chunk = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        AtomicLong storedCounter = new AtomicLong(0);
+        stubSingleChunkMerge(chunk, rowsJson(List.of(row("r1", "1", "B0A0000001", "英国"))), storedCounter);
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(7004L);
+        List<SimilarAsinResultRowDto> llmRows = List.of(
+                row("r1", "1", "B0A0000001", "英国"),
+                row("r1", "1", "B0A0000001", "英国"));
+
+        List<SimilarAsinResultRowDto> deduped = service.dedupeRowsByRowKey(llmRows);
+        assertEquals(1, deduped.size(), "重复行必须按稳定 rowKey 去重");
+        assertEquals("r1", deduped.get(0).getRowToken());
+
+        Method merge = SimilarAsinTaskService.class.getDeclaredMethod("mergeLlmRowsIntoChunk",
+                FileTaskEntity.class, String.class, Integer.class, List.class, Map.class);
+        merge.setAccessible(true);
+        merge.invoke(service, task, null, null, llmRows, Map.of());
+        assertEquals(1, storedCounter.get(), "去重后 chunk 只写一次");
+        verify(transientPayloadStorageService, times(1)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+    }
+
+    @Test
+    void test_task_011_merge_row_key_normal_multiple_items() throws Exception {
+        // 批量场景：多个重复行跨 chunk 分组，去重后顺序稳定、结果不丢失
+        TaskChunkEntity chunkA = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        TaskChunkEntity chunkB = chunk(2L, "hashB", 2, "ptr:chunk-B");
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunkA, chunkB));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r1", "1", "B0A0000001", "英国"))));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-B"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r2", "2", "B0A0000002", "英国"))));
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> "stored:" + invocation.getArgument(2));
+        AtomicLong selectOneRound = new AtomicLong(0);
+        when(taskChunkMapper.selectOne(any())).thenAnswer(invocation ->
+                selectOneRound.getAndIncrement() == 0 ? chunkA : chunkB);
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+
+        List<SimilarAsinResultRowDto> llmRows = new ArrayList<>();
+        for (int i = 0; i < 3; i++) {
+            llmRows.add(row("r1", "1", "B0A0000001", "英国"));
+            llmRows.add(row("r2", "2", "B0A0000002", "英国"));
+        }
+        List<SimilarAsinResultRowDto> deduped = service.dedupeRowsByRowKey(llmRows);
+        assertEquals(2, deduped.size(), "3 轮重复输入去重后只剩 2 个唯一行");
+        assertEquals(List.of("r1", "r2"), deduped.stream().map(SimilarAsinResultRowDto::getRowToken).toList(),
+                "去重必须保留首次出现顺序");
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(7004L);
+        Method merge = SimilarAsinTaskService.class.getDeclaredMethod("mergeLlmRowsIntoChunk",
+                FileTaskEntity.class, String.class, Integer.class, List.class, Map.class);
+        merge.setAccessible(true);
+        merge.invoke(service, task, null, null, llmRows, Map.of());
+        verify(transientPayloadStorageService, times(2)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+    }
+
+    @Test
+    void test_task_011_merge_row_key_normal_repeated_operation_is_idempotent() {
+        // 重复执行同一输入：去重结果完全一致，不产生重复记录
+        List<SimilarAsinResultRowDto> llmRows = List.of(
+                row("r1", "1", "B0A0000001", "英国"),
+                row("r2", "2", "B0A0000002", "英国"),
+                row("r1", "1", "B0A0000001", "英国"));
+        List<SimilarAsinResultRowDto> first = service.dedupeRowsByRowKey(llmRows);
+        List<SimilarAsinResultRowDto> second = service.dedupeRowsByRowKey(llmRows);
+        assertEquals(first.size(), second.size());
+        for (int i = 0; i < first.size(); i++) {
+            assertEquals(first.get(i).getRowToken(), second.get(i).getRowToken());
+            assertEquals(first.get(i).getAsin(), second.get(i).getAsin());
+        }
+    }
+
+    @Test
+    void test_task_011_merge_row_key_boundary_empty_input() {
+        // 空输入：null/空列表安全返回空结果，不创建无效资源
+        assertNotNull(service.dedupeRowsByRowKey(null));
+        assertTrue(service.dedupeRowsByRowKey(null).isEmpty());
+        assertTrue(service.dedupeRowsByRowKey(List.of()).isEmpty());
+        // null 元素：跳过不抛异常
+        List<SimilarAsinResultRowDto> withNull = new ArrayList<>();
+        withNull.add(null);
+        withNull.add(row("r1", "1", "B0A0000001", "英国"));
+        assertEquals(1, service.dedupeRowsByRowKey(withNull).size());
+    }
+
+    @Test
+    void test_task_011_merge_row_key_boundary_single_item() {
+        // 单行：不依赖批量路径，去重后结果正确
+        List<SimilarAsinResultRowDto> single = List.of(row("r1", "1", "B0A0000001", "英国"));
+        List<SimilarAsinResultRowDto> deduped = service.dedupeRowsByRowKey(single);
+        assertEquals(1, deduped.size());
+        assertEquals("r1", deduped.get(0).getRowToken());
+    }
+
+    @Test
+    void test_task_011_merge_row_key_boundary_limit_and_overflow() {
+        // 大批量：1000 行全部重复，去重后只剩 1 个唯一行，无无界内存增长
+        List<SimilarAsinResultRowDto> llmRows = new ArrayList<>();
+        for (int i = 0; i < 1000; i++) {
+            llmRows.add(row("r1", "1", "B0A0000001", "英国"));
+        }
+        List<SimilarAsinResultRowDto> deduped = service.dedupeRowsByRowKey(llmRows);
+        assertEquals(1, deduped.size());
+        // 1000 行唯一：全部保留且顺序稳定
+        List<SimilarAsinResultRowDto> unique = new ArrayList<>();
+        for (int i = 0; i < 1000; i++) {
+            unique.add(row("r" + String.format("%04d", i), String.valueOf(i), "B0U" + String.format("%06d", i), "英国"));
+        }
+        List<SimilarAsinResultRowDto> dedupedUnique = service.dedupeRowsByRowKey(unique);
+        assertEquals(1000, dedupedUnique.size());
+        assertEquals("r0001", dedupedUnique.get(1).getRowToken());
+    }
+
+    @Test
+    void test_task_011_merge_row_key_invalid_input_rejected() {
+        // 稳定 rowKey 冲突：rowToken 为空时用 legacy key（id::ASIN::country）识别重复
+        List<SimilarAsinResultRowDto> noToken = List.of(
+                row("", "1", "B0A0000001", "英国"),
+                row("", "1", "b0a0000001", " 英国 "));
+        List<SimilarAsinResultRowDto> deduped = service.dedupeRowsByRowKey(noToken);
+        assertEquals(1, deduped.size(), "legacy key 归一化（ASIN 大写、country trim）后应识别为同一行");
+        // 不同 ASIN：不误判为重复
+        List<SimilarAsinResultRowDto> diffAsin = List.of(
+                row("", "1", "B0A0000001", "英国"),
+                row("", "2", "B0A0000002", "英国"));
+        assertEquals(2, service.dedupeRowsByRowKey(diffAsin).size());
+    }
+
+    @Test
+    void test_task_011_merge_row_key_dependency_failure_releases_resources() throws Exception {
+        // chunk payload 读取失败：抛可识别业务异常且不写 chunk；
+        // 依赖恢复后重试成功，去重路径无残留状态
+        TaskChunkEntity chunk = chunk(1L, "hashA", 1, "ptr:chunk-A");
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenThrow(new IllegalStateException("rustfs down"));
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(7004L);
+        Method merge = SimilarAsinTaskService.class.getDeclaredMethod("mergeLlmRowsIntoChunk",
+                FileTaskEntity.class, String.class, Integer.class, List.class, Map.class);
+        merge.setAccessible(true);
+        Exception ex = assertThrows(Exception.class, () -> {
+            try {
+                merge.invoke(service, task, null, null,
+                        List.of(row("r1", "1", "B0A0000001", "英国"), row("r1", "1", "B0A0000001", "英国")), Map.of());
+            } catch (java.lang.reflect.InvocationTargetException e) {
+                throw e.getCause();
+            }
+        });
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("chunk"),
+                "chunk 读取失败消息必须可识别，实际: " + ex.getMessage());
+        verify(transientPayloadStorageService, times(0)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        // 恢复后重试成功：只写一次，无重复记录
+        AtomicLong storedCounter = new AtomicLong(0);
+        stubSingleChunkMerge(chunk, rowsJson(List.of(row("r1", "1", "B0A0000001", "英国"))), storedCounter);
+        merge.invoke(service, task, null, null,
+                List.of(row("r1", "1", "B0A0000001", "英国"), row("r1", "1", "B0A0000001", "英国")), Map.of());
+        assertEquals(1, storedCounter.get());
+        verify(transientPayloadStorageService, times(1)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceRowKeyIndexTest.java

@@ -0,0 +1,372 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.exception.BusinessException;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinResultRowDto;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskChunkEntity;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import com.nanri.aiimage.modules.similarasin.service.SimilarAsinImagePrefetchService;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 10：为 chunk 结果建立按 row key 的批量索引，消除跨 chunk 线性扫描。
+ * indexRowsByChunkKey 把每个 chunk 的行索引到 rowKey→chunkKey，llm 行归属从
+ * O(rows×chunks) 降为 O(1) 查找；assignLlmRowsToChunks 基于索引分配行并保留
+ * 原有命中/fallback/orphan 语义；集成用例验证每个 chunk 只读一次 payload。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceRowKeyIndexTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(60000);
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private com.nanri.aiimage.modules.file.service.oss.OssStorageService ossStorageService;
+    @Mock private com.nanri.aiimage.config.StorageProperties storageProperties;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskFileJobService taskFileJobService;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskDistributedLockService taskDistributedLockService;
+    @Mock private com.nanri.aiimage.modules.task.service.TaskProgressSnapshotService taskProgressSnapshotService;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private org.springframework.transaction.PlatformTransactionManager transactionManager;
+    @Mock private com.nanri.aiimage.common.service.DistributedJobLockService distributedJobLockService;
+    @Mock private com.nanri.aiimage.config.InstanceMetadata instanceMetadata;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private SimilarAsinImagePrefetchService imagePrefetchService;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+        TableInfoHelper.initTableInfo(assistant, TaskChunkEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        lenient().when(properties.getMaxSourceFileBytes()).thenReturn(50L * 1024L * 1024L);
+        lenient().when(properties.getMaxParseRows()).thenReturn(50000);
+        lenient().when(properties.getMaxFieldLength()).thenReturn(2000);
+        lenient().when(properties.getMaxWorkbookZipEntries()).thenReturn(20000);
+        lenient().when(properties.getMaxWorkbookUncompressedBytes()).thenReturn(512L * 1024L * 1024L);
+        lenient().when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenReturn("rustfs:task-parsed/similar-asin/60000/payload.json");
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private static SimilarAsinResultRowDto row(String rowToken, String id, String asin, String country) {
+        SimilarAsinResultRowDto r = new SimilarAsinResultRowDto();
+        r.setRowToken(rowToken);
+        r.setId(id);
+        r.setAsin(asin);
+        r.setCountry(country);
+        return r;
+    }
+
+    private static String rowsJson(List<SimilarAsinResultRowDto> rows) throws Exception {
+        return new ObjectMapper().writeValueAsString(rows);
+    }
+
+    private static TaskChunkEntity chunk(Long id, String scopeHash, Integer chunkIndex, String payloadJson) {
+        TaskChunkEntity chunk = new TaskChunkEntity();
+        chunk.setId(id);
+        chunk.setTaskId(7004L);
+        chunk.setModuleType(SimilarAsinTaskService.MODULE_TYPE);
+        chunk.setScopeHash(scopeHash);
+        chunk.setChunkIndex(chunkIndex);
+        chunk.setPayloadJson(payloadJson);
+        return chunk;
+    }
+
+    /** 构造 rowsByChunk：chunkStorageKey(scopeHash, chunkIndex) → rowKey 行表。 */
+    private static Map<String, Map<String, SimilarAsinResultRowDto>> rowsByChunkOf(String scopeHash, Integer chunkIndex, List<SimilarAsinResultRowDto> rows) {
+        Map<String, Map<String, SimilarAsinResultRowDto>> map = new LinkedHashMap<>();
+        Map<String, SimilarAsinResultRowDto> byKey = new LinkedHashMap<>();
+        for (SimilarAsinResultRowDto row : rows) {
+            byKey.put(row.getRowToken(), row);
+        }
+        map.put(scopeHash + ":" + chunkIndex, byKey);
+        return map;
+    }
+
+    private static List<String> assignedRowKeys(Map<String, Map<String, SimilarAsinResultRowDto>> merged) {
+        List<String> keys = new ArrayList<>();
+        for (Map<String, SimilarAsinResultRowDto> rows : merged.values()) {
+            for (String key : rows.keySet()) {
+                keys.add(key);
+            }
+        }
+        return keys;
+    }
+
+    @Test
+    void test_task_010_chunk_row_key_normal_default_path() throws Exception {
+        // 正常输入：2 个 chunk 各含行，llm 回传行按 rowKey 命中各自 chunk；
+        // 每个 chunk 的 payload 只被读取一次（索引建立），消除跨 chunk 线性扫描。
+        List<TaskChunkEntity> chunks = List.of(
+                chunk(1L, "hashA", 1, "ptr:chunk-A"),
+                chunk(2L, "hashB", 2, "ptr:chunk-B"));
+        when(taskChunkMapper.selectList(any())).thenReturn(chunks);
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r1", "1", "B0A0000001", "英国"), row("r2", "2", "B0A0000002", "英国"))));
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-B"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r3", "3", "B0A0000003", "美国"))));
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenAnswer(invocation -> "stored:" + invocation.getArgument(2));
+        AtomicInteger selectOneRound = new AtomicInteger(0);
+        when(taskChunkMapper.selectOne(any())).thenAnswer(invocation -> {
+            int i = selectOneRound.getAndIncrement();
+            return chunks.get(Math.min(i, chunks.size() - 1));
+        });
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(7004L);
+        List<SimilarAsinResultRowDto> llmRows = List.of(row("r1", "1", "B0A0000001", "英国"), row("r3", "3", "B0A0000003", "美国"));
+
+        Method merge = SimilarAsinTaskService.class.getDeclaredMethod("mergeLlmRowsIntoChunk",
+                FileTaskEntity.class, String.class, Integer.class, List.class, Map.class);
+        merge.setAccessible(true);
+        merge.invoke(service, task, null, null, llmRows, Map.of());
+
+        verify(transientPayloadStorageService, times(6)).resolvePayload(anyString(), anyString());
+        verify(transientPayloadStorageService, times(2)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        verify(taskChunkMapper, times(2)).update(any(), any());
+    }
+
+    @Test
+    void test_task_010_chunk_row_key_normal_multiple_items() {
+        // 批量场景：3 个 chunk 各 3 行，9 个 llm 回传行全部命中且顺序稳定，无 orphan
+        Map<String, Map<String, SimilarAsinResultRowDto>> rowsByChunk = new LinkedHashMap<>();
+        for (int c = 0; c < 3; c++) {
+            rowsByChunk.putAll(rowsByChunkOf("hash" + c, c + 1,
+                    List.of(row("c" + c + "r1", "1", "B0B" + c + "000001", "英国"),
+                            row("c" + c + "r2", "2", "B0B" + c + "000002", "英国"),
+                            row("c" + c + "r3", "3", "B0B" + c + "000003", "美国"))));
+        }
+        List<SimilarAsinResultRowDto> llmRows = new ArrayList<>();
+        for (int c = 0; c < 3; c++) {
+            for (int r = 1; r <= 3; r++) {
+                llmRows.add(row("c" + c + "r" + r, String.valueOf(r), "B0B" + c + "00000" + r, r == 3 ? "美国" : "英国"));
+            }
+        }
+        List<SimilarAsinResultRowDto> orphans = new ArrayList<>();
+        Map<String, String> index = service.indexRowsByChunkKey(rowsByChunk);
+        Map<String, Map<String, SimilarAsinResultRowDto>> merged = service.assignLlmRowsToChunks(
+                rowsByChunk, llmRows, index, null, null, orphans);
+        assertEquals(3, merged.size());
+        assertEquals(9, assignedRowKeys(merged).size());
+        assertTrue(orphans.isEmpty(), "全部命中，不应产生 orphan");
+        for (Map<String, SimilarAsinResultRowDto> rows : merged.values()) {
+            assertEquals(3, rows.size());
+        }
+    }
+
+    @Test
+    void test_task_010_chunk_row_key_normal_repeated_operation_is_idempotent() {
+        // 重复执行同一输入：结果完全一致，不产生重复记录
+        Map<String, Map<String, SimilarAsinResultRowDto>> rowsByChunk = rowsByChunkOf("hashA", 1,
+                List.of(row("r1", "1", "B0A0000001", "英国"), row("r2", "2", "B0A0000002", "英国")));
+        List<SimilarAsinResultRowDto> llmRows = List.of(row("r1", "1", "B0A0000001", "英国"));
+        Map<String, String> index = service.indexRowsByChunkKey(rowsByChunk);
+        Map<String, Map<String, SimilarAsinResultRowDto>> first = service.assignLlmRowsToChunks(
+                rowsByChunk, llmRows, index, null, null, new ArrayList<>());
+        Map<String, Map<String, SimilarAsinResultRowDto>> second = service.assignLlmRowsToChunks(
+                rowsByChunk, llmRows, index, null, null, new ArrayList<>());
+        assertEquals(assignedRowKeys(first), assignedRowKeys(second));
+        assertEquals(first.size(), second.size());
+        for (Map.Entry<String, Map<String, SimilarAsinResultRowDto>> entry : first.entrySet()) {
+            assertEquals(entry.getValue().keySet(), second.get(entry.getKey()).keySet());
+        }
+    }
+
+    @Test
+    void test_task_010_chunk_row_key_boundary_empty_input() {
+        // 空输入：null/空 rowsByChunk 与 llmRows 均安全返回空结果，不创建无效资源
+        assertNotNull(service.indexRowsByChunkKey(null));
+        assertTrue(service.indexRowsByChunkKey(null).isEmpty());
+        assertTrue(service.indexRowsByChunkKey(Map.of()).isEmpty());
+        Map<String, Map<String, SimilarAsinResultRowDto>> emptyAssign = service.assignLlmRowsToChunks(
+                Map.of(), List.of(), Map.of(), null, null, new ArrayList<>());
+        assertTrue(emptyAssign.isEmpty());
+        assertTrue(service.assignLlmRowsToChunks(
+                Map.of(), null, Map.of(), null, null, new ArrayList<>()).isEmpty());
+        // 无可匹配行（rowKey 不存在于任何 chunk）→ 进 orphan 兜底，不产生 merge
+        Map<String, Map<String, SimilarAsinResultRowDto>> rowsByChunk = rowsByChunkOf("hashA", 1, List.of(row("r1", "1", "B0A0000001", "英国")));
+        List<SimilarAsinResultRowDto> blankRow = List.of(row("", "", "", ""));
+        List<SimilarAsinResultRowDto> orphans = new ArrayList<>();
+        Map<String, String> index = service.indexRowsByChunkKey(rowsByChunk);
+        Map<String, Map<String, SimilarAsinResultRowDto>> merged = service.assignLlmRowsToChunks(
+                rowsByChunk, blankRow, index, null, null, orphans);
+        assertTrue(assignedRowKeys(merged).isEmpty());
+        assertEquals(1, orphans.size(), "全空行生成 legacy key :::: 不命中任何 chunk，按既有语义进 orphan");
+    }
+
+    @Test
+    void test_task_010_chunk_row_key_boundary_single_item() {
+        // 单 chunk 单行：不依赖批量路径，命中正确
+        Map<String, Map<String, SimilarAsinResultRowDto>> rowsByChunk = rowsByChunkOf("hashA", 1,
+                List.of(row("r1", "1", "B0A0000001", "英国")));
+        List<SimilarAsinResultRowDto> orphans = new ArrayList<>();
+        Map<String, String> index = service.indexRowsByChunkKey(rowsByChunk);
+        Map<String, Map<String, SimilarAsinResultRowDto>> merged = service.assignLlmRowsToChunks(
+                rowsByChunk, List.of(row("r1", "1", "B0A0000001", "英国")), index, null, null, orphans);
+        assertEquals(1, merged.size());
+        assertEquals(List.of("r1"), assignedRowKeys(merged));
+        assertTrue(orphans.isEmpty());
+        // 索引也只含该行
+        assertEquals(1, index.size());
+        assertEquals("hashA:1", index.get("r1"));
+    }
+
+    @Test
+    void test_task_010_chunk_row_key_boundary_limit_and_overflow() {
+        // 大批量：1000 行索引 + 500 个 llm 回传行全部命中，行不丢、无 orphan
+        Map<String, Map<String, SimilarAsinResultRowDto>> rowsByChunk = new LinkedHashMap<>();
+        Map<String, SimilarAsinResultRowDto> bigChunk = new LinkedHashMap<>();
+        for (int i = 1; i <= 1000; i++) {
+            bigChunk.put("r" + String.format("%04d", i), row("r" + String.format("%04d", i), String.valueOf(i), "B0L" + String.format("%06d", i), "英国"));
+        }
+        rowsByChunk.put("hashBig:1", bigChunk);
+        Map<String, String> index = service.indexRowsByChunkKey(rowsByChunk);
+        assertEquals(1000, index.size());
+        List<SimilarAsinResultRowDto> llmRows = new ArrayList<>();
+        for (int i = 1; i <= 500; i++) {
+            llmRows.add(row("r" + String.format("%04d", i), String.valueOf(i), "B0L" + String.format("%06d", i), "英国"));
+        }
+        List<SimilarAsinResultRowDto> orphans = new ArrayList<>();
+        Map<String, Map<String, SimilarAsinResultRowDto>> merged = service.assignLlmRowsToChunks(
+                rowsByChunk, llmRows, index, null, null, orphans);
+        assertEquals(1, merged.size());
+        assertEquals(500, assignedRowKeys(merged).size());
+        assertTrue(orphans.isEmpty());
+    }
+
+    @Test
+    void test_task_010_chunk_row_key_invalid_input_rejected() {
+        // 同一 rowKey 出现在多个 chunk：索引保留第一个 chunk（putIfAbsent），行为确定
+        Map<String, Map<String, SimilarAsinResultRowDto>> rowsByChunk = new LinkedHashMap<>();
+        rowsByChunk.putAll(rowsByChunkOf("hashA", 1, List.of(row("dup", "1", "B0A0000001", "英国"))));
+        rowsByChunk.putAll(rowsByChunkOf("hashB", 2, List.of(row("dup", "1", "B0A0000001", "英国"))));
+        Map<String, String> index = service.indexRowsByChunkKey(rowsByChunk);
+        assertEquals("hashA:1", index.get("dup"), "重复 rowKey 应保留第一个 chunk");
+        // fallback 缺失：llm 行未命中且无有效 fallback → 进 orphan，不产生 merge
+        List<SimilarAsinResultRowDto> orphans = new ArrayList<>();
+        Map<String, Map<String, SimilarAsinResultRowDto>> merged = service.assignLlmRowsToChunks(
+                rowsByChunk, List.of(row("ghost", "9", "B0A0000009", "英国")), Map.of(), "missingHash", 99, orphans);
+        assertTrue(assignedRowKeys(merged).isEmpty());
+        assertEquals(1, orphans.size());
+        assertEquals("ghost", orphans.get(0).getRowToken());
+        // llmRows 含 null 元素：跳过不抛异常，其余行正常分配
+        List<SimilarAsinResultRowDto> withNull = new ArrayList<>();
+        withNull.add(null);
+        withNull.add(row("dup", "1", "B0A0000001", "英国"));
+        List<SimilarAsinResultRowDto> orphans2 = new ArrayList<>();
+        Map<String, String> index2 = service.indexRowsByChunkKey(rowsByChunk);
+        Map<String, Map<String, SimilarAsinResultRowDto>> merged2 = service.assignLlmRowsToChunks(
+                rowsByChunk, withNull, index2, null, null, orphans2);
+        assertEquals(1, merged2.size());
+        assertEquals(List.of("dup"), assignedRowKeys(merged2));
+        assertTrue(orphans2.isEmpty());
+    }
+
+    @Test
+    void test_task_010_chunk_row_key_dependency_failure_releases_resources() throws Exception {
+        // chunk payload 读取失败：抛可识别业务异常且不产生部分 merge；
+        // 依赖恢复后重试成功，无残留状态
+        List<TaskChunkEntity> chunks = List.of(chunk(1L, "hashA", 1, "ptr:chunk-A"));
+        when(taskChunkMapper.selectList(any())).thenReturn(chunks);
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenThrow(new IllegalStateException("rustfs down"));
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(7004L);
+        Method merge = SimilarAsinTaskService.class.getDeclaredMethod("mergeLlmRowsIntoChunk",
+                FileTaskEntity.class, String.class, Integer.class, List.class, Map.class);
+        merge.setAccessible(true);
+        BusinessException ex = assertThrows(BusinessException.class, () -> {
+            try {
+                merge.invoke(service, task, null, null, List.of(row("r1", "1", "B0A0000001", "英国")), Map.of());
+            } catch (java.lang.reflect.InvocationTargetException e) {
+                throw e.getCause();
+            }
+        });
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("chunk"),
+                "chunk 读取失败消息必须可识别，实际: " + ex.getMessage());
+        verify(transientPayloadStorageService, times(0)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+        // 恢复后重试成功：行合并到正确 chunk
+        when(transientPayloadStorageService.resolvePayload(eq("ptr:chunk-A"), anyString()))
+                .thenReturn(rowsJson(List.of(row("r1", "1", "B0A0000001", "英国"))));
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString()))
+                .thenReturn("stored:retry");
+        when(taskChunkMapper.selectOne(any())).thenReturn(chunks.get(0));
+        when(taskChunkMapper.update(any(), any())).thenReturn(1);
+        merge.invoke(service, task, null, null, List.of(row("r1", "1", "B0A0000001", "英国")), Map.of());
+        verify(transientPayloadStorageService, times(1)).storeChunkPayloadVersioned(anyString(), any(), anyString(), any(), anyString());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceSubmitTest.java

@@ -0,0 +1,362 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.service.DistributedJobLockService;
+import com.nanri.aiimage.config.InstanceMetadata;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.config.StorageProperties;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParsedPayloadDto;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinSourceFileDto;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinSubmitResultRequest;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileResultEntity;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskChunkEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity;
+import com.nanri.aiimage.modules.task.service.TaskDistributedLockService;
+import com.nanri.aiimage.modules.task.service.TaskFileJobService;
+import com.nanri.aiimage.modules.task.service.TaskProgressSnapshotService;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.TransactionDefinition;
+import org.springframework.transaction.TransactionStatus;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyLong;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceSubmitTest {
+
+    private static final Long TASK_ID = 21879L;
+    private static final String PARSED_POINTER = "rustfs:task-parsed/similar-asin/21879/payload.json";
+    private static final String CHUNK_POINTER = "rustfs:task-chunk/similar-asin/21879/chunk.json";
+    private static final String STORED_CHUNK_POINTER = "\"" + CHUNK_POINTER + "\"";
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private OssStorageService ossStorageService;
+    @Mock private StorageProperties storageProperties;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TaskFileJobService taskFileJobService;
+    @Mock private TaskDistributedLockService taskDistributedLockService;
+    @Mock private TaskProgressSnapshotService taskProgressSnapshotService;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private PlatformTransactionManager transactionManager;
+    @Mock private DistributedJobLockService distributedJobLockService;
+    @Mock private InstanceMetadata instanceMetadata;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+    @Mock private SimilarAsinImagePrefetchService imagePrefetchService;
+    @Mock private TransactionStatus transactionStatus;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    private final AtomicBoolean transactionActive = new AtomicBoolean();
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+        TableInfoHelper.initTableInfo(assistant, FileResultEntity.class);
+        TableInfoHelper.initTableInfo(assistant, TaskChunkEntity.class);
+        TableInfoHelper.initTableInfo(assistant, TaskScopeStateEntity.class);
+    }
+
+    @BeforeEach
+    void setUpTransactionAndLock() {
+        lenient().when(instanceMetadata.getInstanceId()).thenReturn("instance-a");
+        lenient().when(taskDistributedLockService.acquire(
+                        eq(SimilarAsinTaskService.MODULE_TYPE),
+                        anyLong(),
+                        any(Duration.class),
+                        eq(10_000L)))
+                .thenReturn(mock(TaskDistributedLockService.LockHandle.class));
+        lenient().when(transactionManager.getTransaction(any(TransactionDefinition.class)))
+                .thenAnswer(invocation -> {
+                    transactionActive.set(true);
+                    return transactionStatus;
+                });
+        lenient().doAnswer(invocation -> {
+            transactionActive.set(false);
+            return null;
+        }).when(transactionManager).commit(transactionStatus);
+        lenient().doAnswer(invocation -> {
+            transactionActive.set(false);
+            return null;
+        }).when(transactionManager).rollback(transactionStatus);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdownExecutors() {
+        service.shutdownAssembleExecutor();
+    }
+
+    @Test
+    void doneCallbackReadsPayloadOnlyBeforeShortTransaction() throws Exception {
+        FileTaskEntity task = runningTask("instance-a");
+        when(fileTaskMapper.selectById(TASK_ID)).thenReturn(task);
+        configureNewChunkAndScope();
+        when(taskChunkMapper.selectCount(any())).thenReturn(1L);
+
+        List<Boolean> storageCallTransactionStates = new ArrayList<>();
+        when(transientPayloadStorageService.resolvePayload(eq(PARSED_POINTER), anyString()))
+                .thenAnswer(invocation -> {
+                    storageCallTransactionStates.add(transactionActive.get());
+                    return parsedPayloadJson(List.of(new SimilarAsinParsedRowVo(), new SimilarAsinParsedRowVo()));
+                });
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(
+                eq(SimilarAsinTaskService.MODULE_TYPE), eq(TASK_ID), anyString(), eq(0), anyString()))
+                .thenAnswer(invocation -> {
+                    storageCallTransactionStates.add(transactionActive.get());
+                    return STORED_CHUNK_POINTER;
+                });
+        when(transientPayloadStorageService.wasLastStoreLocalFallback()).thenReturn(false);
+        doAnswer(invocation -> {
+            assertTrue(transactionActive.get());
+            FileResultEntity result = invocation.getArgument(0);
+            result.setId(501L);
+            return 1;
+        }).when(fileResultMapper).insert(any(FileResultEntity.class));
+        doAnswer(invocation -> {
+            storageCallTransactionStates.add(transactionActive.get());
+            return null;
+        }).when(taskCacheService).deleteTaskCache(TASK_ID);
+
+        service.submitResult(TASK_ID, request(true));
+
+        assertFalse(storageCallTransactionStates.isEmpty());
+        assertTrue(storageCallTransactionStates.stream().noneMatch(Boolean::booleanValue));
+        verify(transientPayloadStorageService).resolvePayload(eq(PARSED_POINTER), anyString());
+        ArgumentCaptor<FileResultEntity> resultCaptor = ArgumentCaptor.forClass(FileResultEntity.class);
+        verify(fileResultMapper).insert(resultCaptor.capture());
+        assertEquals(2, resultCaptor.getValue().getRowCount());
+        assertEquals("germany.xlsx", resultCaptor.getValue().getSourceFilename());
+    }
+
+    @Test
+    void unknownCommitOutcomeDoesNotDeletePossiblyCommittedChunk() throws Exception {
+        FileTaskEntity task = runningTask("instance-a");
+        when(fileTaskMapper.selectById(TASK_ID)).thenReturn(task);
+        configureNewChunkAndScope();
+        when(taskChunkMapper.selectCount(any())).thenReturn(0L);
+        configureChunkStore(false);
+        doAnswer(invocation -> {
+            transactionActive.set(false);
+            throw new IllegalStateException("commit ACK lost");
+        }).when(transactionManager).commit(transactionStatus);
+
+        IllegalStateException thrown = assertThrows(IllegalStateException.class,
+                () -> service.submitResult(TASK_ID, request(false)));
+
+        assertEquals("commit ACK lost", thrown.getMessage());
+        verify(transientPayloadStorageService, never()).extractPointer(anyString());
+        verify(transientPayloadStorageService, never()).deletePayloadIfPresent(anyString());
+        verify(taskCacheService, never()).touchTaskHeartbeat(TASK_ID);
+    }
+
+    @Test
+    void duplicateAlreadyPersistedChunkDoesNotRunPayloadCleanup() throws Exception {
+        FileTaskEntity task = runningTask("instance-a");
+        task.setResultJson("{\"ownerInstanceId\":\"instance-a\"}");
+        when(fileTaskMapper.selectById(TASK_ID)).thenReturn(task);
+        when(taskChunkMapper.selectOne(any())).thenReturn(chunk("\"rustfs:winner\""));
+        configureScopeStorage(null);
+        when(taskChunkMapper.selectCount(any())).thenReturn(1L);
+
+        service.submitResult(TASK_ID, request(false));
+
+        verify(transientPayloadStorageService, never()).extractPointer(anyString());
+        verify(transientPayloadStorageService, never()).deletePayloadIfPresent(anyString());
+    }
+
+    @Test
+    void localFallbackOwnerFailureRollsBackChunkAndKeepsCandidate() throws Exception {
+        FileTaskEntity task = runningTask(null);
+        when(fileTaskMapper.selectById(TASK_ID)).thenReturn(task);
+        configureNewChunkAndScope();
+        when(taskChunkMapper.selectCount(any())).thenReturn(1L);
+        configureChunkStore(true);
+        when(fileTaskMapper.updateById(any(FileTaskEntity.class))).thenReturn(0);
+
+        IllegalStateException thrown = assertThrows(IllegalStateException.class,
+                () -> service.submitResult(TASK_ID, request(false)));
+
+        assertTrue(thrown.getMessage().contains("Failed to bind local fallback task owner"));
+        verify(taskChunkMapper).insert(any(TaskChunkEntity.class));
+        verify(transactionManager).rollback(transactionStatus);
+        verify(transactionManager, never()).commit(transactionStatus);
+        verify(transientPayloadStorageService, never()).deletePayloadIfPresent(anyString());
+    }
+
+    @Test
+    void duplicateLocalCandidateIsNotBoundAndReferencedPayloadIsKept() throws Exception {
+        FileTaskEntity task = runningTask(null);
+        when(fileTaskMapper.selectById(TASK_ID)).thenReturn(task);
+        TaskChunkEntity winner = chunk(STORED_CHUNK_POINTER);
+        when(taskChunkMapper.selectOne(any())).thenReturn(null, winner);
+        configureScopeStorage(null);
+        configureChunkStore(true);
+        when(transientPayloadStorageService.extractPointer(STORED_CHUNK_POINTER)).thenReturn(CHUNK_POINTER);
+        when(taskChunkMapper.selectCount(any())).thenReturn(1L);
+
+        service.submitResult(TASK_ID, request(false));
+
+        verify(taskChunkMapper, never()).insert(any(TaskChunkEntity.class));
+        verify(fileTaskMapper, never()).updateById(any(FileTaskEntity.class));
+        verify(transientPayloadStorageService, never()).deletePayloadIfPresent(STORED_CHUNK_POINTER);
+    }
+
+    @Test
+    void repeatedNonFinalCallbackCannotClearCompletedScope() throws Exception {
+        FileTaskEntity task = runningTask("instance-a");
+        task.setResultJson("{\"ownerInstanceId\":\"instance-a\"}");
+        when(fileTaskMapper.selectById(TASK_ID)).thenReturn(task);
+        TaskChunkEntity existing = chunk("\"rustfs:winner\"");
+        when(taskChunkMapper.selectOne(any())).thenReturn(existing);
+        TaskScopeStateEntity scope = scope(1);
+        when(taskScopeStateMapper.selectOne(any())).thenReturn(scope);
+        when(taskChunkMapper.selectCount(any())).thenReturn(1L);
+
+        service.submitResult(TASK_ID, request(false));
+
+        assertEquals(1, scope.getCompleted());
+        verify(taskScopeStateMapper).updateById(scope);
+        verify(transientPayloadStorageService, never()).storeChunkPayloadVersioned(
+                anyString(), anyLong(), anyString(), any(), anyString());
+    }
+
+    private String parsedPayloadJson(List<SimilarAsinParsedRowVo> rows) throws Exception {
+        SimilarAsinParsedPayloadDto payload = new SimilarAsinParsedPayloadDto();
+        payload.setAllItems(rows);
+        payload.setItems(rows);
+        SimilarAsinSourceFileDto sourceFile = new SimilarAsinSourceFileDto();
+        sourceFile.setFileKey("uploads/germany.xlsx");
+        sourceFile.setOriginalFilename("germany.xlsx");
+        payload.setSourceFiles(List.of(sourceFile));
+        return objectMapper.writeValueAsString(payload);
+    }
+
+    private void configureNewChunkAndScope() {
+        AtomicReference<TaskChunkEntity> chunkRef = new AtomicReference<>();
+        when(taskChunkMapper.selectOne(any())).thenAnswer(invocation -> chunkRef.get());
+        doAnswer(invocation -> {
+            TaskChunkEntity chunk = invocation.getArgument(0);
+            chunk.setId(301L);
+            chunkRef.set(chunk);
+            return 1;
+        }).when(taskChunkMapper).insert(any(TaskChunkEntity.class));
+        configureScopeStorage(null);
+    }
+
+    private void configureScopeStorage(TaskScopeStateEntity initial) {
+        AtomicReference<TaskScopeStateEntity> scopeRef = new AtomicReference<>(initial);
+        when(taskScopeStateMapper.selectOne(any())).thenAnswer(invocation -> scopeRef.get());
+        doAnswer(invocation -> {
+            TaskScopeStateEntity scope = invocation.getArgument(0);
+            scope.setId(401L);
+            scopeRef.set(scope);
+            return 1;
+        }).when(taskScopeStateMapper).insert(any(TaskScopeStateEntity.class));
+    }
+
+    private void configureChunkStore(boolean localFallback) {
+        when(transientPayloadStorageService.storeChunkPayloadVersioned(
+                eq(SimilarAsinTaskService.MODULE_TYPE), eq(TASK_ID), anyString(), eq(0), anyString()))
+                .thenReturn(STORED_CHUNK_POINTER);
+        when(transientPayloadStorageService.wasLastStoreLocalFallback()).thenReturn(localFallback);
+    }
+
+    private FileTaskEntity runningTask(String owner) throws Exception {
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(TASK_ID);
+        task.setModuleType(SimilarAsinTaskService.MODULE_TYPE);
+        task.setStatus("RUNNING");
+        task.setUserId(7L);
+        String resultJson = "{\"parsedPayloadRef\":\"" + PARSED_POINTER + "\"";
+        if (owner != null) {
+            resultJson += ",\"ownerInstanceId\":\"" + owner + "\"";
+        }
+        task.setResultJson(resultJson + "}");
+        return task;
+    }
+
+    private SimilarAsinSubmitResultRequest request(boolean done) {
+        SimilarAsinSubmitResultRequest request = new SimilarAsinSubmitResultRequest();
+        request.setSubmissionId("similar-asin-21879");
+        request.setChunkIndex(0);
+        request.setChunkTotal(1);
+        request.setDone(done);
+        return request;
+    }
+
+    private TaskChunkEntity chunk(String payload) {
+        TaskChunkEntity chunk = new TaskChunkEntity();
+        chunk.setId(301L);
+        chunk.setTaskId(TASK_ID);
+        chunk.setModuleType(SimilarAsinTaskService.MODULE_TYPE);
+        chunk.setScopeHash("existing-scope");
+        chunk.setChunkIndex(0);
+        chunk.setChunkTotal(1);
+        chunk.setPayloadJson(payload);
+        return chunk;
+    }
+
+    private TaskScopeStateEntity scope(int completed) {
+        TaskScopeStateEntity scope = new TaskScopeStateEntity();
+        scope.setId(401L);
+        scope.setTaskId(TASK_ID);
+        scope.setModuleType(SimilarAsinTaskService.MODULE_TYPE);
+        scope.setScopeKey("similar-asin-21879");
+        scope.setScopeHash("existing-scope");
+        scope.setChunkTotal(1);
+        scope.setCompleted(completed);
+        scope.setStateJson("{\"phase\":\"RECEIVED\",\"llm\":\"PENDING\"}");
+        return scope;
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceTest.java

@@ -0,0 +1,121 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinResultRowDto;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import org.junit.jupiter.api.Test;
+
+import java.lang.reflect.Field;
+import java.util.LinkedHashMap;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class SimilarAsinTaskServiceTest {
+
+    @Test
+    @SuppressWarnings("unchecked")
+    void resultWorkbookRestoresPriceAfterCountryAndShiftsImageColumns() throws Exception {
+        Field headersField = SimilarAsinTaskService.class.getDeclaredField("RESULT_HEADERS");
+        headersField.setAccessible(true);
+        List<String> headers = (List<String>) headersField.get(null);
+
+        assertEquals(List.of(
+                "id", "asin", "国家", "价格", "卖家名称", "品牌", "是否有货", "相似度",
+                "是否符合类目", "不符合理由", "产品类目", "状态", "主图", "阿里巴巴图片1", "阿里巴巴图片2"
+        ), headers);
+        assertEquals(12, staticIntField("IMG_COL_MAIN"));
+        assertEquals(13, staticIntField("IMG_COL_PUZZLE1"));
+        assertEquals(14, staticIntField("IMG_COL_PUZZLE2"));
+    }
+
+    @Test
+    void resultStatusUsesReturnedCozeDataAndImages() {
+        assertEquals("\u5931\u8d25", SimilarAsinTaskService.resolveResultStatus(null));
+
+        SimilarAsinResultRowDto empty = new SimilarAsinResultRowDto();
+        assertEquals("\u5931\u8d25", SimilarAsinTaskService.resolveResultStatus(empty));
+
+        SimilarAsinResultRowDto withImage = new SimilarAsinResultRowDto();
+        withImage.setStatus("FAILED");
+        withImage.setMainUrl("https://example.com/main.jpg");
+        assertEquals("\u6210\u529f", SimilarAsinTaskService.resolveResultStatus(withImage));
+
+        SimilarAsinResultRowDto withCozeStatus = new SimilarAsinResultRowDto();
+        withCozeStatus.setStatus("success");
+        assertEquals("\u6210\u529f", SimilarAsinTaskService.resolveResultStatus(withCozeStatus));
+
+        SimilarAsinResultRowDto failedStatus = new SimilarAsinResultRowDto();
+        failedStatus.setStatus("FAILED");
+        assertEquals("\u5931\u8d25", SimilarAsinTaskService.resolveResultStatus(failedStatus));
+
+        SimilarAsinResultRowDto withVisibleResultData = new SimilarAsinResultRowDto();
+        assertEquals("\u6210\u529f", SimilarAsinTaskService.resolveResultStatus(withVisibleResultData, "", "80%", "", "", ""));
+    }
+
+    @Test
+    void fileBuildProgressIsTerminalOnlyAfterTaskAndStageComplete() {
+        assertTrue(SimilarAsinTaskService.isTerminalFileBuildProgress("SUCCESS", 3, 3));
+        assertTrue(SimilarAsinTaskService.isTerminalFileBuildProgress("FAILED", 3, 3));
+        assertFalse(SimilarAsinTaskService.isTerminalFileBuildProgress("RUNNING", 3, 3));
+        assertFalse(SimilarAsinTaskService.isTerminalFileBuildProgress("SUCCESS", 2, 3));
+    }
+
+    @Test
+    void failedResultRowsWithBlankIsConformEnableCategoryRetry() {
+        SimilarAsinParsedRowVo blankCategory = new SimilarAsinParsedRowVo();
+        blankCategory.setValues(new LinkedHashMap<>());
+        blankCategory.getValues().put("status", "FAILED");
+        blankCategory.getValues().put("is_conform", "");
+
+        assertTrue(SimilarAsinTaskService.shouldEnableCategorySwitchForRetry(
+                List.of("id", "asin", "country", "is_conform", "status"),
+                List.of(blankCategory),
+                true));
+
+        assertFalse(SimilarAsinTaskService.shouldEnableCategorySwitchForRetry(
+                List.of("id", "asin", "country", "is_conform", "status"),
+                List.of(blankCategory),
+                false));
+
+        blankCategory.getValues().put("is_conform", "符合");
+        assertFalse(SimilarAsinTaskService.shouldEnableCategorySwitchForRetry(
+                List.of("id", "asin", "country", "is_conform", "status"),
+                List.of(blankCategory),
+                true));
+    }
+
+    @Test
+    void firstPassImageResultWorkbookKeepsAllRowsForSecondParse() {
+        SimilarAsinParsedRowVo row = new SimilarAsinParsedRowVo();
+        row.setValues(new LinkedHashMap<>());
+        row.getValues().put("状态", "成功");
+        row.getValues().put("是否有货", "");
+        row.getValues().put("相似度", "");
+        row.getValues().put("是否符合类目", "");
+        row.getValues().put("不符合理由", "");
+        row.getValues().put("产品类目", "");
+
+        assertTrue(SimilarAsinTaskService.isFirstPassResultWorkbook(
+                List.of("id", "asin", "国家", "是否有货", "相似度", "是否符合类目", "不符合理由", "产品类目", "状态", "主图", "阿里巴巴图片1", "阿里巴巴图片2"),
+                List.of(row)));
+
+        row.getValues().put("是否符合类目", "符合");
+        assertFalse(SimilarAsinTaskService.isFirstPassResultWorkbook(
+                List.of("id", "asin", "国家", "是否有货", "相似度", "是否符合类目", "不符合理由", "产品类目", "状态", "主图", "阿里巴巴图片1", "阿里巴巴图片2"),
+                List.of(row)));
+
+        row.getValues().put("是否符合类目", "");
+        row.getValues().put("状态", "失败");
+        assertFalse(SimilarAsinTaskService.isFirstPassResultWorkbook(
+                List.of("id", "asin", "国家", "是否有货", "相似度", "是否符合类目", "不符合理由", "产品类目", "状态", "主图", "阿里巴巴图片1", "阿里巴巴图片2"),
+                List.of(row)));
+    }
+
+    private int staticIntField(String name) throws Exception {
+        Field field = SimilarAsinTaskService.class.getDeclaredField(name);
+        field.setAccessible(true);
+        return field.getInt(null);
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskServiceWorkbookControlTest.java

@@ -0,0 +1,269 @@
+package com.nanri.aiimage.modules.similarasin.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.exception.BusinessException;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.similarasin.mapper.SimilarAsinFilterConditionMapper;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinParseRequest;
+import com.nanri.aiimage.modules.similarasin.model.dto.SimilarAsinSourceFileDto;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParseVo;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import com.nanri.aiimage.modules.file.service.LocalFileStorageService;
+import com.nanri.aiimage.modules.task.mapper.FileResultMapper;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.InjectMocks;
+import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
+import org.apache.ibatis.builder.MapperBuilderAssistant;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.when;
+
+/**
+ * Task 8：WorkbookFactory 输入解析改为受控读取。
+ * 解析前先探测 zip 条目数与解压体积，超过配置上限直接拒绝并给出可识别失败提示，
+ * 避免超大/恶意 Excel 直接进入 WorkbookFactory 全量加载导致内存无界增长。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinTaskServiceWorkbookControlTest {
+
+    private static final AtomicLong NEXT_ID = new AtomicLong(50000);
+
+    @Mock private LocalFileStorageService localFileStorageService;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private FileResultMapper fileResultMapper;
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private SimilarAsinFilterConditionMapper filterConditionMapper;
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+    @Mock private SimilarAsinTaskCacheService taskCacheService;
+    @Mock private SimilarAsinProperties properties;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    @Mock private SimilarAsinImageEmbedder imageEmbedder;
+
+    @InjectMocks private SimilarAsinTaskService service;
+
+    @BeforeAll
+    static void initializeMybatisMetadata() {
+        MapperBuilderAssistant assistant = new MapperBuilderAssistant(new MybatisConfiguration(), "");
+        TableInfoHelper.initTableInfo(assistant, FileTaskEntity.class);
+    }
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.isBoundedResultAssemblyEnabled()).thenReturn(true);
+        lenient().when(properties.getImageCacheMaxBytes()).thenReturn(256L * 1024L * 1024L);
+        lenient().when(properties.getResultFileTimeoutMinutes()).thenReturn(90);
+        lenient().when(properties.getParseResponsePreviewLimit()).thenReturn(100);
+        lenient().when(properties.getMaxSourceFileBytes()).thenReturn(50L * 1024L * 1024L);
+        lenient().when(properties.getMaxParseRows()).thenReturn(50000);
+        lenient().when(properties.getMaxFieldLength()).thenReturn(2000);
+        lenient().when(properties.getMaxWorkbookZipEntries()).thenReturn(20000);
+        lenient().when(properties.getMaxWorkbookUncompressedBytes()).thenReturn(512L * 1024L * 1024L);
+        lenient().when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenReturn("rustfs:task-parsed/similar-asin/50000/payload.json");
+        lenient().doAnswer(invocation -> {
+            FileTaskEntity task = invocation.getArgument(0);
+            task.setId(NEXT_ID.incrementAndGet());
+            return 1;
+        }).when(fileTaskMapper).insert(any(FileTaskEntity.class));
+        lenient().when(fileResultMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.FileResultEntity.class))).thenReturn(1);
+        lenient().when(taskScopeStateMapper.insert(any(com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity.class))).thenReturn(1);
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(fileResultMapper.selectList(any())).thenReturn(List.of());
+    }
+
+    @AfterEach
+    void shutdown() {
+        service.shutdownAssembleExecutor();
+    }
+
+    private File buildWorkbook(int rowCount) throws Exception {
+        File file = Files.createTempFile("similar-asin-workbook-ctrl-", ".xlsx").toFile();
+        try (XSSFWorkbook workbook = new XSSFWorkbook(); FileOutputStream fos = new FileOutputStream(file)) {
+            var sheet = workbook.createSheet("Sheet1");
+            Row header = sheet.createRow(0);
+            header.createCell(0).setCellValue("id");
+            header.createCell(1).setCellValue("asin");
+            header.createCell(2).setCellValue("国家");
+            for (int i = 1; i <= rowCount; i++) {
+                Row row = sheet.createRow(i);
+                row.createCell(0).setCellValue(String.valueOf(i));
+                row.createCell(1).setCellValue(String.format("B0WBK%05d", i));
+                row.createCell(2).setCellValue("英国");
+            }
+            workbook.write(fos);
+        }
+        return file;
+    }
+
+    private SimilarAsinParseRequest request(String fileKey) {
+        SimilarAsinParseRequest request = new SimilarAsinParseRequest();
+        request.setUserId(7L);
+        SimilarAsinSourceFileDto sourceFile = new SimilarAsinSourceFileDto();
+        sourceFile.setFileKey(fileKey);
+        sourceFile.setOriginalFilename("workbook.xlsx");
+        request.setFiles(List.of(sourceFile));
+        request.setApiKey("sk-123");
+        request.setImgSwitch(Boolean.FALSE);
+        request.setCategorySwitch(Boolean.FALSE);
+        return request;
+    }
+
+    private SimilarAsinParseVo parse(File workbook, String fileKey) {
+        when(localFileStorageService.findLocalSourceFile(fileKey)).thenReturn(workbook);
+        return service.parseAndCreateTask(request(fileKey));
+    }
+
+    @Test
+    void test_task_008_workbook_excel_normal_default_path() throws Exception {
+        // 正常 xlsx：受控读取通过探测，解析成功且行数不丢失
+        File workbook = buildWorkbook(100);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/wb-default.xlsx");
+        assertEquals(100, vo.getAcceptedRows());
+        assertEquals(100, vo.getTotalRows());
+        assertEquals(100, vo.getItems().size());
+        assertEquals("B0WBK00001", vo.getItems().get(0).getAsin());
+    }
+
+    @Test
+    void test_task_008_workbook_excel_normal_multiple_items() throws Exception {
+        // 多文件批量：每个文件都走受控读取，汇总不丢行
+        File workbookA = buildWorkbook(25);
+        File workbookB = buildWorkbook(35);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/wb-a.xlsx")).thenReturn(workbookA);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/wb-b.xlsx")).thenReturn(workbookB);
+        SimilarAsinParseRequest request = request("uploads/20260829/wb-a.xlsx");
+        SimilarAsinSourceFileDto sourceB = new SimilarAsinSourceFileDto();
+        sourceB.setFileKey("uploads/20260829/wb-b.xlsx");
+        sourceB.setOriginalFilename("workbook-b.xlsx");
+        request.setFiles(List.of(request.getFiles().get(0), sourceB));
+        SimilarAsinParseVo vo = service.parseAndCreateTask(request);
+        assertEquals(60, vo.getAcceptedRows());
+        assertEquals(60, vo.getTotalRows());
+        assertNotNull(vo.getTaskId());
+    }
+
+    @Test
+    void test_task_008_workbook_excel_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复解析同一文件：结果一致，不产生重复状态
+        File workbook = buildWorkbook(50);
+        SimilarAsinParseVo first = parse(workbook, "uploads/20260829/wb-idem.xlsx");
+        SimilarAsinParseVo second = parse(workbook, "uploads/20260829/wb-idem.xlsx");
+        assertEquals(first.getAcceptedRows(), second.getAcceptedRows());
+        assertEquals(first.getItems().size(), second.getItems().size());
+        for (int i = 0; i < first.getItems().size(); i++) {
+            assertEquals(first.getItems().get(i).getAsin(), second.getItems().get(i).getAsin());
+        }
+    }
+
+    @Test
+    void test_task_008_workbook_excel_boundary_empty_input() throws Exception {
+        // 空文件（只有表头无数据行）：抛业务异常，不创建任务
+        File workbook = buildWorkbook(0);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/wb-empty.xlsx")).thenReturn(workbook);
+        BusinessException ex = assertThrows(BusinessException.class,
+                () -> parse(workbook, "uploads/20260829/wb-empty.xlsx"));
+        assertTrue(ex.getMessage() != null && !ex.getMessage().isBlank());
+        // 文件不存在：抛业务异常
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/wb-missing.xlsx")).thenReturn(null);
+        assertThrows(BusinessException.class, () -> parse(null, "uploads/20260829/wb-missing.xlsx"));
+    }
+
+    @Test
+    void test_task_008_workbook_excel_boundary_single_item() throws Exception {
+        // 单行文件：不依赖批量路径，结果正确
+        File workbook = buildWorkbook(1);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/wb-single.xlsx");
+        assertEquals(1, vo.getAcceptedRows());
+        assertEquals(1, vo.getItems().size());
+        assertEquals("B0WBK00001", vo.getItems().get(0).getAsin());
+        assertEquals(1, vo.getGroupCount());
+    }
+
+    @Test
+    void test_task_008_workbook_excel_boundary_limit_and_overflow() throws Exception {
+        // 解压体积超限：受控探测阶段拒绝，失败提示可识别，不发生无界内存增长
+        when(properties.getMaxWorkbookUncompressedBytes()).thenReturn(1024L);
+        File workbook = buildWorkbook(5);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/wb-huge.xlsx")).thenReturn(workbook);
+        BusinessException ex = assertThrows(BusinessException.class,
+                () -> parse(workbook, "uploads/20260829/wb-huge.xlsx"));
+        assertTrue(ex.getMessage() != null && (ex.getMessage().contains("解压") || ex.getMessage().contains("大小")),
+                "超大 Excel 失败提示必须可识别，实际: " + ex.getMessage());
+        // 条目数超限：同样在探测阶段拒绝
+        when(properties.getMaxWorkbookUncompressedBytes()).thenReturn(512L * 1024L * 1024L);
+        when(properties.getMaxWorkbookZipEntries()).thenReturn(2);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/wb-entries.xlsx")).thenReturn(workbook);
+        BusinessException ex2 = assertThrows(BusinessException.class,
+                () -> parse(workbook, "uploads/20260829/wb-entries.xlsx"));
+        assertTrue(ex2.getMessage() != null && ex2.getMessage().contains("条目"),
+                "超条目数失败提示必须可识别，实际: " + ex2.getMessage());
+        // 恢复默认配置：同一文件解析成功（探测不残留状态）
+        when(properties.getMaxWorkbookZipEntries()).thenReturn(20000);
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/wb-recovered.xlsx");
+        assertEquals(5, vo.getAcceptedRows());
+    }
+
+    @Test
+    void test_task_008_workbook_excel_invalid_input_rejected() throws Exception {
+        // 非 xlsx 内容（文本文件）：WorkbookFactory 打开失败，抛项目约定异常
+        File fake = Files.createTempFile("similar-asin-not-excel-", ".xlsx").toFile();
+        Files.write(fake.toPath(), "this is not an excel file".getBytes(StandardCharsets.UTF_8));
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/wb-fake.xlsx")).thenReturn(fake);
+        BusinessException ex = assertThrows(BusinessException.class,
+                () -> parse(fake, "uploads/20260829/wb-fake.xlsx"));
+        assertTrue(ex.getMessage() != null && ex.getMessage().contains("解析 Excel 失败"),
+                "损坏文件失败提示必须可识别，实际: " + ex.getMessage());
+    }
+
+    @Test
+    void test_task_008_workbook_excel_dependency_failure_releases_resources() throws Exception {
+        // RustFS 存储失败：解析抛异常；恢复后重试成功，受控读取无残留
+        File workbook = buildWorkbook(30);
+        when(localFileStorageService.findLocalSourceFile("uploads/20260829/wb-fail.xlsx")).thenReturn(workbook);
+        when(transientPayloadStorageService.storeParsedPayloadFast(
+                        eq(SimilarAsinTaskService.MODULE_TYPE), any(), anyString(), anyString(), eq(false)))
+                .thenThrow(new IllegalStateException("rustfs down"))
+                .thenReturn("rustfs:task-parsed/similar-asin/50001/payload.json");
+        assertThrows(IllegalStateException.class, () -> parse(workbook, "uploads/20260829/wb-fail.xlsx"));
+        SimilarAsinParseVo vo = parse(workbook, "uploads/20260829/wb-recovered2.xlsx");
+        assertEquals(30, vo.getAcceptedRows());
+        // 默认配置值处于有效区间
+        SimilarAsinProperties defaults = new SimilarAsinProperties();
+        assertNotNull(defaults.getMaxWorkbookZipEntries());
+        assertNotNull(defaults.getMaxWorkbookUncompressedBytes());
+        assertTrue(defaults.getMaxWorkbookZipEntries() >= 1000, "默认条目上限至少 1000");
+        assertTrue(defaults.getMaxWorkbookUncompressedBytes() >= 100L * 1024L * 1024L, "默认解压上限至少 100MB");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/support/SimilarAsinExcelParserBoundaryTest.java

@@ -0,0 +1,205 @@
+package com.nanri.aiimage.modules.similarasin.service.support;
+
+import org.apache.poi.ss.usermodel.CellStyle;
+import org.apache.poi.ss.usermodel.CreationHelper;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.util.Date;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * 任务 84：行解析边界测试。
+ * 超长字段（按现状截断 2000）、畸形 ASIN 原样透传、BOM 剥离、混合编码（全角空格折叠）、
+ * 数值/日期/公式单元格转文本、大表（5000 行）性能上界。
+ */
+class SimilarAsinExcelParserBoundaryTest {
+
+    private final SimilarAsinExcelParser parser = new SimilarAsinExcelParser();
+
+    private static final String[] HEADERS = {"id", "asin", "国家", "sku", "价格", "url", "标题"};
+
+    private File toTempFile(XSSFWorkbook wb) throws Exception {
+        File file = File.createTempFile("similar-asin-boundary-", ".xlsx");
+        file.deleteOnExit();
+        try (FileOutputStream out = new FileOutputStream(file)) {
+            wb.write(out);
+        }
+        wb.close();
+        return file;
+    }
+
+    private XSSFWorkbook emptyWorkbook() {
+        XSSFWorkbook wb = new XSSFWorkbook();
+        Sheet sheet = wb.createSheet("Sheet1");
+        Row header = sheet.createRow(0);
+        for (int i = 0; i < HEADERS.length; i++) {
+            header.createCell(i).setCellValue(HEADERS[i]);
+        }
+        return wb;
+    }
+
+    @Test
+    void test_parse_long_field() throws Exception {
+        XSSFWorkbook wb = emptyWorkbook();
+        Sheet sheet = wb.getSheetAt(0);
+        Row row = sheet.createRow(1);
+        row.createCell(0).setCellValue("long-1");
+        row.createCell(1).setCellValue("B01LONG");
+        row.createCell(2).setCellValue("US");
+        String longTitle = "A".repeat(2500);
+        row.createCell(6).setCellValue(longTitle);
+        File file = toTempFile(wb);
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        String title = parsed.rows().get(0).title();
+        assertEquals(2000, title.length(), "超长字段按现状截断到 2000");
+        assertEquals("A".repeat(2000), title);
+        assertEquals("A".repeat(2500).substring(0, 2000), title);
+        assertEquals(2000, parsed.rows().get(0).values().get("标题").length(), "values 映射同样截断");
+    }
+
+    @Test
+    void test_parse_malformed_asin() throws Exception {
+        XSSFWorkbook wb = emptyWorkbook();
+        Sheet sheet = wb.getSheetAt(0);
+        Row row = sheet.createRow(1);
+        row.createCell(0).setCellValue("bad-1");
+        row.createCell(1).setCellValue("b01@# $%^&*()");
+        row.createCell(2).setCellValue("US");
+        File file = toTempFile(wb);
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        assertEquals("B01@# $%^&*()", parsed.rows().get(0).asin(), "畸形 ASIN 原样透传（仅大小写归一）");
+    }
+
+    @Test
+    void test_parse_bom() throws Exception {
+        XSSFWorkbook wb = new XSSFWorkbook();
+        Sheet sheet = wb.createSheet("Sheet1");
+        Row header = sheet.createRow(0);
+        header.createCell(0).setCellValue("id");
+        header.createCell(1).setCellValue("asin");
+        header.createCell(2).setCellValue("国家");
+        Row row = sheet.createRow(1);
+        row.createCell(0).setCellValue("bom-1");
+        row.createCell(1).setCellValue("B01BOM");
+        row.createCell(2).setCellValue("US");
+        File file = toTempFile(wb);
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        assertEquals("id", parsed.headers().get(0), "BOM 头从表头剥离");
+        assertEquals("B01BOM", parsed.rows().get(0).asin(), "BOM 头从单元格值剥离");
+    }
+
+    @Test
+    void test_parse_mixed_encoding() throws Exception {
+        XSSFWorkbook wb = emptyWorkbook();
+        Sheet sheet = wb.getSheetAt(0);
+        Row row = sheet.createRow(1);
+        row.createCell(0).setCellValue("mix-1");
+        row.createCell(1).setCellValue("B01MIX");
+        row.createCell(2).setCellValue("US");
+        row.createCell(6).setCellValue("中文 标题 ABC　DEF 　 GH");
+        File file = toTempFile(wb);
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        assertEquals("中文 标题 ABC DEF  GH".replace("  GH", " GH"), parsed.rows().get(0).title(),
+                "混合编码单元格保留内容");
+        String title = parsed.rows().get(0).title();
+        assertTrue(title.startsWith("中文 标题 ABC"), "中文+拉丁混排保留, actual=" + title);
+        assertEquals("中文 标题 ABC DEF GH", title, "全角空格转半角并折叠连续空白");
+    }
+
+    @Test
+    void test_parse_numeric_cell() throws Exception {
+        XSSFWorkbook wb = emptyWorkbook();
+        Sheet sheet = wb.getSheetAt(0);
+        Row row = sheet.createRow(1);
+        row.createCell(0).setCellValue(1234.5);
+        row.createCell(1).setCellValue("B01NUM");
+        row.createCell(2).setCellValue("US");
+        row.createCell(4).setCellValue(19.9);
+        File file = toTempFile(wb);
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        assertEquals("1234.5", parsed.rows().get(0).id(), "数值单元格转文本");
+        assertEquals("19.9", parsed.rows().get(0).price(), "价格列数值转文本");
+    }
+
+    @Test
+    void test_parse_date_cell() throws Exception {
+        XSSFWorkbook wb = emptyWorkbook();
+        Sheet sheet = wb.getSheetAt(0);
+        CreationHelper helper = wb.getCreationHelper();
+        CellStyle dateStyle = wb.createCellStyle();
+        dateStyle.setDataFormat(helper.createDataFormat().getFormat("yyyy-MM-dd"));
+        Row row = sheet.createRow(1);
+        row.createCell(0).setCellValue("date-1");
+        row.createCell(1).setCellValue("B01DATE");
+        row.createCell(2).setCellValue("US");
+        row.createCell(4).setCellValue(new Date(1767225600000L)); // 2026-01-02 UTC
+        row.getCell(4).setCellStyle(dateStyle);
+        File file = toTempFile(wb);
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        assertEquals("2026-01-01", parsed.rows().get(0).price(), "日期单元格按格式转文本（POI UTC 渲染）");
+    }
+
+    @Test
+    void test_parse_formula_cell() throws Exception {
+        XSSFWorkbook wb = emptyWorkbook();
+        Sheet sheet = wb.getSheetAt(0);
+        Row row = sheet.createRow(1);
+        row.createCell(0).setCellValue("formula-1");
+        row.createCell(1).setCellValue("B01FML");
+        row.createCell(2).setCellValue("US");
+        row.createCell(4).setCellFormula("19.9*2");
+        File file = toTempFile(wb);
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        // 现状语义：DataFormatter 对无缓存值的公式返回公式串原样（解析器不做求值）
+        assertEquals("19.9*2", parsed.rows().get(0).price(), "公式单元格取缓存值（无缓存值则保留公式串）");
+    }
+
+    @Test
+    void test_parse_large_sheet() throws Exception {
+        XSSFWorkbook wb = emptyWorkbook();
+        Sheet sheet = wb.getSheetAt(0);
+        for (int r = 1; r <= 5000; r++) {
+            Row row = sheet.createRow(r);
+            row.createCell(0).setCellValue("row-" + r);
+            row.createCell(1).setCellValue("B0" + String.format("%04d", r));
+            row.createCell(2).setCellValue(r % 2 == 0 ? "US" : "DE");
+            row.createCell(3).setCellValue("SKU-" + r);
+            row.createCell(4).setCellValue(10.0 + r);
+            row.createCell(5).setCellValue("http://img/" + r + ".jpg");
+            row.createCell(6).setCellValue("title " + r);
+        }
+        File file = toTempFile(wb);
+
+        long started = System.nanoTime();
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+        long elapsedMs = (System.nanoTime() - started) / 1_000_000;
+
+        assertEquals(5000, parsed.rows().size(), "5000 行全部解析");
+        assertEquals("row-5000", parsed.rows().get(4999).id());
+        assertEquals("B05000", parsed.rows().get(4999).asin(), "大写归一后原样透传");
+        assertNotNull(parsed.rows().get(4999).values());
+        assertTrue(elapsedMs < 10_000, "5000 行解析耗时上界 10s, actual=" + elapsedMs + "ms");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/support/SimilarAsinExcelParserTest.java

@@ -0,0 +1,199 @@
+package com.nanri.aiimage.modules.similarasin.service.support;
+
+import com.nanri.aiimage.common.exception.BusinessException;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.nio.file.Files;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * 任务 83：SimilarAsinExcelParser 行解析器。
+ * POI 读 Excel 行 → 中间行对象（原始单元格值）；列序映射、空行跳过、空输入/坏文件异常、流不被篡改。
+ */
+class SimilarAsinExcelParserTest {
+
+    private final SimilarAsinExcelParser parser = new SimilarAsinExcelParser();
+
+    private XSSFWorkbook workbook(String[] headers, String[][] rows) {
+        XSSFWorkbook wb = new XSSFWorkbook();
+        Sheet sheet = wb.createSheet("Sheet1");
+        Row header = sheet.createRow(0);
+        for (int i = 0; i < headers.length; i++) {
+            header.createCell(i).setCellValue(headers[i]);
+        }
+        for (int r = 0; r < rows.length; r++) {
+            Row row = sheet.createRow(r + 1);
+            for (int c = 0; c < rows[r].length; c++) {
+                row.createCell(c).setCellValue(rows[r][c]);
+            }
+        }
+        return wb;
+    }
+
+    private File toTempFile(XSSFWorkbook wb) throws Exception {
+        File file = File.createTempFile("similar-asin-parser-", ".xlsx");
+        file.deleteOnExit();
+        try (FileOutputStream out = new FileOutputStream(file)) {
+            wb.write(out);
+        }
+        wb.close();
+        return file;
+    }
+
+    private byte[] toBytes(XSSFWorkbook wb) throws Exception {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        wb.write(out);
+        wb.close();
+        return out.toByteArray();
+    }
+
+    private static final String[] HEADERS = {"id", "asin", "国家", "sku", "价格", "url", "标题"};
+
+    @Test
+    void test_parse_normal_rows() throws Exception {
+        File file = toTempFile(workbook(HEADERS, new String[][]{
+                {"row-1", "B01ABC", "US", "SKU-1", "19.9", "http://img/1.jpg", "title one"},
+                {"row-2", "B02DEF", "DE", "SKU-2", "29.9", "http://img/2.jpg", "title two"}
+        }));
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        assertEquals(2, parsed.rows().size());
+        SimilarAsinExcelParser.SimilarAsinExcelRow first = parsed.rows().get(0);
+        assertEquals("row-1", first.id());
+        assertEquals("B01ABC", first.asin());
+        assertEquals("US", first.country());
+        assertEquals("SKU-1", first.sku());
+        assertEquals("19.9", first.price());
+        assertEquals("http://img/1.jpg", first.url());
+        assertEquals("title one", first.title());
+        assertEquals(2, first.rowIndex());
+        SimilarAsinExcelParser.SimilarAsinExcelRow second = parsed.rows().get(1);
+        assertEquals("row-2", second.id());
+        assertEquals("DE", second.country());
+        assertEquals(3, second.rowIndex());
+    }
+
+    @Test
+    void test_parse_single_row() throws Exception {
+        File file = toTempFile(workbook(HEADERS, new String[][]{{"only-1", "B00SINGLE", "US", "", "", "", "single"}}));
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        assertEquals(1, parsed.rows().size());
+        SimilarAsinExcelParser.SimilarAsinExcelRow row = parsed.rows().get(0);
+        assertEquals("only-1", row.id());
+        assertEquals("B00SINGLE", row.asin());
+        assertEquals("US", row.country());
+        assertEquals(2, row.rowIndex());
+        assertNotNull(row.values());
+        assertEquals(HEADERS.length, row.values().size());
+    }
+
+    @Test
+    void test_parse_columns_mapping() throws Exception {
+        String[] scrambled = {"价格", "asin", "标题", "id", "url", "国家"};
+        File file = toTempFile(workbook(scrambled, new String[][]{{"100", "B01MAP", "mapped title", "row-1", "http://img/map.jpg", "US"}}));
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        SimilarAsinExcelParser.SimilarAsinExcelRow row = parsed.rows().get(0);
+        assertEquals("row-1", row.id());
+        assertEquals("B01MAP", row.asin());
+        assertEquals("US", row.country());
+        assertEquals("100", row.price());
+        assertEquals("http://img/map.jpg", row.url());
+        assertEquals("mapped title", row.title());
+        assertEquals("", row.sku());
+        assertEquals(scrambled.length, row.values().size());
+        assertEquals("row-1", row.values().get("id"));
+        assertEquals("B01MAP", row.values().get("asin"));
+    }
+
+    @Test
+    void test_parse_empty_sheet() throws Exception {
+        File file = toTempFile(workbook(HEADERS, new String[0][]));
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        assertTrue(parsed.rows().isEmpty());
+        assertEquals(HEADERS.length, parsed.headers().size());
+        assertEquals("id", parsed.headers().get(0));
+    }
+
+    @Test
+    void test_parse_empty_rows_skipped() throws Exception {
+        XSSFWorkbook wb = new XSSFWorkbook();
+        Sheet sheet = wb.createSheet("Sheet1");
+        Row header = sheet.createRow(0);
+        header.createCell(0).setCellValue("id");
+        header.createCell(1).setCellValue("asin");
+        header.createCell(2).setCellValue("国家");
+        Row data1 = sheet.createRow(1);
+        data1.createCell(0).setCellValue("keep-1");
+        data1.createCell(1).setCellValue("B01KEEP");
+        data1.createCell(2).setCellValue("US");
+        Row blank = sheet.createRow(2);
+        blank.createCell(0).setCellValue("");
+        blank.createCell(1).setCellValue("");
+        blank.createCell(2).setCellValue("");
+        // 第 4 行（索引 3）故意不创建 → getRow 返回 null
+        Row data2 = sheet.createRow(4);
+        data2.createCell(0).setCellValue("keep-2");
+        data2.createCell(1).setCellValue("B02KEEP");
+        data2.createCell(2).setCellValue("DE");
+        File file = toTempFile(wb);
+
+        SimilarAsinExcelParser.ParsedSheet parsed = parser.parse(file);
+
+        assertEquals(2, parsed.rows().size());
+        assertEquals(2, parsed.rows().get(0).rowIndex());
+        assertEquals("keep-1", parsed.rows().get(0).id());
+        assertEquals(5, parsed.rows().get(1).rowIndex());
+        assertEquals("keep-2", parsed.rows().get(1).id());
+    }
+
+    @Test
+    void test_parse_null_input_throws() {
+        assertThrows(IllegalArgumentException.class, () -> parser.parse((InputStream) null));
+        assertThrows(IllegalArgumentException.class, () -> parser.parse((File) null));
+    }
+
+    @Test
+    void test_parse_unsupported_format() throws Exception {
+        File garbage = File.createTempFile("similar-asin-bad-", ".xlsx");
+        garbage.deleteOnExit();
+        Files.write(garbage.toPath(), "this is definitely not an excel file".getBytes());
+
+        BusinessException ex = assertThrows(BusinessException.class, () -> parser.parse(garbage));
+
+        assertTrue(ex.getMessage().contains("解析 Excel 失败"), "非 Excel 文件应转业务异常, actual=" + ex.getMessage());
+    }
+
+    @Test
+    void test_parse_no_mutation() throws Exception {
+        byte[] content = toBytes(workbook(HEADERS, new String[][]{
+                {"row-1", "B01ABC", "US", "SKU-1", "19.9", "http://img/1.jpg", "title one"}
+        }));
+
+        SimilarAsinExcelParser.ParsedSheet first = parser.parse(new ByteArrayInputStream(content));
+        SimilarAsinExcelParser.ParsedSheet second = parser.parse(new ByteArrayInputStream(content));
+
+        assertEquals(first.headers(), second.headers());
+        assertEquals(first.rows(), second.rows());
+        assertEquals(1, first.rows().size());
+        assertEquals("B01ABC", first.rows().get(0).asin());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/support/SimilarAsinGroupingConverterTest.java

@@ -0,0 +1,161 @@
+package com.nanri.aiimage.modules.similarasin.service.support;
+
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedGroupVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * 任务 86：SimilarAsinGroupingConverter 分组转换器。
+ * 归一化行 → 分组 DTO；分组规则与现状 buildParsedGroups 一致：
+ * 同 baseId 相邻块归组、groupKey 兜底、startIndex/endIndex 半开区间游标、顺序保持。
+ */
+class SimilarAsinGroupingConverterTest {
+
+    private static SimilarAsinParsedRowVo row(String sourceFileKey, String displayId, String groupKey,
+                                              int rowIndex, String asin, String country) {
+        SimilarAsinParsedRowVo vo = new SimilarAsinParsedRowVo();
+        vo.setSourceFileKey(sourceFileKey);
+        vo.setSourceFilename("f.xlsx");
+        vo.setDisplayId(displayId);
+        vo.setGroupKey(groupKey);
+        vo.setRowIndex(rowIndex);
+        vo.setSourceId(displayId);
+        vo.setAsin(asin);
+        vo.setCountry(country);
+        vo.setValues(new LinkedHashMap<>());
+        return vo;
+    }
+
+    @Test
+    void test_group_normal() {
+        List<SimilarAsinParsedRowVo> rows = List.of(
+                row("k1", "1", "k1::1@2", 2, "B01A", "US"),
+                row("k1", "2", "k1::2@3", 3, "B01B", "DE"));
+
+        List<SimilarAsinParsedGroupVo> groups = SimilarAsinGroupingConverter.convert(rows);
+
+        assertEquals(2, groups.size());
+        assertEquals("1", groups.get(0).getBaseId());
+        assertEquals("k1::1@2", groups.get(0).getGroupKey());
+        assertEquals("1", groups.get(0).getDisplayId());
+        assertEquals(1, groups.get(0).getItemCount());
+        assertEquals(0, groups.get(0).getStartIndex());
+        assertEquals(1, groups.get(0).getEndIndex());
+        assertEquals("2", groups.get(1).getBaseId());
+        assertEquals(1, groups.get(1).getStartIndex());
+        assertEquals(2, groups.get(1).getEndIndex());
+    }
+
+    @Test
+    void test_group_sub_rows() {
+        List<SimilarAsinParsedRowVo> rows = List.of(
+                row("k1", "2_1", "k1::2@2", 2, "B01A", "US"),
+                row("k1", "2_2", "k1::2@2", 3, "B01B", "DE"),
+                row("k1", "2_3", "k1::2@2", 4, "B01C", "FR"));
+
+        List<SimilarAsinParsedGroupVo> groups = SimilarAsinGroupingConverter.convert(rows);
+
+        assertEquals(1, groups.size());
+        SimilarAsinParsedGroupVo group = groups.get(0);
+        assertEquals("2", group.getBaseId(), "子行 2_1/2_2/2_3 归同组");
+        assertEquals("k1::2@2", group.getGroupKey());
+        assertEquals("2_1", group.getDisplayId(), "组首条展示 ID 保留子行");
+        assertEquals(3, group.getItemCount());
+        assertEquals(0, group.getStartIndex());
+        assertEquals(3, group.getEndIndex());
+    }
+
+    @Test
+    void test_group_single_item() {
+        List<SimilarAsinParsedRowVo> rows = List.of(row("k1", "7", "k1::7@2", 2, "B01S", "US"));
+
+        List<SimilarAsinParsedGroupVo> groups = SimilarAsinGroupingConverter.convert(rows);
+
+        assertEquals(1, groups.size());
+        assertEquals(1, groups.get(0).getItemCount());
+        assertEquals(0, groups.get(0).getStartIndex());
+        assertEquals(1, groups.get(0).getEndIndex());
+    }
+
+    @Test
+    void test_group_empty_input() {
+        assertTrue(SimilarAsinGroupingConverter.convert(null).isEmpty());
+        assertTrue(SimilarAsinGroupingConverter.convert(List.of()).isEmpty());
+    }
+
+    @Test
+    void test_group_dto_fields() {
+        List<SimilarAsinParsedRowVo> rows = List.of(row("uploads/k.xlsx", "5", "uploads/k.xlsx::5@2", 2, "B01D", "JP"));
+
+        List<SimilarAsinParsedGroupVo> groups = SimilarAsinGroupingConverter.convert(rows);
+
+        SimilarAsinParsedGroupVo group = groups.get(0);
+        assertEquals("uploads/k.xlsx", group.getSourceFileKey());
+        assertEquals("f.xlsx", group.getSourceFilename());
+        assertEquals("uploads/k.xlsx::5@2", group.getGroupKey());
+        assertEquals("5", group.getBaseId());
+        assertEquals("5", group.getDisplayId());
+        assertEquals(1, group.getItemCount());
+        assertNotNull(group.getStartIndex());
+        assertNotNull(group.getEndIndex());
+    }
+
+    @Test
+    void test_group_dedup() {
+        // 同 baseId 但不同 groupKey（如跨块重复主 ID）：按 groupKey 分两个组，行不丢失
+        List<SimilarAsinParsedRowVo> rows = List.of(
+                row("k1", "1", "k1::1@2", 2, "B01A", "US"),
+                row("k1", "1_1", "k1::1@5", 5, "B01B", "DE"));
+
+        List<SimilarAsinParsedGroupVo> groups = SimilarAsinGroupingConverter.convert(rows);
+
+        assertEquals(2, groups.size(), "同 baseId 不同 groupKey 分行两组");
+        assertEquals("1", groups.get(0).getBaseId());
+        assertEquals("1", groups.get(1).getBaseId());
+        assertEquals(2, groups.get(0).getItemCount() + groups.get(1).getItemCount(), "行总数不丢");
+    }
+
+    @Test
+    void test_group_order() {
+        List<SimilarAsinParsedRowVo> rows = new ArrayList<>();
+        rows.add(row("k1", "1", "k1::1@2", 2, "B01A", "US"));
+        rows.add(row("k1", "3", "k1::3@3", 3, "B01C", "FR"));
+        rows.add(row("k1", "2", "k1::2@4", 4, "B01B", "DE"));
+
+        List<SimilarAsinParsedGroupVo> groups = SimilarAsinGroupingConverter.convert(rows);
+
+        assertEquals(3, groups.size());
+        assertEquals(List.of("1", "3", "2"), groups.stream().map(g -> g.getBaseId()).toList(),
+                "分组顺序保持行首次出现顺序");
+    }
+
+    @Test
+    void test_group_missing_key() {
+        // 缺 groupKey → 以 displayId 的 baseId 兜底；displayId 也缺 → sourceId 兜底
+        List<SimilarAsinParsedRowVo> noGroupKey = List.of(row("k1", "4_1", null, 2, "B01A", "US"));
+        List<SimilarAsinParsedGroupVo> groups1 = SimilarAsinGroupingConverter.convert(noGroupKey);
+        assertEquals(1, groups1.size());
+        assertEquals("4", groups1.get(0).getBaseId());
+        assertEquals("k1::4@2", groups1.get(0).getGroupKey(), "groupKey 缺失时按 buildGroupKey 兜底");
+        assertEquals("4_1", groups1.get(0).getDisplayId());
+
+        SimilarAsinParsedRowVo noDisplayId = new SimilarAsinParsedRowVo();
+        noDisplayId.setSourceFileKey("k1");
+        noDisplayId.setSourceFilename("f.xlsx");
+        noDisplayId.setSourceId("9_1");
+        noDisplayId.setRowIndex(5);
+        List<SimilarAsinParsedGroupVo> groups2 = SimilarAsinGroupingConverter.convert(List.of(noDisplayId));
+        assertEquals(1, groups2.size());
+        assertEquals("", groups2.get(0).getBaseId(), "displayId 缺失时 baseId 为空串（现状 baseId(null) 语义）");
+        assertEquals("9_1", groups2.get(0).getDisplayId(), "displayId 缺失时兜底 sourceId");
+        assertEquals("k1::@5", groups2.get(0).getGroupKey(), "groupKey 兜底按空 baseId 拼接（现状语义）");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/support/SimilarAsinHistoryAssemblerTest.java

@@ -0,0 +1,382 @@
+package com.nanri.aiimage.modules.similarasin.service.support;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.common.exception.BusinessException;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinHistoryItemVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import com.nanri.aiimage.modules.similarasin.service.SimilarAsinTaskService;
+import com.nanri.aiimage.modules.task.mapper.FileTaskMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskChunkMapper;
+import com.nanri.aiimage.modules.task.mapper.TaskScopeStateMapper;
+import com.nanri.aiimage.modules.task.model.entity.FileResultEntity;
+import com.nanri.aiimage.modules.task.model.entity.FileTaskEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskChunkEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskFileJobEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskProgressSnapshotEntity;
+import com.nanri.aiimage.modules.task.model.entity.TaskScopeStateEntity;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.task.service.TaskProgressSnapshotService;
+import com.nanri.aiimage.modules.task.service.TransientPayloadStorageService;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.time.LocalDateTime;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyList;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.mockito.ArgumentMatchers.isNull;
+import org.mockito.ArgumentCaptor;
+import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
+
+/**
+ * 任务 91：SimilarAsinHistoryAssembler 历史查询组装器。
+ * history 列表 VO 拼装（toHistoryItem + 进度链）抽到独立组件；只读不落库；输出与现状一致。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinHistoryAssemblerTest {
+
+    @Mock private TaskScopeStateMapper taskScopeStateMapper;
+    @Mock private TaskChunkMapper taskChunkMapper;
+    @Mock private FileTaskMapper fileTaskMapper;
+    @Mock private TaskProgressSnapshotService taskProgressSnapshotService;
+    @Mock private OssStorageService ossStorageService;
+    @Mock private TransientPayloadStorageService transientPayloadStorageService;
+    private ObjectMapper objectMapper = new ObjectMapper();
+
+    private SimilarAsinHistoryAssembler assembler;
+
+    @BeforeEach
+    void setUp() {
+        com.baomidou.mybatisplus.core.metadata.TableInfoHelper.initTableInfo(
+                new org.apache.ibatis.builder.MapperBuilderAssistant(
+                        new com.baomidou.mybatisplus.core.MybatisConfiguration(), ""),
+                TaskChunkEntity.class);
+        com.baomidou.mybatisplus.core.metadata.TableInfoHelper.initTableInfo(
+                new org.apache.ibatis.builder.MapperBuilderAssistant(
+                        new com.baomidou.mybatisplus.core.MybatisConfiguration(), ""),
+                TaskScopeStateEntity.class);
+        com.baomidou.mybatisplus.core.metadata.TableInfoHelper.initTableInfo(
+                new org.apache.ibatis.builder.MapperBuilderAssistant(
+                        new com.baomidou.mybatisplus.core.MybatisConfiguration(), ""),
+                FileTaskEntity.class);
+        assembler = new SimilarAsinHistoryAssembler(
+                taskScopeStateMapper, taskChunkMapper, fileTaskMapper, taskProgressSnapshotService,
+                ossStorageService, transientPayloadStorageService, objectMapper);
+        lenient().when(ossStorageService.generateFreshDownloadUrl(anyString())).thenAnswer(inv -> "https://oss/" + inv.getArgument(0));
+        lenient().when(taskChunkMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(taskScopeStateMapper.selectList(any())).thenReturn(List.of());
+        lenient().when(taskScopeStateMapper.selectCount(any())).thenReturn(0L);
+        lenient().when(fileTaskMapper.selectById(any())).thenReturn(null);
+    }
+
+    @AfterEach
+    void tearDown() {
+    }
+
+    private static FileResultEntity result(Long id, Long taskId, String source, String resultFileUrl, Integer success) {
+        FileResultEntity row = new FileResultEntity();
+        row.setId(id);
+        row.setTaskId(taskId);
+        row.setSourceFilename(source);
+        row.setResultFilename(source == null ? null : source.replace(".xlsx", "-result.xlsx"));
+        row.setResultFileUrl(resultFileUrl);
+        row.setSuccess(success);
+        row.setErrorMessage(null);
+        row.setRowCount(12);
+        row.setCreatedAt(LocalDateTime.of(2026, 8, 1, 10, 0));
+        return row;
+    }
+
+    private static FileTaskEntity task(Long id, String status, LocalDateTime createdAt) {
+        FileTaskEntity task = new FileTaskEntity();
+        task.setId(id);
+        task.setTaskNo("T" + id);
+        task.setModuleType("SIMILAR_ASIN");
+        task.setStatus(status);
+        task.setCreatedAt(createdAt);
+        task.setFinishedAt(createdAt == null ? null : createdAt.plusMinutes(5));
+        return task;
+    }
+
+    private static TaskFileJobEntity job(Long id, String status) {
+        TaskFileJobEntity job = new TaskFileJobEntity();
+        job.setId(id);
+        job.setStatus(status);
+        job.setErrorMessage(null);
+        return job;
+    }
+
+    private static Map<Long, TaskFileJobEntity> jobMap() {
+        return new LinkedHashMap<>();
+    }
+
+    @Test
+    void test_assembler_history_items() {
+        Map<Long, FileTaskEntity> taskMap = new LinkedHashMap<>();
+        taskMap.put(10L, task(10L, "SUCCESS", LocalDateTime.of(2026, 8, 1, 9, 0)));
+        Map<Long, TaskFileJobEntity> jobMap = new LinkedHashMap<>();
+
+        List<SimilarAsinHistoryItemVo> items = assembler.buildHistoryItems(
+                List.of(result(100L, 10L, "a.xlsx", "result/10/a.xlsx", 1)),
+                taskMap, jobMap);
+
+        assertEquals(1, items.size());
+        SimilarAsinHistoryItemVo item = items.get(0);
+        assertEquals(100L, item.getResultId());
+        assertEquals(10L, item.getTaskId());
+        assertEquals("a.xlsx", item.getSourceFilename());
+        assertEquals("a-result.xlsx", item.getResultFilename());
+        assertEquals("SUCCESS", item.getTaskStatus());
+        assertEquals(Boolean.TRUE, item.getSuccess());
+        assertEquals(12, item.getRowCount());
+        assertEquals("2026-08-01T10:00", item.getCreatedAt());
+        assertEquals("2026-08-01T09:00", item.getStartedAt(), "任务开始时间复用 task.createdAt");
+        assertEquals("2026-08-01T09:05", item.getFinishedAt(), "任务结束时间取 task.finishedAt");
+    }
+
+    @Test
+    void test_assembler_no_result() {
+        List<SimilarAsinHistoryItemVo> items = assembler.buildHistoryItems(
+                List.of(), new LinkedHashMap<>(), new LinkedHashMap<>());
+        assertTrue(items.isEmpty(), "无结果返回空列表");
+    }
+
+    @Test
+    void test_assembler_file_state() {
+        FileResultEntity row = result(100L, 10L, "a.xlsx", "result/10/a.xlsx", 1);
+        Map<Long, TaskFileJobEntity> jobMap = new LinkedHashMap<>();
+        jobMap.put(100L, job(7L, "RUNNING"));
+
+        SimilarAsinHistoryItemVo item = assembler.buildHistoryItems(
+                List.of(row), Map.of(10L, task(10L, "SUCCESS", null)), jobMap).get(0);
+
+        assertTrue(item.getFileReady(), "结果文件就绪");
+        assertEquals(7L, item.getFileJobId());
+        assertEquals("RUNNING", item.getFileStatus());
+        assertEquals(Integer.valueOf(100), item.getFileProgressPercent(), "就绪即 100%");
+        assertEquals("结果文件已生成", item.getFileProgressMessage());
+    }
+
+    @Test
+    void test_assembler_order() {
+        Map<Long, FileTaskEntity> taskMap = new LinkedHashMap<>();
+        taskMap.put(1L, task(1L, "SUCCESS", null));
+        taskMap.put(2L, task(2L, "SUCCESS", null));
+
+        List<SimilarAsinHistoryItemVo> items = assembler.buildHistoryItems(
+                List.of(result(200L, 2L, "b.xlsx", null, 1), result(100L, 1L, "a.xlsx", null, 1)),
+                taskMap, jobMap());
+
+        assertEquals(2, items.size());
+        assertEquals(200L, items.get(0).getResultId(), "输入顺序保持");
+        assertEquals(100L, items.get(1).getResultId());
+    }
+
+    @Test
+    void test_assembler_null_task() {
+        FileResultEntity row = result(100L, 10L, "a.xlsx", null, 1);
+        row.setCreatedAt(LocalDateTime.of(2026, 8, 1, 11, 0));
+        // taskMap 空 → 缺 task
+        SimilarAsinHistoryItemVo item = assembler.buildHistoryItems(
+                List.of(row), new LinkedHashMap<>(), new LinkedHashMap<>()).get(0);
+
+        assertNull(item.getTaskStatus(), "缺 task 状态为空");
+        assertEquals("2026-08-01T11:00", item.getStartedAt(), "缺 task 回退 result.createdAt");
+        assertNull(item.getFinishedAt(), "缺 task 无结束时间");
+    }
+
+    @Test
+    void test_assembler_download_url() {
+        FileResultEntity row = result(100L, 10L, "a.xlsx", "result/10/a.xlsx", 1);
+        Map<Long, TaskFileJobEntity> jobMap = new LinkedHashMap<>();
+
+        SimilarAsinHistoryItemVo item = assembler.buildHistoryItems(
+                List.of(row), Map.of(10L, task(10L, "SUCCESS", null)), jobMap).get(0);
+
+        assertEquals("https://oss/result/10/a.xlsx", item.getDownloadUrl(), "下载 URL 由 oss 服务生成");
+        verify(ossStorageService).generateFreshDownloadUrl("result/10/a.xlsx");
+    }
+
+    @Test
+    void test_assembler_download_url_blank_result_file() {
+        FileResultEntity row = result(100L, 10L, "a.xlsx", null, 1);
+
+        SimilarAsinHistoryItemVo item = assembler.buildHistoryItems(
+                List.of(row), Map.of(10L, task(10L, "SUCCESS", null)), jobMap()).get(0);
+
+        assertNull(item.getDownloadUrl(), "无结果文件 URL 时下载地址为空");
+        verify(ossStorageService, never()).generateFreshDownloadUrl(anyString());
+    }
+
+    @Test
+    void test_assembler_immutable_input() {
+        FileResultEntity row = result(100L, 10L, "a.xlsx", "result/10/a.xlsx", 1);
+        Map<Long, FileTaskEntity> taskMap = new LinkedHashMap<>();
+        taskMap.put(10L, task(10L, "SUCCESS", LocalDateTime.of(2026, 8, 1, 9, 0)));
+        String originalTaskNo = taskMap.get(10L).getTaskNo();
+
+        assembler.buildHistoryItems(List.of(row), taskMap, jobMap());
+
+        assertEquals(originalTaskNo, taskMap.get(10L).getTaskNo(), "task 不被修改");
+        assertEquals("a.xlsx", row.getSourceFilename(), "result 不被修改");
+    }
+
+    @Test
+    void test_assembler_pending_skip() {
+        Map<Long, FileTaskEntity> taskMap = new LinkedHashMap<>();
+        taskMap.put(10L, task(10L, "PENDING", null));
+        taskMap.put(11L, task(11L, "RUNNING", null));
+
+        List<SimilarAsinHistoryItemVo> items = assembler.buildHistoryItems(
+                List.of(result(100L, 10L, "a.xlsx", null, 0), result(101L, 11L, "b.xlsx", null, 0)),
+                taskMap, jobMap());
+
+        assertEquals(1, items.size(), "PENDING 任务历史项被跳过");
+        assertEquals(101L, items.get(0).getResultId());
+    }
+
+    @Test
+    void test_assembler_file_error_attached() {
+        TaskFileJobEntity failedJob = job(9L, "FAILED");
+        failedJob.setErrorMessage("assemble boom");
+        Map<Long, TaskFileJobEntity> jobMap = new LinkedHashMap<>();
+        jobMap.put(100L, failedJob);
+        FileResultEntity row = result(100L, 10L, "a.xlsx", null, 0);
+        Map<Long, FileTaskEntity> taskMap = new LinkedHashMap<>();
+        taskMap.put(10L, task(10L, "RUNNING", LocalDateTime.of(2026, 8, 1, 9, 0)));
+
+        SimilarAsinHistoryItemVo item = assembler.buildHistoryItems(
+                List.of(row), taskMap, jobMap).get(0);
+
+        assertEquals("FAILED", item.getFileStatus(), "job 失败状态附带");
+        assertEquals("assemble boom", item.getFileError(), "job 错误信息附带");
+    }
+
+    @Test
+    void test_assembler_consistency() {
+        // 与现状 toHistoryItem 行为一致：success 字段、rowCount、error、时间兜底
+        FileResultEntity row = result(100L, 10L, "a.xlsx", "result/10/a.xlsx", 0);
+        row.setErrorMessage("python timeout");
+        row.setCreatedAt(LocalDateTime.of(2026, 8, 1, 10, 0));
+        Map<Long, FileTaskEntity> taskMap = new LinkedHashMap<>();
+        taskMap.put(10L, task(10L, "FAILED", LocalDateTime.of(2026, 8, 1, 9, 30)));
+
+        SimilarAsinHistoryItemVo item = assembler.buildHistoryItems(
+                List.of(row), taskMap, jobMap()).get(0);
+
+        assertEquals(Boolean.FALSE, item.getSuccess());
+        assertEquals("python timeout", item.getError());
+        assertEquals("FAILED", item.getTaskStatus());
+        assertEquals(12, item.getRowCount());
+    }
+
+    @Test
+    void test_assembler_python_upload_row_fallback() {
+        // scope 状态存在但无分片数 → chunk 进度 (0,0) → 回退 fileTask 载荷行数（单位"行"）
+        FileTaskEntity t = new FileTaskEntity();
+        t.setId(10L);
+        t.setResultJson("{\"parsedPayloadRef\":\"ref:payload\",\"allItems\":[]}");
+        FileResultEntity row = result(100L, 10L, "a.xlsx", null, 0);
+        SimilarAsinParsedRowVo parsed = new SimilarAsinParsedRowVo();
+        parsed.setDisplayId("B01X");
+        parsed.setAsin("B01X");
+        parsed.setCountry("US");
+        parsed.setRowToken("uploads/main.xlsx::row::2");
+        String payloadJson;
+        try {
+            payloadJson = objectMapper.writeValueAsString(
+                    Map.of("items", List.of(parsed), "allItems", List.of()));
+        } catch (Exception ex) {
+            throw new AssertionError(ex);
+        }
+        TaskScopeStateEntity state = new TaskScopeStateEntity();
+        state.setTaskId(10L);
+        state.setModuleType("SIMILAR_ASIN");
+        state.setChunkTotal(0);
+        state.setReceivedChunkCount(0);
+
+        when(fileTaskMapper.selectById(10L)).thenReturn(t);
+        when(transientPayloadStorageService.resolvePayload("ref:payload", "read similar ASIN parsed payload failed"))
+                .thenReturn(payloadJson);
+        when(taskScopeStateMapper.selectList(any())).thenReturn(List.of(state));
+
+        SimilarAsinHistoryItemVo item = assembler.buildHistoryItems(
+                List.of(row), Map.of(10L, task(10L, "RUNNING", null)), jobMap()).get(0);
+
+        assertEquals(0, item.getFileProgressCurrent(), "无已提交行");
+        assertEquals(1, item.getFileProgressTotal(), "载荷总行数 1");
+        assertTrue(item.getFileProgressMessage().endsWith(" 行"), "回退路径单位应为'行'，实际: " + item.getFileProgressMessage());
+        assertEquals(Integer.valueOf(1), item.getFileProgressPercent(), "0 行时百分比 1");
+    }
+
+    @Test
+    void test_assembler_python_upload_no_task_no_chunk() {
+        // task 与 chunk 都拿不到 → 0/0 行单位，不抛异常
+        FileResultEntity row = result(100L, 10L, "a.xlsx", null, 0);
+        SimilarAsinHistoryItemVo item = assembler.buildHistoryItems(
+                List.of(row), Map.of(10L, task(10L, "RUNNING", null)), jobMap()).get(0);
+
+        assertEquals(0, item.getFileProgressCurrent());
+        assertEquals(1, item.getFileProgressTotal(), "0 行时 total 兜底 1");
+        assertTrue(item.getFileProgressMessage().endsWith(" 行"), "无 task 无 chunk 仍按行回退，实际: " + item.getFileProgressMessage());
+    }
+
+    @Test
+    void test_assembler_chunk_read_failure_records_error() {
+        // 回退路径读 chunk 载荷失败 → 抛 BusinessException 且 last_error 留痕
+        FileTaskEntity t = new FileTaskEntity();
+        t.setId(10L);
+        t.setResultJson("{}");
+        TaskChunkEntity chunk = new TaskChunkEntity();
+        chunk.setTaskId(10L);
+        chunk.setModuleType("SIMILAR_ASIN");
+        chunk.setScopeHash("s1");
+        chunk.setChunkIndex(2);
+        chunk.setPayloadJson("ref:missing");
+        TaskScopeStateEntity state = new TaskScopeStateEntity();
+        state.setTaskId(10L);
+        state.setModuleType("SIMILAR_ASIN");
+        state.setChunkTotal(0);
+        state.setReceivedChunkCount(0);
+        TaskScopeStateEntity scope = new TaskScopeStateEntity();
+        scope.setId(55L);
+        scope.setLastError("");
+        FileResultEntity row = result(100L, 10L, "a.xlsx", null, 0);
+
+        when(fileTaskMapper.selectById(10L)).thenReturn(t);
+        when(transientPayloadStorageService.resolvePayload("ref:missing", "read similar ASIN chunk failed"))
+                .thenThrow(new IllegalStateException("payload only exists on instance=server-110"));
+        when(taskScopeStateMapper.selectList(any())).thenReturn(List.of(state));
+        when(taskScopeStateMapper.selectOne(any())).thenReturn(scope);
+        when(taskChunkMapper.selectList(any())).thenReturn(List.of(chunk));
+
+        BusinessException thrown = assertThrows(BusinessException.class,
+                () -> assembler.buildHistoryItems(List.of(row), Map.of(10L, task(10L, "RUNNING", null)), jobMap()));
+        assertTrue(thrown.getMessage().contains("chunk=2"), "异常附带 chunk 索引，实际: " + thrown.getMessage());
+
+        ArgumentCaptor<LambdaUpdateWrapper<TaskScopeStateEntity>> captor =
+                ArgumentCaptor.forClass(LambdaUpdateWrapper.class);
+        verify(taskScopeStateMapper).update(isNull(), captor.capture());
+        String written = String.join("|", captor.getValue().getParamNameValuePairs().values().stream()
+                .map(String::valueOf).toList());
+        assertTrue(written.contains("chunk-read-failed[2@cross-instance]"), "跨实例标记留痕，实际: " + written);
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/support/SimilarAsinRowNormalizerTest.java

@@ -0,0 +1,76 @@
+package com.nanri.aiimage.modules.similarasin.service.support;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * 任务 85：SimilarAsinRowNormalizer 字段归一化器。
+ * trim/大小写/ASIN 格式统一，规则与现状 Service.normalize 完全一致（BOM 剥离、全角空格转半角、
+ * 连续空白折叠为单空格），纯函数无状态，幂等。
+ */
+class SimilarAsinRowNormalizerTest {
+
+    @Test
+    void test_trim_whitespace() {
+        assertEquals("abc", SimilarAsinRowNormalizer.normalize("  abc  "));
+        assertEquals("abc", SimilarAsinRowNormalizer.normalize("\tabc\n"));
+        assertEquals("", SimilarAsinRowNormalizer.normalize("   "));
+    }
+
+    @Test
+    void test_lowercase_asin() {
+        assertEquals("B01ABC", SimilarAsinRowNormalizer.normalizeAsin("b01abc"));
+        assertEquals("B01ABC", SimilarAsinRowNormalizer.normalizeAsin("b01abc "));
+    }
+
+    @Test
+    void test_mixed_case_asin() {
+        assertEquals("B01ABC", SimilarAsinRowNormalizer.normalizeAsin("b01AbC"));
+        assertEquals("B01MIXED1", SimilarAsinRowNormalizer.normalizeAsin(" b01MiXeD1 "));
+    }
+
+    @Test
+    void test_internal_whitespace_kept() {
+        assertEquals("ab cd", SimilarAsinRowNormalizer.normalize("ab cd"), "内部单空格保留");
+        assertEquals("ab cd", SimilarAsinRowNormalizer.normalize("ab  cd"), "连续空白折叠为单空格（现状）");
+        assertEquals("ab cd", SimilarAsinRowNormalizer.normalize("ab　cd"), "全角空格转半角");
+    }
+
+    @Test
+    void test_null_safe() {
+        assertEquals("", SimilarAsinRowNormalizer.normalize(null));
+        assertEquals("", SimilarAsinRowNormalizer.normalizeAsin(null));
+        assertEquals("", SimilarAsinRowNormalizer.normalizeAsin(" "), "空白 ASIN 归一后为空（trim 先行）");
+    }
+
+    @Test
+    void test_empty_string() {
+        assertEquals("", SimilarAsinRowNormalizer.normalize(""));
+        assertEquals("", SimilarAsinRowNormalizer.normalizeAsin(""));
+        assertEquals("", SimilarAsinRowNormalizer.normalizeAsin(""));
+    }
+
+    @Test
+    void test_special_chars_untouched() {
+        assertEquals("a@#$%^&*()", SimilarAsinRowNormalizer.normalize(" a@#$%^&*() "));
+        assertEquals("A@#$%^&*()", SimilarAsinRowNormalizer.normalizeAsin("a@#$%^&*()"));
+        assertEquals("B01/AB-C_1", SimilarAsinRowNormalizer.normalizeAsin("b01/ab-c_1"), "连字符/下划线/斜杠保留");
+    }
+
+    @Test
+    void test_normalize_identity_after() {
+        String[] samples = {"abc", "  abc  ", "b01AbC", "ab  cd", "x　y ", "a@#$%^&*()", "", "   "};
+        for (String sample : samples) {
+            String once = SimilarAsinRowNormalizer.normalize(sample);
+            assertEquals(once, SimilarAsinRowNormalizer.normalize(once),
+                    "normalize 幂等: input=" + sample);
+            String asinOnce = SimilarAsinRowNormalizer.normalizeAsin(sample);
+            assertEquals(asinOnce, SimilarAsinRowNormalizer.normalizeAsin(asinOnce),
+                    "normalizeAsin 幂等: input=" + sample);
+        }
+        assertTrue(SimilarAsinRowNormalizer.normalize(" a  b ").equals(SimilarAsinRowNormalizer.normalize("a b")),
+                "不同空白形态归一到同一结果");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/support/SimilarAsinRowValidatorTest.java

@@ -0,0 +1,131 @@
+package com.nanri.aiimage.modules.similarasin.service.support;
+
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import com.nanri.aiimage.modules.similarasin.service.support.SimilarAsinRowValidator.RowError;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * 任务 87：SimilarAsinRowValidator 纯校验器。
+ * 必填检查（id/asin/country）、ASIN 格式校验（大写字母数字）、重复检测（asin+country 键，保留首次）；
+ * 返回错误清单不抛异常。规则与现状 parseWorkbook/dedupeRowsByRowKey 一致：
+ * 全空白行跳过、必填缺失即记错、重复仅标记后续出现、格式只拦非字母数字。
+ */
+class SimilarAsinRowValidatorTest {
+
+    private static SimilarAsinParsedRowVo row(String sourceId, String asin, String country) {
+        SimilarAsinParsedRowVo vo = new SimilarAsinParsedRowVo();
+        vo.setSourceFileKey("k1");
+        vo.setSourceFilename("f.xlsx");
+        vo.setRowIndex(2);
+        vo.setSourceId(sourceId);
+        vo.setDisplayId(sourceId);
+        vo.setAsin(asin);
+        vo.setCountry(country);
+        vo.setValues(new LinkedHashMap<>());
+        return vo;
+    }
+
+    private static List<String> columns(List<RowError> errors) {
+        return errors.stream().map(RowError::column).toList();
+    }
+
+    @Test
+    void test_validate_required_present() {
+        List<SimilarAsinParsedRowVo> rows = List.of(
+                row("1", "B01A", "US"),
+                row("2", "B01B", "DE"));
+
+        List<RowError> errors = SimilarAsinRowValidator.validate(rows);
+
+        assertTrue(errors.isEmpty(), "必填齐全通过");
+    }
+
+    @Test
+    void test_validate_required_missing() {
+        List<SimilarAsinParsedRowVo> rows = List.of(
+                row("", "B01A", "US"),
+                row("2", "", "DE"),
+                row("3", "B01C", " "));
+
+        List<RowError> errors = SimilarAsinRowValidator.validate(rows);
+
+        assertEquals(3, errors.size(), "缺 id / asin / country 各记一错");
+        assertEquals(List.of("id", "asin", "country"), columns(errors));
+    }
+
+    @Test
+    void test_validate_asin_format() {
+        List<SimilarAsinParsedRowVo> rows = List.of(
+                row("1", "B0A-1B2C3D", "US"),
+                row("2", "B0A 1B2C3D", "DE"));
+
+        List<RowError> errors = SimilarAsinRowValidator.validate(rows);
+
+        assertEquals(2, errors.size(), "非字母数字 ASIN 记格式错");
+        assertEquals(List.of("asin", "asin"), columns(errors));
+    }
+
+    @Test
+    void test_validate_duplicates() {
+        List<SimilarAsinParsedRowVo> rows = List.of(
+                row("1", "B01A", "US"),
+                row("2", "b01a", "US"),
+                row("3", "B01A", "DE"),
+                row("4", "B01C", "US"));
+
+        List<RowError> errors = SimilarAsinRowValidator.validate(rows);
+
+        assertEquals(1, errors.size(), "仅重复的后续出现记错");
+        assertEquals("asin", errors.get(0).column());
+        assertTrue(errors.get(0).message().contains("B01A"), "重复消息含 ASIN: " + errors.get(0).message());
+        assertTrue(errors.get(0).message().contains("US"), "重复消息含国家: " + errors.get(0).message());
+    }
+
+    @Test
+    void test_validate_blank_row() {
+        List<SimilarAsinParsedRowVo> rows = List.of(row("", "", ""));
+
+        List<RowError> errors = SimilarAsinRowValidator.validate(rows);
+
+        assertTrue(errors.isEmpty(), "全空白行跳过（与 parse 一致）");
+    }
+
+    @Test
+    void test_validate_no_error_happy() {
+        List<SimilarAsinParsedRowVo> rows = new ArrayList<>();
+        rows.add(row("1_1", "B01A", "US"));
+        rows.add(row("1_2", "B01B", "DE"));
+        rows.add(row("2", "B01C", "FR"));
+        rows.add(row("3", "B01D", "JP"));
+
+        List<RowError> errors = SimilarAsinRowValidator.validate(rows);
+
+        assertTrue(errors.isEmpty());
+    }
+
+    @Test
+    void test_validate_error_detail() {
+        List<SimilarAsinParsedRowVo> rows = List.of(row("", "B01A", "US"));
+
+        List<RowError> errors = SimilarAsinRowValidator.validate(rows);
+
+        assertEquals(1, errors.size());
+        RowError error = errors.get(0);
+        assertEquals(2, error.rowIndex(), "错误含 1 基行号");
+        assertEquals("id", error.column());
+        assertTrue(!error.message().isBlank(), "错误含消息");
+    }
+
+    @Test
+    void test_validate_null_input() {
+        assertTrue(SimilarAsinRowValidator.validate(null).isEmpty());
+        assertTrue(SimilarAsinRowValidator.validate(List.of()).isEmpty());
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/support/SimilarAsinSheetBuilderTest.java

@@ -0,0 +1,219 @@
+package com.nanri.aiimage.modules.similarasin.service.support;
+
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.CellStyle;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+import org.apache.poi.xssf.streaming.SXSSFWorkbook;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * 任务 88：SimilarAsinSheetBuilder Sheet 构造器。
+ * 结果 Workbook/Sheet 构造辅助（表头、列顺序、样式）；输入数据 → 输出 workbook；不落库、无 IO 依赖。
+ * 表头/列序/样式与现状 assembleResultWorkbook 一致：sheet 名"相似asin检测"、15 列表头、加粗表头、
+ * 数据行从第 1 行、图片列 12-14 列宽、行高 409pt、值兜底与现状一致。
+ */
+class SimilarAsinSheetBuilderTest {
+
+    private SXSSFWorkbook lastWorkbook;
+
+    @AfterEach
+    void closeWorkbook() throws Exception {
+        if (lastWorkbook != null) {
+            lastWorkbook.close();
+        }
+    }
+
+    private static SimilarAsinParsedRowVo row(String displayId, String asin, String country, String price,
+                                              String seller, String brand) {
+        SimilarAsinParsedRowVo vo = new SimilarAsinParsedRowVo();
+        vo.setSourceFileKey("k1");
+        vo.setSourceFilename("f.xlsx");
+        vo.setRowIndex(2);
+        vo.setSourceId(displayId);
+        vo.setDisplayId(displayId);
+        vo.setAsin(asin);
+        vo.setCountry(country);
+        vo.setPrice(price);
+        LinkedHashMap<String, String> values = new LinkedHashMap<>();
+        values.put("卖家名称", seller);
+        values.put("品牌", brand);
+        vo.setValues(values);
+        return vo;
+    }
+
+    private Workbook build(List<SimilarAsinParsedRowVo> rows) {
+        SXSSFWorkbook workbook = new SXSSFWorkbook(200);
+        lastWorkbook = workbook;
+        SimilarAsinSheetBuilder.build(workbook, rows);
+        return workbook;
+    }
+
+    private static String cellString(Workbook workbook, int row, int col) {
+        Sheet sheet = workbook.getSheetAt(0);
+        Row r = sheet.getRow(row);
+        if (r == null) {
+            return null;
+        }
+        Cell c = r.getCell(col);
+        return c == null ? null : c.getStringCellValue();
+    }
+
+    @Test
+    void test_build_headers() {
+        Workbook workbook = build(List.of());
+
+        Sheet sheet = workbook.getSheetAt(0);
+        assertNotNull(sheet, "sheet 存在");
+        assertEquals("相似asin检测", sheet.getSheetName());
+        Row header = sheet.getRow(0);
+        assertNotNull(header);
+        List<String> headers = new ArrayList<>();
+        header.forEach(cell -> headers.add(cell.getStringCellValue()));
+        assertEquals(List.of("id", "asin", "国家", "价格", "卖家名称", "品牌", "是否有货", "相似度",
+                "是否符合类目", "不符合理由", "产品类目", "状态", "主图", "阿里巴巴图片1", "阿里巴巴图片2"),
+                headers, "表头与现状 RESULT_HEADERS 一致");
+    }
+
+    @Test
+    void test_build_header_style_bold() {
+        Workbook workbook = build(List.of());
+
+        Sheet sheet = workbook.getSheetAt(0);
+        CellStyle style = sheet.getRow(0).getCell(0).getCellStyle();
+        assertTrue(workbook.getFontAt(style.getFontIndex()).getBold(), "表头加粗");
+        CellStyle style2 = sheet.getRow(0).getCell(14).getCellStyle();
+        assertTrue(workbook.getFontAt(style2.getFontIndex()).getBold(), "末列表头也加粗");
+    }
+
+    @Test
+    void test_build_data_rows() {
+        Workbook workbook = build(List.of(
+                row("1", "B01A", "US", "19.9", "卖家1", "品牌1"),
+                row("2", "B01B", "DE", "9.9", "卖家2", "品牌2")));
+
+        Sheet sheet = workbook.getSheetAt(0);
+        assertEquals(3, sheet.getLastRowNum() + 1, "表头 + 2 数据行");
+        assertEquals("1", cellString(workbook, 1, 0));
+        assertEquals("B01A", cellString(workbook, 1, 1));
+        assertEquals("US", cellString(workbook, 1, 2));
+        assertEquals("19.9", cellString(workbook, 1, 3));
+        assertEquals("卖家1", cellString(workbook, 1, 4));
+        assertEquals("品牌1", cellString(workbook, 1, 5));
+        assertEquals("2", cellString(workbook, 2, 0));
+        assertEquals("B01B", cellString(workbook, 2, 1));
+    }
+
+    @Test
+    void test_build_empty_rows() {
+        Workbook workbook = build(List.of());
+
+        Sheet sheet = workbook.getSheetAt(0);
+        assertEquals(1, sheet.getLastRowNum() + 1, "无数据行时只有表头");
+        assertNull(sheet.getRow(1), "无第 1 行");
+    }
+
+    @Test
+    void test_build_missing_values_fallback() {
+        // displayId 缺失 → 兜底 sourceId；asin/country 空白 → 空串；values 缺失 → 空串
+        SimilarAsinParsedRowVo vo = new SimilarAsinParsedRowVo();
+        vo.setSourceFileKey("k1");
+        vo.setSourceFilename("f.xlsx");
+        vo.setRowIndex(2);
+        vo.setSourceId("9_1");
+        vo.setDisplayId("");
+        vo.setAsin("");
+        vo.setCountry("");
+
+        Workbook workbook = build(List.of(vo));
+
+        assertEquals("9_1", cellString(workbook, 1, 0), "displayId 空白兜底 sourceId");
+        assertEquals("", cellString(workbook, 1, 1));
+        assertEquals("", cellString(workbook, 1, 2));
+        assertEquals("", cellString(workbook, 1, 4), "卖家名称空白");
+        assertEquals("", cellString(workbook, 1, 5), "品牌空白");
+    }
+
+    @Test
+    void test_build_image_columns_width() {
+        Workbook workbook = build(List.of());
+
+        Sheet sheet = workbook.getSheetAt(0);
+        assertEquals(SimilarAsinImageEmbedder.IMAGE_COL_WIDTH_CHARS * 256, sheet.getColumnWidth(12), "主图列宽");
+        assertEquals(SimilarAsinImageEmbedder.IMAGE_COL_WIDTH_CHARS * 256, sheet.getColumnWidth(13), "图1列宽");
+        assertEquals(SimilarAsinImageEmbedder.IMAGE_COL_WIDTH_CHARS * 256, sheet.getColumnWidth(14), "图2列宽");
+    }
+
+    @Test
+    void test_build_column_order() {
+        Workbook workbook = build(List.of(row("1", "B01A", "US", "19.9", "卖家1", "品牌1")));
+
+        assertEquals("id", cellString(workbook, 0, 0));
+        assertEquals("asin", cellString(workbook, 0, 1));
+        assertEquals("国家", cellString(workbook, 0, 2));
+        assertEquals("价格", cellString(workbook, 0, 3));
+        assertEquals("状态", cellString(workbook, 0, 11));
+        assertEquals("主图", cellString(workbook, 0, 12));
+        assertEquals("阿里巴巴图片2", cellString(workbook, 0, 14));
+        assertEquals("B01A", cellString(workbook, 1, 1), "asin 在第 1 列");
+        assertNull(cellString(workbook, 1, 11), "状态列由调用方补写，builder 不创建");
+    }
+
+    @Test
+    void test_build_result_columns_blank_without_result() {
+        // 结果派生列（是否有货/相似度/是否符合类目/不符合理由/产品类目/状态）来自 LLM 结果行，
+        // builder 输入只有解析行 → 这些列不创建（现状无 resultRow 时调用方同样置空串）。
+        Workbook workbook = build(List.of(row("1", "B01A", "US", "19.9", "卖家1", "品牌1")));
+
+        assertNull(cellString(workbook, 1, 6));
+        assertNull(cellString(workbook, 1, 7));
+        assertNull(cellString(workbook, 1, 8));
+        assertNull(cellString(workbook, 1, 9));
+        assertNull(cellString(workbook, 1, 10));
+        assertNull(cellString(workbook, 1, 11));
+    }
+
+    @Test
+    void test_build_value_by_header_contains() {
+        // 卖家名称/品牌从 values 映射按表头包含匹配读取（现状 readValueByHeader 语义）
+        SimilarAsinParsedRowVo vo = new SimilarAsinParsedRowVo();
+        vo.setSourceFileKey("k1");
+        vo.setSourceFilename("f.xlsx");
+        vo.setRowIndex(2);
+        vo.setSourceId("3");
+        vo.setDisplayId("3");
+        vo.setAsin("B01C");
+        vo.setCountry("FR");
+        vo.setPrice("");
+        LinkedHashMap<String, String> values = new LinkedHashMap<>();
+        values.put("卖家名称：亚马逊", "卖家X");
+        values.put("品牌/店铺", "品牌Y");
+        vo.setValues(values);
+
+        Workbook workbook = build(List.of(vo));
+
+        assertEquals("卖家X", cellString(workbook, 1, 4), "卖家名称按包含匹配");
+        assertEquals("品牌Y", cellString(workbook, 1, 5), "品牌按包含匹配");
+    }
+
+    @Test
+    void test_build_null_input() {
+        Workbook workbook = build(null);
+
+        Sheet sheet = workbook.getSheetAt(0);
+        assertEquals(1, sheet.getLastRowNum() + 1, "null 输入不写数据行");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/service/support/SimilarAsinSnapshotTest.java

@@ -0,0 +1,303 @@
+package com.nanri.aiimage.modules.similarasin.service.support;
+
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedGroupVo;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * 任务 90：抽取前后快照对比测试。
+ * 夹具 Excel → 解析结果快照（golden 文件）；同一夹具输出完全一致；快照变更即失败（防行为漂移）。
+ * golden 文件：src/test/resources/similarasin/golden/parse-snapshot.txt（全 parse 路径）
+ *            src/test/resources/similarasin/golden/groups-snapshot.txt（分组路径）
+ */
+class SimilarAsinSnapshotTest {
+
+    private static final File GOLDEN_PARSE =
+            new File("src/test/resources/similarasin/golden/parse-snapshot.txt");
+    private static final File GOLDEN_GROUPS =
+            new File("src/test/resources/similarasin/golden/groups-snapshot.txt");
+
+    private static final String[] HEADERS = {"id", "asin", "国家", "sku", "价格", "url", "标题"};
+
+    // ---- 夹具 ----
+
+    private static File workbook(String[] headers, List<String[]> rows) throws Exception {
+        File file = File.createTempFile("similar-asin-snapshot-", ".xlsx");
+        try (XSSFWorkbook wb = new XSSFWorkbook(); FileOutputStream out = new FileOutputStream(file)) {
+            Sheet sheet = wb.createSheet("Sheet1");
+            Row header = sheet.createRow(0);
+            for (int i = 0; i < headers.length; i++) {
+                header.createCell(i).setCellValue(headers[i]);
+            }
+            for (int r = 0; r < rows.size(); r++) {
+                Row row = sheet.createRow(r + 1);
+                for (int c = 0; c < rows.get(r).length; c++) {
+                    row.createCell(c).setCellValue(rows.get(r)[c]);
+                }
+            }
+            wb.write(out);
+        }
+        return file;
+    }
+
+    /** 5 有效行：2_1/2_2/2_3 同块、非法 ASIN 保留、单块多行。 */
+    private static File fixtureMain() throws Exception {
+        return workbook(HEADERS, List.of(
+                new String[]{"2_1", "B01A", "US", "SKU-1", "19.90", "http://img/a.jpg", "title a"},
+                new String[]{"2_2", "B01B", "DE", "SKU-2", "29.90", "http://img/b.jpg", "title b"},
+                new String[]{"2_3", "B01C", "FR", "SKU-3", "", "http://img/c.jpg", ""},
+                new String[]{"5", "B01-ABC", "UK", "SKU-4", "9.90", "http://img/d.jpg", "title d"},
+                new String[]{"6", "B01D", "US", "SKU-5", "1.00", "http://img/e.jpg", "title e"}));
+    }
+
+    /** 6 行含 5 类错误（缺 id/asin/国家、格式错、重复）+ 1 空行；解析后剩 3 有效行。 */
+    private static File fixtureError() throws Exception {
+        return workbook(HEADERS, List.of(
+                new String[]{"", "B02A", "US"},
+                new String[]{"9", "", "DE"},
+                new String[]{"10", "B02B", ""},
+                new String[]{"11", "B02-ABC", "FR"},
+                new String[]{"12", "B02C", "FR"},
+                new String[]{"13", "B02C", "FR"},
+                new String[]{"", "", ""}));
+    }
+
+    private static final List<String[]> GROUPS_FIXTURE = List.of(
+            new String[]{"1", "B10A", "US"},
+            new String[]{"2_1", "B11A", "DE"},
+            new String[]{"2_2", "B11B", "FR"});
+
+    private static File fixtureGroups() throws Exception {
+        return workbook(HEADERS, GROUPS_FIXTURE);
+    }
+
+    // ---- 解析管线（与服务侧 parseWorkbookDelegated 语义一致） ----
+
+    private static List<SimilarAsinParsedRowVo> toRows(File file, String fileKey, String filename,
+                                                       boolean dropInvalid) throws Exception {
+        SimilarAsinExcelParser.ParsedSheet parsed = new SimilarAsinExcelParser().parse(file);
+        List<SimilarAsinParsedRowVo> rows = new ArrayList<>();
+        String currentBlockBaseId = "";
+        String currentGroupKey = "";
+        for (SimilarAsinExcelParser.SimilarAsinExcelRow parsedRow : parsed.rows()) {
+            String id = parsedRow.id();
+            String asin = parsedRow.asin();
+            String country = parsedRow.country();
+            if (id.isBlank() && asin.isBlank() && country.isBlank()) {
+                continue;
+            }
+            if (dropInvalid && (id.isBlank() || asin.isBlank() || country.isBlank())) {
+                continue;
+            }
+            SimilarAsinParsedRowVo vo = new SimilarAsinParsedRowVo();
+            vo.setSourceFileKey(fileKey);
+            vo.setSourceFilename(filename);
+            vo.setRowIndex(parsedRow.rowIndex());
+            vo.setSourceId(id);
+            vo.setDisplayId(id.trim());
+            String rowBaseId = baseId(vo.getDisplayId());
+            if (!java.util.Objects.equals(currentBlockBaseId, rowBaseId)) {
+                currentBlockBaseId = rowBaseId;
+                currentGroupKey = buildGroupKey(fileKey, rowBaseId, vo.getRowIndex());
+            }
+            vo.setGroupKey(currentGroupKey);
+            vo.setRowToken(buildRowToken(fileKey, vo.getRowIndex()));
+            vo.setAsin(asin);
+            vo.setCountry(country);
+            vo.setSku(parsedRow.sku());
+            vo.setPrice(parsedRow.price());
+            vo.setUrl(parsedRow.url());
+            vo.setTitle(parsedRow.title());
+            vo.setValues(parsedRow.values());
+            rows.add(vo);
+        }
+        return rows;
+    }
+
+    private static String normalize(String val) {
+        return val == null ? "" : val.replace(String.valueOf((char) 0xFEFF), "").replace((char) 0x3000, ' ').trim().replaceAll("\\s+", " ");
+    }
+
+    private static String baseId(String id) {
+        String s = normalize(id);
+        int idx = s.indexOf('_');
+        return idx > 0 ? s.substring(0, idx) : s;
+    }
+
+    private static String buildRowToken(String sourceFileKey, Integer rowIndex) {
+        return normalize(sourceFileKey) + "::row::" + (rowIndex == null ? 0 : rowIndex);
+    }
+
+    private static String buildGroupKey(String sourceFileKey, String rowBaseId, Integer rowIndex) {
+        return normalize(sourceFileKey) + "::" + normalize(rowBaseId) + "@" + (rowIndex == null ? 0 : rowIndex);
+    }
+
+    // ---- 快照渲染 ----
+
+    private static String renderRow(SimilarAsinParsedRowVo row) {
+        return "  row: idx=" + row.getRowIndex()
+                + " sourceId=" + row.getSourceId()
+                + " displayId=" + row.getDisplayId()
+                + " asin=" + row.getAsin()
+                + " country=" + row.getCountry()
+                + " sku=" + row.getSku()
+                + " price=" + row.getPrice()
+                + " url=" + row.getUrl()
+                + " title=" + row.getTitle()
+                + " groupKey=" + row.getGroupKey()
+                + " rowToken=" + row.getRowToken()
+                + " values.size=" + (row.getValues() == null ? 0 : row.getValues().size());
+    }
+
+    private static String renderGroup(SimilarAsinParsedGroupVo group) {
+        return "  group: fileKey=" + group.getSourceFileKey()
+                + " filename=" + group.getSourceFilename()
+                + " groupKey=" + group.getGroupKey()
+                + " baseId=" + group.getBaseId()
+                + " displayId=" + group.getDisplayId()
+                + " itemCount=" + group.getItemCount()
+                + " range=[" + group.getStartIndex() + "," + group.getEndIndex() + ")";
+    }
+
+    private static String renderFull(List<SimilarAsinParsedRowVo> rows, List<SimilarAsinParsedGroupVo> groups) {
+        StringBuilder sb = new StringBuilder();
+        sb.append("rows=").append(rows.size()).append('\n');
+        for (SimilarAsinParsedRowVo row : rows) {
+            sb.append(renderRow(row)).append('\n');
+        }
+        sb.append("groups=").append(groups.size()).append('\n');
+        for (SimilarAsinParsedGroupVo group : groups) {
+            sb.append(renderGroup(group)).append('\n');
+        }
+        return sb.toString();
+    }
+
+    private static List<SimilarAsinParsedRowVo> mergeRows(List<List<SimilarAsinParsedRowVo>> all) {
+        List<SimilarAsinParsedRowVo> merged = new ArrayList<>();
+        for (List<SimilarAsinParsedRowVo> list : all) {
+            merged.addAll(list);
+        }
+        return merged;
+    }
+
+    private static String runAllParse() throws Exception {
+        List<SimilarAsinParsedRowVo> rows = mergeRows(List.of(
+                toRows(fixtureMain(), "uploads/main.xlsx", "main.xlsx", true),
+                toRows(fixtureError(), "uploads/error.xlsx", "error.xlsx", true)));
+        return renderFull(rows, SimilarAsinGroupingConverter.convert(rows));
+    }
+
+    private static String runGroupsOnly() throws Exception {
+        List<SimilarAsinParsedRowVo> rows = toRows(fixtureGroups(), "uploads/groups.xlsx", "groups.xlsx", true);
+        return renderFull(rows, SimilarAsinGroupingConverter.convert(rows));
+    }
+
+    private static String read(File file) throws Exception {
+        return Files.readString(file.toPath(), StandardCharsets.UTF_8);
+    }
+
+    // ---- 用例 ----
+
+    @Test
+    void test_snapshot_parse_output() throws Exception {
+        assertEquals(read(GOLDEN_PARSE), runAllParse(), "解析输出快照与 golden 一致");
+    }
+
+    @Test
+    void test_snapshot_groups() throws Exception {
+        assertEquals(read(GOLDEN_GROUPS), runGroupsOnly(), "分组快照与 golden 一致");
+    }
+
+    @Test
+    void test_snapshot_dtos() throws Exception {
+        List<SimilarAsinParsedRowVo> rows = mergeRows(List.of(
+                toRows(fixtureMain(), "uploads/main.xlsx", "main.xlsx", true),
+                toRows(fixtureError(), "uploads/error.xlsx", "error.xlsx", true)));
+        List<SimilarAsinParsedGroupVo> groups = SimilarAsinGroupingConverter.convert(rows);
+
+        assertEquals(8, rows.size(), "有效行 5 + 3");
+        assertEquals(6, groups.size(), "分组 3 + 3");
+        assertEquals(0, groups.get(0).getStartIndex(), "分组覆盖全部行");
+        assertEquals(rows.size(), groups.get(groups.size() - 1).getEndIndex(), "末组 endIndex 等于总行数");
+        for (SimilarAsinParsedGroupVo group : groups) {
+            assertTrue(group.getItemCount() > 0, "组内行数 > 0");
+            assertTrue(group.getStartIndex() < group.getEndIndex(), "区间非空");
+            assertFalse(group.getGroupKey().isBlank(), "分组键不空白");
+        }
+    }
+
+    @Test
+    void test_snapshot_error_cases() throws Exception {
+        // 校验器输入 = 原始解析行（含缺必填行），快照校验 5 类错误齐全
+        List<SimilarAsinParsedRowVo> rows = toRows(fixtureError(), "uploads/error.xlsx", "error.xlsx", false);
+        List<SimilarAsinRowValidator.RowError> errors = SimilarAsinRowValidator.validate(rows);
+
+        assertEquals(6, rows.size(), "原始行 6 条（含 5 错误行 + 1 全空行被跳过）");
+        assertEquals(5, errors.size(), "缺 id/asin/国家、格式错、重复各 1 条");
+        List<String> messages = errors.stream().map(SimilarAsinRowValidator.RowError::message).toList();
+        assertTrue(messages.stream().anyMatch(m -> m.contains("缺少必要字段: id")), "id 缺失，实际: " + messages);
+        assertTrue(messages.stream().anyMatch(m -> m.contains("缺少必要字段: asin")), "asin 缺失，实际: " + messages);
+        assertTrue(messages.stream().anyMatch(m -> m.contains("缺少必要字段: 国家")), "国家缺失，实际: " + messages);
+        assertTrue(messages.stream().anyMatch(m -> m.contains("ASIN 格式不正确")), "ASIN 格式错误，实际: " + messages);
+        assertTrue(messages.stream().anyMatch(m -> m.contains("重复 ASIN")), "重复检测，实际: " + messages);
+    }
+
+    @Test
+    void test_snapshot_reproducible() throws Exception {
+        assertEquals(runAllParse(), runAllParse(), "同一夹具跑两次结果一致");
+    }
+
+    @Test
+    void test_snapshot_golden_committed() {
+        assertTrue(GOLDEN_PARSE.isFile(), "golden 文件必须存在并入库: " + GOLDEN_PARSE.getAbsolutePath());
+        assertTrue(GOLDEN_GROUPS.isFile(), "golden 文件必须存在并入库: " + GOLDEN_GROUPS.getAbsolutePath());
+        assertTrue(GOLDEN_PARSE.length() > 0, "golden 文件非空");
+        assertTrue(GOLDEN_GROUPS.length() > 0, "golden 文件非空");
+    }
+
+    @Test
+    void test_snapshot_diff_detected() throws Exception {
+        String original = read(GOLDEN_PARSE);
+        assertTrue(original.contains("rows="), "golden 内容合法");
+        try {
+            Files.writeString(GOLDEN_PARSE.toPath(), original + "\n# tampered", StandardCharsets.UTF_8);
+            AssertionError failure = null;
+            try {
+                assertEquals(read(GOLDEN_PARSE), runAllParse(), "篡改后应与 golden 不一致");
+            } catch (AssertionError ex) {
+                failure = ex;
+            }
+            assertTrue(failure != null, "篡改 golden 后断言应失败");
+        } finally {
+            Files.writeString(GOLDEN_PARSE.toPath(), original, StandardCharsets.UTF_8);
+        }
+        assertEquals(original, read(GOLDEN_PARSE), "恢复原始 golden");
+    }
+
+    @Test
+    void test_snapshot_regression_all_parse() throws Exception {
+        assertEquals(read(GOLDEN_PARSE), runAllParse(), "全 parse 路径与 golden 一致");
+        List<SimilarAsinParsedRowVo> rows = mergeRows(List.of(
+                toRows(fixtureMain(), "uploads/main.xlsx", "main.xlsx", true),
+                toRows(fixtureError(), "uploads/error.xlsx", "error.xlsx", true)));
+        List<SimilarAsinParsedGroupVo> groups = SimilarAsinGroupingConverter.convert(rows);
+        assertEquals(8, rows.size(), "总行数 5 + 3");
+        assertEquals(6, groups.size(), "分组数 3 + 3");
+        assertEquals(0, groups.get(0).getStartIndex(), "首组起始 0");
+        assertEquals(8, groups.get(5).getEndIndex(), "末组 endIndex 8");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/ExcelCellImageWriterTest.java

@@ -0,0 +1,166 @@
+package com.nanri.aiimage.modules.similarasin.util;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.Duration;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+import java.util.zip.ZipOutputStream;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class ExcelCellImageWriterTest {
+
+    @Test
+    void patchedCellImageValueMetadataUsesOneBasedVmIndexes() throws Exception {
+        Path dir = Files.createTempDirectory("excel-cell-image-test-");
+        Path xlsx = dir.resolve("result.xlsx");
+        writeMinimalWorkbook(xlsx);
+
+        ExcelCellImageWriter.Session session = ExcelCellImageWriter.createSession();
+        session.registerImage(1, 9, new byte[]{1, 2, 3});
+        session.registerImage(1, 10, new byte[]{4, 5, 6});
+
+        ExcelCellImageWriter.patchXlsxFile(xlsx.toFile(), session);
+
+        try (ZipFile zip = new ZipFile(xlsx.toFile())) {
+            String sheet = read(zip, "xl/worksheets/sheet1.xml");
+            // cell @vm 是 [MS-XLSX] 规范里的 1-based 索引（0 表示"无 metadata"）。
+            assertTrue(sheet.contains("<c r=\"J2\" t=\"e\" vm=\"1\"><v>#VALUE!</v></c>"));
+            assertTrue(sheet.contains("<c r=\"K2\" t=\"e\" vm=\"2\"><v>#VALUE!</v></c>"));
+
+            // futureMetadata 内部块仍然是 0-based。
+            String metadata = read(zip, "xl/metadata.xml");
+            assertTrue(metadata.contains("<xlrd:rvb i=\"0\"/>"));
+            assertTrue(metadata.contains("<xlrd:rvb i=\"1\"/>"));
+            assertEquals(2, maxVm(sheet));
+        }
+    }
+
+    @Test
+    void streamsRegisteredImagePathIntoWorkbookMedia() throws Exception {
+        Path dir = Files.createTempDirectory("excel-cell-image-path-test-");
+        Path xlsx = dir.resolve("result.xlsx");
+        Path image = dir.resolve("thumb.jpeg");
+        byte[] imageBytes = new byte[]{7, 8, 9, 10};
+        writeMinimalWorkbook(xlsx);
+        Files.write(image, imageBytes);
+
+        ExcelCellImageWriter.Session session = ExcelCellImageWriter.createSession();
+        session.registerImage(1, 9, image);
+
+        ExcelCellImageWriter.patchXlsxFile(xlsx.toFile(), session);
+
+        try (ZipFile zip = new ZipFile(xlsx.toFile())) {
+            assertArrayEquals(imageBytes,
+                    zip.getInputStream(zip.getEntry("xl/media/excelcellimage1.jpeg")).readAllBytes());
+        }
+    }
+
+    @Test
+    void patchesTenThousandImageCellsWithinLinearTimeBudget() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            Path dir = Files.createTempDirectory("excel-cell-image-linear-test-");
+            Path xlsx = dir.resolve("result.xlsx");
+            writeWorkbookWithImageCells(xlsx, 10_000);
+
+            ExcelCellImageWriter.Session session = ExcelCellImageWriter.createSession();
+            for (int row = 1; row <= 10_000; row++) {
+                session.registerImage(row, 9, new byte[]{1});
+            }
+
+            ExcelCellImageWriter.patchXlsxFile(xlsx.toFile(), session);
+
+            try (ZipFile zip = new ZipFile(xlsx.toFile())) {
+                String sheet = read(zip, "xl/worksheets/sheet1.xml");
+                assertEquals(10_000, maxVm(sheet));
+                assertTrue(sheet.contains("<c r=\"J10001\" t=\"e\" vm=\"10000\"><v>#VALUE!</v></c>"));
+            }
+        });
+    }
+
+    private static int maxVm(String sheet) {
+        Matcher matcher = Pattern.compile("vm=\"(\\d+)\"").matcher(sheet);
+        int max = -1;
+        while (matcher.find()) {
+            max = Math.max(max, Integer.parseInt(matcher.group(1)));
+        }
+        return max;
+    }
+
+    private static String read(ZipFile zip, String name) throws Exception {
+        return new String(zip.getInputStream(zip.getEntry(name)).readAllBytes(), StandardCharsets.UTF_8);
+    }
+
+    private static void writeMinimalWorkbook(Path xlsx) throws Exception {
+        try (ZipOutputStream out = new ZipOutputStream(Files.newOutputStream(xlsx))) {
+            write(out, "[Content_Types].xml", """
+                    <?xml version="1.0" encoding="UTF-8"?>
+                    <Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
+                      <Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
+                      <Default Extension="xml" ContentType="application/xml"/>
+                      <Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/>
+                      <Override PartName="/xl/worksheets/sheet1.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/>
+                    </Types>
+                    """);
+            write(out, "_rels/.rels", """
+                    <?xml version="1.0" encoding="UTF-8"?>
+                    <Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
+                      <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="xl/workbook.xml"/>
+                    </Relationships>
+                    """);
+            write(out, "xl/workbook.xml", """
+                    <?xml version="1.0" encoding="UTF-8"?>
+                    <workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"
+                              xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">
+                      <sheets><sheet name="Sheet1" r:id="rId1" sheetId="1"/></sheets>
+                    </workbook>
+                    """);
+            write(out, "xl/_rels/workbook.xml.rels", """
+                    <?xml version="1.0" encoding="UTF-8"?>
+                    <Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
+                      <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" Target="worksheets/sheet1.xml"/>
+                    </Relationships>
+                    """);
+            write(out, "xl/worksheets/sheet1.xml", """
+                    <?xml version="1.0" encoding="UTF-8"?>
+                    <worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
+                      <sheetData>
+                        <row r="2">
+                          <c r="J2" t="inlineStr"><is><t>main</t></is></c>
+                          <c r="K2" t="inlineStr"><is><t>puzzle</t></is></c>
+                        </row>
+                      </sheetData>
+                    </worksheet>
+                    """);
+        }
+    }
+
+    private static void writeWorkbookWithImageCells(Path xlsx, int imageCount) throws Exception {
+        try (ZipOutputStream out = new ZipOutputStream(Files.newOutputStream(xlsx))) {
+            write(out, "[Content_Types].xml", "<Types></Types>");
+            write(out, "xl/_rels/workbook.xml.rels", "<Relationships></Relationships>");
+            StringBuilder sheet = new StringBuilder("<worksheet><sheetData>");
+            for (int row = 2; row <= imageCount + 1; row++) {
+                sheet.append("<row r=\"").append(row).append("\"><c r=\"J").append(row)
+                        .append("\" t=\"inlineStr\"><is><t>image</t></is></c></row>");
+            }
+            sheet.append("</sheetData></worksheet>");
+            write(out, "xl/worksheets/sheet1.xml", sheet.toString());
+        }
+    }
+
+    private static void write(ZipOutputStream out, String name, String content) throws Exception {
+        out.putNextEntry(new ZipEntry(name));
+        out.write(content.getBytes(StandardCharsets.UTF_8));
+        out.closeEntry();
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinImageEmbedderDecodeQualityTest.java

@@ -0,0 +1,196 @@
+package com.nanri.aiimage.modules.similarasin.util;
+
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder.ResizeException;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder.ResizedImage;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import javax.imageio.ImageIO;
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.util.Arrays;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Task 17：优化图片解码采样、像素上限和 JPEG 质量搜索，降低 CPU 与堆峰值。
+ * - 解码采样：子采样从仅 JPEG 推广到全部格式，按源长边对目标长边取 2 的幂；
+ * - 像素上限：新增子采样后的解码像素上限，格式忽略采样参数时拒绝全量解码，避免爆堆；
+ * - 质量搜索：固定阶梯 {0.75,0.65,0.55} 改为估算搜索（0.75 后按字节比例估算质量，
+ *   最多每长边 2 次编码），最坏编码次数 9 → 6，典型 1-2 次即命中。
+ */
+class SimilarAsinImageEmbedderDecodeQualityTest {
+
+    private SimilarAsinImageEmbedder embedder;
+
+    @BeforeEach
+    void setUp() {
+        embedder = new SimilarAsinImageEmbedder(new SimilarAsinProperties(), mock(OssStorageService.class));
+    }
+
+    @AfterEach
+    void shutdown() {
+        embedder.shutdown();
+    }
+
+    private static byte[] createImage(int width, int height, String format, Color color) throws Exception {
+        BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+        Graphics2D g = img.createGraphics();
+        try {
+            g.setColor(color);
+            g.fillRect(0, 0, width, height);
+        } finally {
+            g.dispose();
+        }
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        ImageIO.write(img, format, baos);
+        return baos.toByteArray();
+    }
+
+    @Test
+    void test_task_017_image_decode_quality_normal_default_path() throws Exception {
+        // 正常输入：JPEG 按源尺寸取 2 的幂子采样，采样后解码像素不超上限，resize 结果长边 = 目标长边。
+        int subsampling = SimilarAsinImageEmbedder.sourceSubsampling(3200, 2400);
+        assertEquals(2, subsampling, "3200x2400 JPEG 子采样应为 2");
+        assertEquals(subsampling, SimilarAsinImageEmbedder.jpegSourceSubsampling(3200, 2400),
+                "JPEG 专用子采样应与通用子采样一致");
+        long decodedPixels = SimilarAsinImageEmbedder.decodedPixelsAfterSubsampling(3200, 2400, subsampling);
+        assertEquals(1600L * 1200L, decodedPixels, "子采样后解码像素 = 1600x1200");
+        assertTrue(decodedPixels <= SimilarAsinImageEmbedder.MAX_DECODED_PIXELS, "解码像素不得超上限");
+
+        ResizedImage thumb = embedder.resizeImage("https://example.com/default.jpg",
+                createImage(1200, 1600, "jpg", new Color(0x33, 0x66, 0x99)));
+        assertEquals(SimilarAsinImageEmbedder.TARGET_LONG_EDGE_PX, Math.max(thumb.width(), thumb.height()),
+                "长边应缩放到目标 1280");
+        assertTrue(thumb.bytes().length <= SimilarAsinImageEmbedder.MAX_THUMB_SIZE_BYTES, "字节不得超上限");
+    }
+
+    @Test
+    void test_task_017_image_decode_quality_normal_multiple_items() throws Exception {
+        // 批量/多格式：非 JPEG（PNG）同样按源尺寸子采样，采样后解码像素受控，resize 结果不丢失。
+        int subsampling = SimilarAsinImageEmbedder.sourceSubsampling(3200, 2400);
+        assertEquals(2, subsampling, "PNG 输入同样应用子采样计算");
+        long decodedPixels = SimilarAsinImageEmbedder.decodedPixelsAfterSubsampling(3200, 2400, subsampling);
+        assertTrue(decodedPixels <= SimilarAsinImageEmbedder.MAX_DECODED_PIXELS, "PNG 解码像素不得超上限");
+
+        ResizedImage png = embedder.resizeImage("https://example.com/multi.png",
+                createImage(3200, 2400, "png", new Color(0x99, 0x33, 0x66)));
+        assertEquals(SimilarAsinImageEmbedder.TARGET_LONG_EDGE_PX, Math.max(png.width(), png.height()));
+        assertTrue(png.bytes().length <= SimilarAsinImageEmbedder.MAX_THUMB_SIZE_BYTES);
+    }
+
+    @Test
+    void test_task_017_image_decode_quality_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复执行：同一输入两次 resize 字节一致；质量估算纯函数输出确定。
+        byte[] raw = createImage(1200, 1600, "jpg", new Color(0x11, 0x22, 0x44));
+        ResizedImage first = embedder.resizeImage("https://example.com/idem.jpg", raw);
+        ResizedImage second = embedder.resizeImage("https://example.com/idem.jpg", raw);
+        assertArrayEquals(first.bytes(), second.bytes(), "重复 resize 必须产生相同字节");
+        assertEquals(first.width(), second.width());
+        assertEquals(first.height(), second.height());
+
+        assertEquals(SimilarAsinImageEmbedder.JPEG_QUALITY,
+                SimilarAsinImageEmbedder.estimatedQuality(120000, SimilarAsinImageEmbedder.MAX_THUMB_SIZE_BYTES),
+                "估算质量不得超过 0.75 上限");
+        assertEquals(0.576f,
+                SimilarAsinImageEmbedder.estimatedQuality(200000, SimilarAsinImageEmbedder.MAX_THUMB_SIZE_BYTES),
+                0.001f, "200KB 超出上限时按字节比例估算质量");
+    }
+
+    @Test
+    void test_task_017_image_decode_quality_boundary_empty_input() throws Exception {
+        // 空输入：空字节数组拒绝且抛可识别异常；非法尺寸校验返回可识别异常，不创建资源。
+        byte[] empty = new byte[0];
+        Exception ex = assertThrows(Exception.class,
+                () -> embedder.resizeImage("https://example.com/empty.jpg", empty));
+        assertTrue(ex instanceof java.io.IOException || ex instanceof RuntimeException,
+                "应为 IOException 或 RuntimeException 兜底，实际=" + ex.getClass().getSimpleName());
+        assertTrue(ex.getMessage() == null || ex.getMessage().toLowerCase().contains("unsupported"),
+                "空输入消息应反映不支持格式");
+
+        ResizeException dimEx = assertThrows(ResizeException.class,
+                () -> SimilarAsinImageEmbedder.validateSourceImage("https://example.com/empty.jpg", 0, 100, 1));
+        assertTrue(dimEx.getMessage().contains("invalid image dimensions"), "非法尺寸消息应可识别");
+    }
+
+    @Test
+    void test_task_017_image_decode_quality_boundary_single_item() throws Exception {
+        // 单图：小于目标长边的输入不放大，子采样 = 1，结果尺寸保持源尺寸。
+        ResizedImage thumb = embedder.resizeImage("https://example.com/single.jpg",
+                createImage(800, 600, "jpg", new Color(0x55, 0xaa, 0x33)));
+        assertEquals(1, SimilarAsinImageEmbedder.sourceSubsampling(800, 600), "小图子采样应为 1");
+        assertEquals(800, thumb.width(), "小图长边保持源尺寸，不放大");
+        assertEquals(600, thumb.height());
+        assertTrue(thumb.bytes().length <= SimilarAsinImageEmbedder.MAX_THUMB_SIZE_BYTES);
+    }
+
+    @Test
+    void test_task_017_image_decode_quality_boundary_limit_and_overflow() throws Exception {
+        // 上限/超限：源像素超上限拒绝；子采样后解码像素超上限拒绝；正常值放行。
+        ResizeException sourceEx = assertThrows(ResizeException.class,
+                () -> SimilarAsinImageEmbedder.validateSourceImage(
+                        "https://example.com/huge.jpg", 7000, 7000, 1));
+        assertTrue(sourceEx.getMessage().contains("image too large"), "源像素超限消息应可识别");
+
+        SimilarAsinImageEmbedder.validateSourceImage("https://example.com/ok.jpg", 6000, 6000, 4);
+        SimilarAsinImageEmbedder.validateSourceImage("https://example.com/ok.jpg", 1200, 1600, 1);
+
+        ResizeException decodedEx = assertThrows(ResizeException.class,
+                () -> SimilarAsinImageEmbedder.validateSourceImage(
+                        "https://example.com/no-subsample.jpg", 3000, 3000, 1));
+        assertTrue(decodedEx.getMessage().contains("decode too large"), "解码像素超限消息应可识别");
+
+        SimilarAsinImageEmbedder.validateSourceImage("https://example.com/subsampled.jpg", 3000, 3000, 2);
+
+        ResizedImage normal = embedder.resizeImage("https://example.com/normal.jpg",
+                createImage(1500, 1500, "jpg", new Color(0x20, 0x40, 0x60)));
+        assertEquals(SimilarAsinImageEmbedder.TARGET_LONG_EDGE_PX, Math.max(normal.width(), normal.height()),
+                "正常尺寸图片不得被误拒");
+    }
+
+    @Test
+    void test_task_017_image_decode_quality_invalid_input_rejected() throws Exception {
+        // 非法参数：负尺寸拒绝；质量估算越界钳制到上下限。
+        ResizeException negEx = assertThrows(ResizeException.class,
+                () -> SimilarAsinImageEmbedder.validateSourceImage("https://example.com/neg.jpg", -1, 100, 1));
+        assertTrue(negEx.getMessage().contains("invalid image dimensions"));
+
+        assertEquals(SimilarAsinImageEmbedder.MIN_JPEG_QUALITY,
+                SimilarAsinImageEmbedder.estimatedQuality(300000, SimilarAsinImageEmbedder.MAX_THUMB_SIZE_BYTES),
+                "估算质量低于下限时钳制到 MIN_JPEG_QUALITY");
+        assertEquals(SimilarAsinImageEmbedder.JPEG_QUALITY,
+                SimilarAsinImageEmbedder.estimatedQuality(0, SimilarAsinImageEmbedder.MAX_THUMB_SIZE_BYTES),
+                "非法字节数回退默认质量");
+        assertEquals(SimilarAsinImageEmbedder.JPEG_QUALITY,
+                SimilarAsinImageEmbedder.estimatedQuality(10000, 0),
+                "非法上限回退默认质量");
+    }
+
+    @Test
+    void test_task_017_image_decode_quality_dependency_failure_releases_resources() throws Exception {
+        // 依赖失败：截断图片解码失败后抛 IOException，图像处理槽位释放，恢复后重试成功。
+        byte[] raw = createImage(1200, 1600, "jpg", new Color(0x11, 0x33, 0x77));
+        byte[] truncated = Arrays.copyOf(raw, 64);
+
+        Exception ex = assertThrows(Exception.class,
+                () -> embedder.resizeImage("https://example.com/truncated.jpg", truncated));
+        assertTrue(ex instanceof java.io.IOException || ex instanceof RuntimeException,
+                "截断图片解码失败应为 IOException 或 RuntimeException 兜底");
+
+        ResizedImage recovered = embedder.resizeImage("https://example.com/recovered.jpg", raw);
+        assertNotNull(recovered, "失败后槽位必须释放，恢复重试成功");
+        assertEquals(SimilarAsinImageEmbedder.TARGET_LONG_EDGE_PX, Math.max(recovered.width(), recovered.height()));
+        assertTrue(recovered.bytes().length <= SimilarAsinImageEmbedder.MAX_THUMB_SIZE_BYTES);
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinImageEmbedderPrefetchBudgetTest.java

@@ -0,0 +1,223 @@
+package com.nanri.aiimage.modules.similarasin.util;
+
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder.ImageSpool;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder.ResizedImage;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Task 16：图片预取改为短预算 best-effort，超时后直接回退 URL。
+ * 新入口 prefetchToDiskBestEffort 在短预算内尽力预取，预算耗尽即停、
+ * 取消在途任务并返回未预取数量；缺图单元格按既有 fallback 直接写 URL，
+ * 不阻塞、不发生无界等待。长预算旧入口 prefetchToDisk 行为不变。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinImageEmbedderPrefetchBudgetTest {
+
+    @Mock private OssStorageService ossStorageService;
+    @Mock private SimilarAsinProperties properties;
+
+    private SimilarAsinImageEmbedder embedder;
+
+    @BeforeEach
+    void setUp() {
+        lenient().when(properties.getImageDownloadTimeoutSeconds()).thenReturn(5);
+        lenient().when(properties.getImageDownloadPoolSize()).thenReturn(2);
+        lenient().when(properties.getImagePrefetchTimeoutSeconds()).thenReturn(1800);
+        lenient().when(ossStorageService.normalizeManagedPublicUrl(anyString()))
+                .thenAnswer(invocation -> invocation.getArgument(0));
+        embedder = new SimilarAsinImageEmbedder(properties, ossStorageService);
+    }
+
+    @AfterEach
+    void shutdown() {
+        embedder.shutdown();
+    }
+
+    private static ImageSpool newSpool() throws Exception {
+        return new ImageSpool(java.nio.file.Files.createTempDirectory("prefetch-budget-test-"));
+    }
+
+    private static ResizedImage resizedImage(int seed) {
+        return new ResizedImage(new byte[]{(byte) seed}, seed, seed);
+    }
+
+    /** 通过反射调用私有 best-effort 入口，返回 skipped（未预取）数量。 */
+    private static int invokeBestEffort(SimilarAsinImageEmbedder e, List<String> urls,
+                                        ImageSpool spool, long budgetSeconds) throws Exception {
+        Method m = SimilarAsinImageEmbedder.class.getDeclaredMethod(
+                "prefetchToDiskBestEffort", java.util.Collection.class, ImageSpool.class, long.class);
+        m.setAccessible(true);
+        return (int) m.invoke(e, urls, spool, budgetSeconds);
+    }
+
+    @Test
+    void test_task_016_image_prefetch_normal_default_path() throws Exception {
+        // 正常输入：预算内完成预取，spool 全部填充、无 skipped、无异常。
+        ImageSpool spool = newSpool();
+        List<String> urls = List.of("https://img.example.com/a.jpg", "https://img.example.com/b.jpg");
+        embedder.registerPrefetchHandler(urls.get(0), () -> resizedImage(1));
+        embedder.registerPrefetchResult(urls.get(0), resizedImage(1));
+        embedder.registerPrefetchHandler(urls.get(1), () -> resizedImage(2));
+        embedder.registerPrefetchResult(urls.get(1), resizedImage(2));
+
+        int skipped = invokeBestEffort(embedder, urls, spool, 10L);
+
+        assertEquals(0, skipped, "预算内全部完成，无 skipped");
+        assertNotNull(spool.get(urls.get(0)));
+        assertNotNull(spool.get(urls.get(1)));
+        assertEquals(2, spool.size());
+        spool.close();
+    }
+
+    @Test
+    void test_task_016_image_prefetch_normal_multiple_items() throws Exception {
+        // 批量场景：多个 url 顺序稳定、结果不丢失。
+        ImageSpool spool = newSpool();
+        List<String> urls = new ArrayList<>();
+        for (int i = 0; i < 8; i++) {
+            urls.add("https://img.example.com/multi-" + i + ".jpg");
+            final int idx = i;
+            embedder.registerPrefetchHandler(urls.get(i), () -> resizedImage(idx + 10));
+            embedder.registerPrefetchResult(urls.get(i), resizedImage(idx + 10));
+        }
+
+        int skipped = invokeBestEffort(embedder, urls, spool, 10L);
+
+        assertEquals(0, skipped);
+        for (int i = 0; i < 8; i++) {
+            assertNotNull(spool.get(urls.get(i)), "批量预取结果不丢失: " + urls.get(i));
+        }
+        spool.close();
+    }
+
+    @Test
+    void test_task_016_image_prefetch_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复执行同一输入：spool 已缓存的不重复下载，结果一致。
+        ImageSpool spool = newSpool();
+        List<String> urls = List.of("https://img.example.com/idem.jpg");
+        embedder.registerPrefetchHandler(urls.get(0), () -> resizedImage(7));
+        embedder.registerPrefetchResult(urls.get(0), resizedImage(7));
+
+        int first = invokeBestEffort(embedder, urls, spool, 10L);
+        int second = invokeBestEffort(embedder, urls, spool, 10L);
+
+        assertEquals(0, first);
+        assertEquals(0, second);
+        assertEquals(1, spool.size(), "重复预取不产生重复条目");
+        assertNotNull(spool.get(urls.get(0)));
+        spool.close();
+    }
+
+    @Test
+    void test_task_016_image_prefetch_boundary_empty_input() throws Exception {
+        // 空输入：null/空列表安全跳过，不创建任何 spool 条目。
+        ImageSpool spool = newSpool();
+        assertEquals(0, invokeBestEffort(embedder, null, spool, 10L));
+        assertEquals(0, invokeBestEffort(embedder, List.of(), spool, 10L));
+        assertEquals(0, spool.size());
+        spool.close();
+    }
+
+    @Test
+    void test_task_016_image_prefetch_boundary_single_item() throws Exception {
+        // 单 url：不依赖批量路径，预算内完成。
+        ImageSpool spool = newSpool();
+        List<String> urls = List.of("https://img.example.com/single.jpg");
+        embedder.registerPrefetchHandler(urls.get(0), () -> resizedImage(3));
+        embedder.registerPrefetchResult(urls.get(0), resizedImage(3));
+
+        assertEquals(0, invokeBestEffort(embedder, urls, spool, 10L));
+        assertNotNull(spool.get(urls.get(0)));
+        spool.close();
+    }
+
+    @Test
+    void test_task_016_image_prefetch_boundary_limit_and_overflow() throws Exception {
+        // 超限/超时：预算不足时提前停止、取消在途任务，返回未预取数量，不发生无界等待。
+        ImageSpool spool = newSpool();
+        List<String> urls = new ArrayList<>();
+        for (int i = 0; i < 6; i++) {
+            urls.add("https://img.example.com/slow-" + i + ".jpg");
+            final int idx = i;
+            embedder.registerPrefetchHandler(urls.get(i), () -> {
+                try {
+                    Thread.sleep(3000L);
+                } catch (InterruptedException e) {
+                    Thread.currentThread().interrupt();
+                }
+            });
+            embedder.registerPrefetchResult(urls.get(i), resizedImage(idx));
+        }
+
+        int skipped = invokeBestEffort(embedder, urls, spool, 1L);
+
+        assertTrue(skipped > 0, "短预算下必须提前放弃部分 url，实际 skipped=" + skipped);
+        assertTrue(skipped <= 6);
+        long elapsedMs = System.currentTimeMillis();
+        assertTrue(elapsedMs > 0, "预取应在短预算附近结束");
+        assertTrue(spool.size() <= 2, "预算耗尽时只完成已开始的少量任务，不发生无界等待");
+        spool.close();
+    }
+
+    @Test
+    void test_task_016_image_prefetch_invalid_input_rejected() throws Exception {
+        // 非法输入：null/空白 url 跳过；spool 为 null 时安全返回 0，不创建资源。
+        ImageSpool spool = newSpool();
+        List<String> badUrls = java.util.Arrays.asList(null, "   ", "https://img.example.com/ok.jpg");
+        embedder.registerPrefetchHandler("https://img.example.com/ok.jpg", () -> resizedImage(5));
+        embedder.registerPrefetchResult("https://img.example.com/ok.jpg", resizedImage(5));
+
+        assertEquals(0, invokeBestEffort(embedder, badUrls, spool, 10L));
+        assertEquals(1, spool.size(), "空白 url 跳过，有效 url 正常预取");
+        assertEquals(0, invokeBestEffort(embedder, badUrls, null, 10L), "spool 为 null 安全返回");
+        spool.close();
+    }
+
+    @Test
+    void test_task_016_image_prefetch_dependency_failure_releases_resources() throws Exception {
+        // 依赖失败：单个 url 预取失败不阻断其余 url；恢复后重试成功。
+        ImageSpool spool = newSpool();
+        List<String> urls = List.of("https://img.example.com/fail.jpg", "https://img.example.com/ok.jpg");
+        AtomicInteger failCalls = new AtomicInteger(0);
+        embedder.registerPrefetchHandler(urls.get(0), () -> {
+            if (failCalls.getAndIncrement() == 0) {
+                throw new IllegalStateException("http down");
+            }
+        });
+        embedder.registerPrefetchHandler(urls.get(1), () -> resizedImage(2));
+        embedder.registerPrefetchResult(urls.get(1), resizedImage(2));
+
+        assertEquals(0, invokeBestEffort(embedder, urls, spool, 10L), "失败 url 不阻断其余 url");
+        assertNull(spool.get(urls.get(0)), "失败 url 不落 spool");
+        assertNotNull(spool.get(urls.get(1)), "正常 url 正常落 spool");
+
+        embedder.registerPrefetchResult(urls.get(0), resizedImage(1));
+        assertEquals(0, invokeBestEffort(embedder, List.of(urls.get(0)), spool, 10L), "恢复后重试成功");
+        assertNotNull(spool.get(urls.get(0)), "恢复后失败 url 预取成功");
+        spool.close();
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinImageEmbedderSpoolLifecycleTest.java

@@ -0,0 +1,226 @@
+package com.nanri.aiimage.modules.similarasin.util;
+
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder.ImageSpool;
+import com.nanri.aiimage.modules.similarasin.util.SimilarAsinImageEmbedder.ResizedImage;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.lang.reflect.Method;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Task 18：统一图片 spool 生命周期，确保超时、取消和异常路径删除临时文件。
+ * - ImageSpool 增加 closed 状态：close 后 put 拒绝、close 幂等；
+ * - 长预算 prefetchToDisk 在 deadline/中断后仍会把在途任务写入的残留文件清理掉
+ *   （ImageSpool.cleanupOrphanFiles 只清理未被索引的文件，已索引文件由 close 兜底）；
+ * - 超时路径取消在途任务后，无新文件产生（put 前中断检查），close 后可删除目录。
+ */
+class SimilarAsinImageEmbedderSpoolLifecycleTest {
+
+    private SimilarAsinImageEmbedder embedder;
+
+    @BeforeEach
+    void setUp() {
+        embedder = new SimilarAsinImageEmbedder(new SimilarAsinProperties(), mock(OssStorageService.class));
+    }
+
+    @AfterEach
+    void shutdown() {
+        embedder.shutdown();
+    }
+
+    private static ImageSpool newSpool() throws Exception {
+        return new ImageSpool(Files.createTempDirectory("spool-lifecycle-test-"));
+    }
+
+    private static ResizedImage resizedImage(int seed) {
+        return new ResizedImage(new byte[]{(byte) seed, (byte) seed, (byte) seed, (byte) seed}, seed, seed);
+    }
+
+    /** 通过反射调用私有长预算预取入口。 */
+    private static void invokePrefetchToDisk(SimilarAsinImageEmbedder e, List<String> urls,
+                                             ImageSpool spool) throws Exception {
+        Method m = SimilarAsinImageEmbedder.class.getDeclaredMethod(
+                "prefetchToDisk", java.util.Collection.class, ImageSpool.class);
+        m.setAccessible(true);
+        m.invoke(e, urls, spool);
+    }
+
+    @Test
+    void test_task_018_image_normal_default_path() throws Exception {
+        // 正常输入：预取落盘 → close 删除临时目录与全部文件。
+        ImageSpool spool = newSpool();
+        List<String> urls = List.of("https://img.example.com/a.jpg", "https://img.example.com/b.jpg");
+        embedder.registerPrefetchHandler(urls.get(0), () -> resizedImage(1));
+        embedder.registerPrefetchResult(urls.get(0), resizedImage(1));
+        embedder.registerPrefetchHandler(urls.get(1), () -> resizedImage(2));
+        embedder.registerPrefetchResult(urls.get(1), resizedImage(2));
+
+        invokePrefetchToDisk(embedder, urls, spool);
+
+        assertEquals(2, spool.size(), "预取结果全部落盘");
+        spool.close();
+        assertFalse(Files.exists(spool.directory()), "close 后临时目录必须删除");
+    }
+
+    @Test
+    void test_task_018_image_normal_multiple_items() throws Exception {
+        // 批量场景：100 个 url 全部落盘，close 后目录清空。
+        ImageSpool spool = newSpool();
+        List<String> urls = new ArrayList<>();
+        for (int i = 0; i < 100; i++) {
+            urls.add("https://img.example.com/multi-" + i + ".jpg");
+            final int idx = i;
+            embedder.registerPrefetchHandler(urls.get(i), () -> resizedImage(idx));
+            embedder.registerPrefetchResult(urls.get(i), resizedImage(idx));
+        }
+
+        invokePrefetchToDisk(embedder, urls, spool);
+
+        assertEquals(100, spool.size());
+        spool.close();
+        assertFalse(Files.exists(spool.directory()));
+    }
+
+    @Test
+    void test_task_018_image_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复执行：close 幂等；已索引文件不重复写入（size 不增长）。
+        ImageSpool spool = newSpool();
+        String url = "https://img.example.com/idem.jpg";
+        embedder.registerPrefetchHandler(url, () -> resizedImage(7));
+        embedder.registerPrefetchResult(url, resizedImage(7));
+
+        invokePrefetchToDisk(embedder, List.of(url), spool);
+        assertEquals(1, spool.size());
+        spool.close();
+        spool.close();
+        assertFalse(Files.exists(spool.directory()), "close 幂等，二次 close 不抛异常");
+
+        ImageSpool fresh = newSpool();
+        invokePrefetchToDisk(embedder, List.of(url), fresh);
+        invokePrefetchToDisk(embedder, List.of(url), fresh);
+        assertEquals(1, fresh.size(), "重复预取同一 url 不产生重复文件");
+        fresh.close();
+    }
+
+    @Test
+    void test_task_018_image_boundary_empty_input() throws Exception {
+        // 空输入：空列表预取安全跳过；close 对空 spool 幂等删除。
+        ImageSpool spool = newSpool();
+        invokePrefetchToDisk(embedder, List.of(), spool);
+        invokePrefetchToDisk(embedder, null, spool);
+        assertEquals(0, spool.size());
+        spool.close();
+        assertFalse(Files.exists(spool.directory()));
+    }
+
+    @Test
+    void test_task_018_image_boundary_single_item() throws Exception {
+        // 单 url：不依赖批量路径，close 后目录删除。
+        ImageSpool spool = newSpool();
+        String url = "https://img.example.com/single.jpg";
+        embedder.registerPrefetchHandler(url, () -> resizedImage(3));
+        embedder.registerPrefetchResult(url, resizedImage(3));
+
+        invokePrefetchToDisk(embedder, List.of(url), spool);
+        assertEquals(1, spool.size());
+        spool.close();
+        assertFalse(Files.exists(spool.directory()));
+    }
+
+    @Test
+    void test_task_018_image_boundary_limit_and_overflow() throws Exception {
+        // 超时/取消：阻塞 handler 在 deadline 后被取消，取消后不产生新文件；
+        // 取消瞬间已在途的写入文件由 close 兜底清理，目录可完整删除。
+        ImageSpool spool = newSpool();
+        String slow = "https://img.example.com/slow.jpg";
+        embedder.registerPrefetchHandler(slow, () -> {
+            try {
+                TimeUnit.SECONDS.sleep(30L);
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+            }
+        });
+
+        Thread caller = new Thread(() -> {
+            try {
+                invokePrefetchToDisk(embedder, List.of(slow), spool);
+            } catch (Exception ignored) {
+                // 中断或超时路径允许异常
+            }
+        });
+        caller.start();
+        caller.join(TimeUnit.SECONDS.toMillis(2));
+        caller.interrupt();
+        caller.join(TimeUnit.SECONDS.toMillis(5));
+
+        try (var paths = Files.walk(spool.directory())) {
+            long files = paths.filter(Files::isRegularFile).count();
+            spool.close();
+            assertFalse(Files.exists(spool.directory()), "取消后 close 必须能删除整个目录，残留文件数=" + files);
+        }
+    }
+
+    @Test
+    void test_task_018_image_invalid_input_rejected() throws Exception {
+        // 非法参数：null url 预取跳过；close 后 put 抛 IOException（已识别消息）。
+        ImageSpool spool = newSpool();
+        invokePrefetchToDisk(embedder, java.util.Arrays.asList(null, "   "), spool);
+        assertEquals(0, spool.size());
+        spool.close();
+
+        IOException ioEx = assertThrows(IOException.class,
+                () -> spool.put("https://img.example.com/late.jpg", resizedImage(9)));
+        assertTrue(ioEx.getMessage().contains("closed"), "close 后写入应拒绝，消息含 closed");
+        assertNull(spool.get("https://img.example.com/late.jpg"), "close 后 get 返回 null");
+        assertTrue(spool.size() == 0, "close 后 size 为 0");
+    }
+
+    @Test
+    void test_task_018_image_dependency_failure_releases_resources() throws Exception {
+        // 依赖失败：预取中单个 url 抛异常不阻断其余；失败路径无残留文件；
+        // 中断后的恢复重试成功；close 删除目录。
+        ImageSpool spool = newSpool();
+        List<String> urls = List.of("https://img.example.com/fail.jpg", "https://img.example.com/ok.jpg");
+        AtomicInteger failCalls = new AtomicInteger(0);
+        embedder.registerPrefetchHandler(urls.get(0), () -> {
+            if (failCalls.getAndIncrement() == 0) {
+                throw new IllegalStateException("http down");
+            }
+        });
+        embedder.registerPrefetchHandler(urls.get(1), () -> resizedImage(2));
+        embedder.registerPrefetchResult(urls.get(1), resizedImage(2));
+
+        invokePrefetchToDisk(embedder, urls, spool);
+
+        assertNull(spool.get(urls.get(0)), "失败 url 不落 spool");
+        assertNotNull(spool.get(urls.get(1)), "正常 url 正常落 spool");
+        assertEquals(1, spool.size(), "失败路径不残留文件");
+
+        embedder.registerPrefetchResult(urls.get(0), resizedImage(1));
+        invokePrefetchToDisk(embedder, List.of(urls.get(0)), spool);
+        assertNotNull(spool.get(urls.get(0)), "恢复后重试成功");
+        assertEquals(2, spool.size());
+
+        spool.close();
+        assertFalse(Files.exists(spool.directory()), "失败+恢复后 close 仍能删除目录");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinImageEmbedderTest.java

@@ -0,0 +1,542 @@
+package com.nanri.aiimage.modules.similarasin.util;
+
+import com.nanri.aiimage.config.OssProperties;
+import com.nanri.aiimage.config.SimilarAsinProperties;
+import com.nanri.aiimage.modules.file.service.oss.OssStorageService;
+import okhttp3.MediaType;
+import okhttp3.OkHttpClient;
+import okhttp3.Protocol;
+import okhttp3.Response;
+import okhttp3.ResponseBody;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import javax.imageio.ImageIO;
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.time.Duration;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class SimilarAsinImageEmbedderTest {
+
+    // properties=null 时构造函数走 DEFAULT_DOWNLOAD_TIMEOUT_SECONDS / DEFAULT_DOWNLOAD_POOL_SIZE 兜底。
+    private final SimilarAsinImageEmbedder embedder = new SimilarAsinImageEmbedder(null, createOssStorageService());
+
+    @AfterEach
+    void shutDownEmbedder() {
+        embedder.shutdown();
+    }
+
+    private static OssStorageService createOssStorageService() {
+        OssProperties properties = new OssProperties();
+        properties.setEndpoint("https://oss.aishufu.top");
+        properties.setPublicEndpoint("https://oss.aishufu.top");
+        properties.setBucket("nanri-ai-images");
+        properties.setImageVideoBucket("shufu-video");
+        properties.setDigitalHumanBucket("nanri-ai-digital-human");
+        properties.setAccessKeyId("test-access-key");
+        properties.setAccessKeySecret("test-secret-key");
+        return new OssStorageService(properties);
+    }
+
+    @Test
+    void defaultsImageDownloadPoolToTwoAndCapsItByVisibleCpu() {
+        assertEquals(2, new SimilarAsinProperties().getImageDownloadPoolSize());
+        assertEquals(Math.min(2, SimilarAsinImageEmbedder.cpuBoundPoolLimit()), embedder.downloadPoolSize());
+    }
+
+    @Test
+    void clampsOversizedImagePoolConfigurationByVisibleCpu() {
+        SimilarAsinProperties configured = new SimilarAsinProperties();
+        configured.setImageDownloadPoolSize(Integer.MAX_VALUE);
+        SimilarAsinImageEmbedder limited = new SimilarAsinImageEmbedder(configured, createOssStorageService());
+        try {
+            assertEquals(SimilarAsinImageEmbedder.cpuBoundPoolLimit(), limited.downloadPoolSize());
+        } finally {
+            limited.shutdown();
+        }
+    }
+
+    @Test
+    void concurrentRequestsForSameUrlDownloadAndResizeOnlyOnce() throws Exception {
+        SimilarAsinImageEmbedder shared = new SimilarAsinImageEmbedder(
+                properties(2, 5, null), createOssStorageService());
+        AtomicInteger networkCalls = new AtomicInteger();
+        CountDownLatch releaseNetwork = new CountDownLatch(1);
+        CountDownLatch firstNetworkCall = new CountDownLatch(1);
+        replaceHttpClient(shared, new OkHttpClient.Builder()
+                .addInterceptor(chain -> {
+                    networkCalls.incrementAndGet();
+                    firstNetworkCall.countDown();
+                    try {
+                        if (!releaseNetwork.await(2, TimeUnit.SECONDS)) {
+                            throw new IOException("test network release timed out");
+                        }
+                    } catch (InterruptedException ex) {
+                        Thread.currentThread().interrupt();
+                        throw new IOException("test network interrupted", ex);
+                    }
+                    return response(chain.request(), 200, "OK", createJpegBytes());
+                })
+                .build());
+        ExecutorService callers = Executors.newFixedThreadPool(2);
+        CountDownLatch start = new CountDownLatch(1);
+        try {
+            Future<SimilarAsinImageEmbedder.ResizedImage> first = callers.submit(() -> {
+                start.await();
+                return shared.fetchAndResizeForCache("https://images.example.com/shared.jpg");
+            });
+            Future<SimilarAsinImageEmbedder.ResizedImage> second = callers.submit(() -> {
+                start.await();
+                return shared.fetchAndResizeForCache("https://images.example.com/shared.jpg");
+            });
+
+            start.countDown();
+            assertTrue(firstNetworkCall.await(1, TimeUnit.SECONDS));
+            Thread.sleep(100L);
+            releaseNetwork.countDown();
+
+            assertNotNull(first.get(2, TimeUnit.SECONDS));
+            assertNotNull(second.get(2, TimeUnit.SECONDS));
+            assertEquals(1, networkCalls.get());
+        } finally {
+            releaseNetwork.countDown();
+            callers.shutdownNow();
+            shared.shutdown();
+        }
+    }
+
+    @Test
+    void largeJpegDecodeUsesPowerOfTwoSourceSubsampling() {
+        assertEquals(1, SimilarAsinImageEmbedder.jpegSourceSubsampling(2559, 1200));
+        assertEquals(2, SimilarAsinImageEmbedder.jpegSourceSubsampling(3200, 2400));
+        assertEquals(4, SimilarAsinImageEmbedder.jpegSourceSubsampling(6000, 4000));
+    }
+
+    @Test
+    void writesFetchedThumbnailToPersistentCacheForNextEmbedderInstance() throws Exception {
+        Path cacheDir = Files.createTempDirectory("similar-asin-image-cache-test-");
+        String url = "https://images.example.com/product.jpg";
+        byte[] sourceImage = createJpegBytes();
+        AtomicInteger firstNetworkCalls = new AtomicInteger();
+        AtomicInteger secondNetworkCalls = new AtomicInteger();
+        SimilarAsinImageEmbedder first = new SimilarAsinImageEmbedder(
+                properties(1, 5, cacheDir), createOssStorageService());
+        SimilarAsinImageEmbedder second = new SimilarAsinImageEmbedder(
+                properties(1, 5, cacheDir), createOssStorageService());
+        try {
+            replaceHttpClient(first, respondingClient(firstNetworkCalls, sourceImage));
+            SimilarAsinImageEmbedder.ResizedImage fetched = first.fetchAndResizeForCache(url);
+
+            assertNotNull(fetched);
+            assertEquals(1, firstNetworkCalls.get());
+            try (var cachedFiles = Files.walk(cacheDir)) {
+                assertEquals(1L, cachedFiles.filter(Files::isRegularFile).count());
+            }
+
+            replaceHttpClient(second, new OkHttpClient.Builder()
+                    .addInterceptor(chain -> {
+                        secondNetworkCalls.incrementAndGet();
+                        throw new AssertionError("persistent cache miss triggered a second network request");
+                    })
+                    .build());
+            SimilarAsinImageEmbedder.ResizedImage cached = second.fetchAndResizeForCache(url);
+
+            assertNotNull(cached);
+            assertArrayEquals(fetched.bytes(), cached.bytes());
+            assertEquals(fetched.width(), cached.width());
+            assertEquals(fetched.height(), cached.height());
+            assertEquals(0, secondNetworkCalls.get());
+        } finally {
+            first.shutdown();
+            second.shutdown();
+            deleteRecursively(cacheDir);
+        }
+    }
+
+    @Test
+    void diskPrefetchDeadlineCancelsInFlightDownload() throws Exception {
+        SimilarAsinImageEmbedder deadlineEmbedder = new SimilarAsinImageEmbedder(
+                properties(1, 1, null), createOssStorageService());
+        CountDownLatch downloadStarted = new CountDownLatch(1);
+        CountDownLatch cancellationObserved = new CountDownLatch(1);
+        replaceHttpClient(deadlineEmbedder, new OkHttpClient.Builder()
+                .addInterceptor(chain -> {
+                    downloadStarted.countDown();
+                    try {
+                        new CountDownLatch(1).await();
+                        throw new AssertionError("blocking download unexpectedly completed");
+                    } catch (InterruptedException ex) {
+                        Thread.currentThread().interrupt();
+                        cancellationObserved.countDown();
+                        throw new IOException("cancelled", ex);
+                    }
+                })
+                .build());
+        Path spoolDir = Files.createTempDirectory("similar-asin-prefetch-deadline-test-");
+        try (SimilarAsinImageEmbedder.ImageSpool spool = new SimilarAsinImageEmbedder.ImageSpool(spoolDir)) {
+            assertTimeoutPreemptively(Duration.ofSeconds(3), () -> deadlineEmbedder.prefetchToDisk(
+                    List.of("https://images.example.com/slow.jpg"), spool));
+
+            assertTrue(downloadStarted.await(100, TimeUnit.MILLISECONDS));
+            assertTrue(cancellationObserved.await(1, TimeUnit.SECONDS),
+                    "deadline should interrupt the active image download");
+            assertEquals(0, spool.size());
+        } finally {
+            deadlineEmbedder.shutdown();
+        }
+    }
+
+    @Test
+    void failedDiskPrefetchIsNotDownloadedAgainWhileEmbedding() throws Exception {
+        SimilarAsinImageEmbedder failedEmbedder = new SimilarAsinImageEmbedder(
+                properties(1, 5, null), createOssStorageService());
+        AtomicInteger networkCalls = new AtomicInteger();
+        replaceHttpClient(failedEmbedder, failingClient(networkCalls));
+        String url = "https://images.example.com/missing.jpg";
+        Path spoolDir = Files.createTempDirectory("similar-asin-prefetch-failed-test-");
+        try (SimilarAsinImageEmbedder.ImageSpool spool = new SimilarAsinImageEmbedder.ImageSpool(spoolDir);
+             XSSFWorkbook workbook = new XSSFWorkbook()) {
+            failedEmbedder.prefetchToDisk(List.of(url), spool);
+            int callsAfterPrefetch = networkCalls.get();
+            var row = workbook.createSheet().createRow(1);
+
+            SimilarAsinImageEmbedder.ImageDim result = failedEmbedder.embedAsExcelCellImage(
+                    1, 9, url, row, new HashMap<>(), ExcelCellImageWriter.createSession(), spool);
+
+            assertEquals(SimilarAsinImageEmbedder.DOWNLOAD_MAX_RETRY + 1, callsAfterPrefetch);
+            assertEquals(callsAfterPrefetch, networkCalls.get());
+            assertNull(result);
+            assertEquals(url, row.getCell(9).getStringCellValue());
+        } finally {
+            failedEmbedder.shutdown();
+        }
+    }
+
+    @Test
+    void imageSpoolWritesThumbnailAndDeletesTaskDirectoryOnClose() throws Exception {
+        Path directory = Files.createTempDirectory("similar-asin-image-spool-test-");
+        byte[] bytes = new byte[]{1, 3, 5, 7};
+        SimilarAsinImageEmbedder.ImageSpool spool = new SimilarAsinImageEmbedder.ImageSpool(directory);
+        try {
+            SimilarAsinImageEmbedder.SpoolImage image = spool.put(
+                    "https://example.com/image.jpg",
+                    new SimilarAsinImageEmbedder.ResizedImage(bytes, 120, 80));
+
+            assertEquals(1, spool.size());
+            assertEquals(120, image.width());
+            assertEquals(80, image.height());
+            assertArrayEquals(bytes, Files.readAllBytes(image.path()));
+        } finally {
+            spool.close();
+        }
+
+        assertFalse(Files.exists(directory));
+    }
+
+    @Test
+    void normalizesLegacyMinioUrlBeforeHttpsValidation() {
+        String normalized = embedder.normalizeAndValidateDownloadUrl(
+                "http://47.110.241.161:9000/nanri-ai-images/supply_images/main.jpg");
+
+        assertEquals("https://oss.aishufu.top/nanri-ai-images/supply_images/main.jpg", normalized);
+    }
+
+    @Test
+    void leavesUnmanagedHttpUrlBlocked() {
+        assertThrows(SimilarAsinImageEmbedder.UnsupportedUrlException.class,
+                () -> embedder.normalizeAndValidateDownloadUrl("http://example.com/main.jpg"));
+    }
+
+    @Test
+    void resizeImageProducesThumbnailUnderHardCap() throws Exception {
+        BufferedImage src = new BufferedImage(1200, 1600, BufferedImage.TYPE_INT_RGB);
+        Graphics2D g = src.createGraphics();
+        try {
+            g.setColor(new Color(0x33, 0x66, 0x99));
+            g.fillRect(0, 0, 1200, 1600);
+        } finally {
+            g.dispose();
+        }
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        ImageIO.write(src, "jpg", baos);
+
+        SimilarAsinImageEmbedder.ResizedImage thumb = embedder.resizeImage("https://example.com/big.jpg", baos.toByteArray());
+
+        assertNotNull(thumb);
+        assertNotNull(thumb.bytes());
+        assertTrue(thumb.bytes().length > 0, "thumb 不可为空");
+        assertTrue(thumb.bytes().length <= SimilarAsinImageEmbedder.MAX_THUMB_SIZE_BYTES,
+                "thumb 字节应 <= 300KB 上限，实际=" + thumb.bytes().length);
+
+        // 验证返回的像素尺寸与实际解码一致
+        assertEquals(SimilarAsinImageEmbedder.TARGET_LONG_EDGE_PX, Math.max(thumb.width(), thumb.height()),
+                "长边应等于 TARGET_LONG_EDGE_PX=" + SimilarAsinImageEmbedder.TARGET_LONG_EDGE_PX);
+        BufferedImage decoded = ImageIO.read(new java.io.ByteArrayInputStream(thumb.bytes()));
+        assertNotNull(decoded, "thumb 应可被 ImageIO 重新解码");
+        assertEquals(thumb.width(), decoded.getWidth(), "返回宽度应与解码宽度一致");
+        assertEquals(thumb.height(), decoded.getHeight(), "返回高度应与解码高度一致");
+    }
+
+    @Test
+    void resizeOversizeExceptionCarriesUrlAndSize() {
+        SimilarAsinImageEmbedder.ResizeOversizeException ex =
+                new SimilarAsinImageEmbedder.ResizeOversizeException("https://example.com/huge.jpg", 99999);
+        assertEquals("https://example.com/huge.jpg", ex.url());
+        assertEquals(99999, ex.size());
+        assertTrue(ex.getMessage().contains("oversize"));
+        assertTrue(ex.getMessage().contains("99999"));
+    }
+
+    @Test
+    void resizeUnsupportedFormatThrowsIOException() {
+        byte[] notAnImage = "not an image at all, just some bytes".getBytes();
+        Exception ex = assertThrows(Exception.class,
+                () -> embedder.resizeImage("https://example.com/broken.bin", notAnImage));
+        assertTrue(ex instanceof java.io.IOException || ex instanceof RuntimeException,
+                "应为 IOException 或 RuntimeException 兜底，实际=" + ex.getClass().getSimpleName());
+        assertTrue(ex.getMessage() == null
+                        || ex.getMessage().toLowerCase().contains("unsupported")
+                        || ex.getMessage().toLowerCase().contains("unable"),
+                "异常消息应反映不支持/无法解析");
+    }
+
+    @Test
+    void safeDnsRejectsPrivateIpsOnLookup() {
+        SimilarAsinImageEmbedder.SafeDns safeDns = new SimilarAsinImageEmbedder.SafeDns(
+                hostname -> Collections.singletonList(InetAddress.getByName("127.0.0.1")));
+        UnknownHostException ex = assertThrows(UnknownHostException.class,
+                () -> safeDns.lookup("rebound.example.com"));
+        assertTrue(ex.getMessage().contains("blocked private/loopback ip"),
+                "异常消息应说明被阻断，实际=" + ex.getMessage());
+    }
+
+    @Test
+    void safeDnsAllowsPublicIpResolution() throws Exception {
+        SimilarAsinImageEmbedder.SafeDns safeDns = new SimilarAsinImageEmbedder.SafeDns(
+                hostname -> Collections.singletonList(InetAddress.getByName("8.8.8.8")));
+        List<InetAddress> result = safeDns.lookup("dns.google");
+        assertEquals(1, result.size());
+        assertEquals("8.8.8.8", result.get(0).getHostAddress());
+    }
+
+    @Test
+    void safeDnsRejectsMixedResultsContainingPrivateIp() {
+        SimilarAsinImageEmbedder.SafeDns safeDns = new SimilarAsinImageEmbedder.SafeDns(
+                hostname -> List.of(
+                        InetAddress.getByName("8.8.8.8"),
+                        InetAddress.getByName("10.0.0.5")));
+        // 任一结果落入私网即整体阻断，关闭 DNS rebinding 通道
+        assertThrows(UnknownHostException.class,
+                () -> safeDns.lookup("partial-rebound.example.com"));
+    }
+
+    @Test
+    void isPrivateIpCoversCgnatAndStandardRanges() throws Exception {
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("127.0.0.1")), "loopback");
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("10.0.0.1")), "10/8");
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("192.168.1.1")), "192.168/16");
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("169.254.0.1")), "link-local");
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("172.16.0.1")), "site-local 172.16");
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("100.64.0.1")), "CGNAT lower");
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("100.127.255.255")), "CGNAT upper");
+        assertFalse(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("8.8.8.8")), "public DNS");
+        assertFalse(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("100.63.0.1")), "below CGNAT 段");
+        assertFalse(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("100.128.0.1")), "above CGNAT 段");
+        // 受限广播
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("255.255.255.255")), "受限广播");
+        // IPv6 ULA fc00::/7
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("fc00::1")), "ULA fc00::");
+        assertTrue(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("fd12:3456:789a::1")), "ULA fd::");
+        // IPv6 公网放行
+        assertFalse(SimilarAsinImageEmbedder.isPrivateIp(InetAddress.getByName("2001:4860:4860::8888")), "Google IPv6 DNS");
+    }
+
+    @Test
+    void validateHttpsUrlRejectsHttpAndPrivateHosts() {
+        assertThrows(SimilarAsinImageEmbedder.UnsupportedUrlException.class,
+                () -> SimilarAsinImageEmbedder.validateHttpsUrl("http://example.com/a.jpg"));
+        assertThrows(SimilarAsinImageEmbedder.UnsupportedUrlException.class,
+                () -> SimilarAsinImageEmbedder.validateHttpsUrl("https://localhost/a.jpg"));
+        assertThrows(SimilarAsinImageEmbedder.UnsupportedUrlException.class,
+                () -> SimilarAsinImageEmbedder.validateHttpsUrl("https://127.0.0.1/a.jpg"));
+        assertThrows(SimilarAsinImageEmbedder.UnsupportedUrlException.class,
+                () -> SimilarAsinImageEmbedder.validateHttpsUrl("https://10.0.0.5/a.jpg"));
+        assertThrows(SimilarAsinImageEmbedder.UnsupportedUrlException.class,
+                () -> SimilarAsinImageEmbedder.validateHttpsUrl("https://192.168.1.1/a.jpg"));
+        assertThrows(SimilarAsinImageEmbedder.UnsupportedUrlException.class,
+                () -> SimilarAsinImageEmbedder.validateHttpsUrl("https://172.16.0.1/a.jpg"));
+        // 公网 https 应通过
+        SimilarAsinImageEmbedder.validateHttpsUrl("https://m.media-amazon.com/images/I/abc.jpg");
+        SimilarAsinImageEmbedder.validateHttpsUrl("https://cbu01.alicdn.com/img/ibank/xxx.jpg");
+    }
+
+    @Test
+    void downloadOversizeExceptionCarriesUrlAndSize() {
+        SimilarAsinImageEmbedder.DownloadOversizeException ex =
+                new SimilarAsinImageEmbedder.DownloadOversizeException("https://example.com/big.jpg", 12345678L);
+        assertEquals("https://example.com/big.jpg", ex.url());
+        assertEquals(12345678L, ex.size());
+        assertTrue(ex.getMessage().contains("oversize"));
+    }
+
+    @Test
+    void httpClientKeepsImageDownloadResilienceEnabled() {
+        assertTrue(embedder.httpClient().retryOnConnectionFailure(), "OkHttp should retry transient connection failures");
+        assertTrue(embedder.httpClient().followRedirects(), "image CDN redirects should be followed");
+        assertTrue(embedder.httpClient().followSslRedirects(), "signed CDN downloads should follow browser-like SSL redirects");
+    }
+
+    @Test
+    void buildImageRequestUsesBrowserLikeHeaders() {
+        var req = SimilarAsinImageEmbedder.buildImageRequest("https://m.media-amazon.com/images/I/abc.jpg");
+
+        assertEquals("GET", req.method());
+        assertTrue(req.header("User-Agent").contains("Chrome"), "User-Agent should look browser-like");
+        assertTrue(req.header("Accept").contains("image/"), "Accept should prefer images");
+        assertEquals("https://www.amazon.com/", req.header("Referer"));
+        assertEquals("no-cache", req.header("Cache-Control"));
+        assertNotNull(req.header("Accept-Language"));
+    }
+
+    @Test
+    void amazonImageDownloadCandidatesTrySmallerVariantsWithinRetryBudget() {
+        List<String> candidates = SimilarAsinImageEmbedder.downloadCandidates(
+                "https://m.media-amazon.com/images/I/71AGS2r4JML._AC_SX679_.jpg");
+
+        assertEquals(List.of(
+                "https://m.media-amazon.com/images/I/71AGS2r4JML._AC_SX679_.jpg",
+                "https://m.media-amazon.com/images/I/71AGS2r4JML._AC_SY450_.jpg",
+                "https://m.media-amazon.com/images/I/71AGS2r4JML._AC_SX425_.jpg"), candidates);
+    }
+
+    @Test
+    void downloadCandidatesLeaveNonAmazonAndUnsignedUrlsUntouched() {
+        String coze = "https://lf9-bot-platform-tos-sign.coze.cn/bot-studio-bot-platform/bot_files/1/image/jpeg/2/merged_image.jpg?x-expires=1&x-signature=a";
+        assertEquals(List.of(coze), SimilarAsinImageEmbedder.downloadCandidates(coze));
+        assertEquals(List.of("https://cbu01.alicdn.com/O1CN01x.jpg"),
+                SimilarAsinImageEmbedder.downloadCandidates("https://cbu01.alicdn.com/O1CN01x.jpg"));
+    }
+
+    @Test
+    void buildImageRequestUsesDownloadHeadersForCozeSignedImages() {
+        var req = SimilarAsinImageEmbedder.buildImageRequest(
+                "https://lf9-bot-platform-tos-sign.coze.cn/bot-studio-bot-platform/bot_files/1/image/jpeg/2/merged_image.jpg?x-expires=1&x-signature=a");
+
+        assertEquals("GET", req.method());
+        assertTrue(req.header("User-Agent").contains("Chrome"), "User-Agent should look browser-like");
+        assertEquals("*/*", req.header("Accept"));
+        assertNull(req.header("Referer"), "Coze signed download links should not carry an Amazon referer");
+        assertEquals("no-cache", req.header("Cache-Control"));
+        assertTrue(SimilarAsinImageEmbedder.isCozeSignedImageUrl(req.url().toString()));
+    }
+
+    @Test
+    void errorSummaryDoesNotHideEmptyTimeoutMessage() {
+        TimeoutException timeout = new TimeoutException();
+        assertEquals("TimeoutException: <empty>", SimilarAsinImageEmbedder.errorSummary(timeout));
+
+        IOException io = new IOException("outer", new TimeoutException("inner"));
+        String summary = SimilarAsinImageEmbedder.errorSummary(io);
+        assertTrue(summary.contains("IOException: outer"));
+        assertTrue(summary.contains("cause=TimeoutException: inner"));
+    }
+
+    private static SimilarAsinProperties properties(int poolSize, int prefetchTimeoutSeconds, Path cacheDir) {
+        SimilarAsinProperties properties = new SimilarAsinProperties();
+        properties.setImageDownloadPoolSize(poolSize);
+        properties.setImagePrefetchTimeoutSeconds(prefetchTimeoutSeconds);
+        properties.setImageLocalCacheDir(cacheDir == null ? "" : cacheDir.toString());
+        return properties;
+    }
+
+    private static OkHttpClient respondingClient(AtomicInteger calls, byte[] imageBytes) {
+        return new OkHttpClient.Builder()
+                .addInterceptor(chain -> {
+                    calls.incrementAndGet();
+                    return response(chain.request(), 200, "OK", imageBytes);
+                })
+                .build();
+    }
+
+    private static OkHttpClient failingClient(AtomicInteger calls) {
+        return new OkHttpClient.Builder()
+                .addInterceptor(chain -> {
+                    calls.incrementAndGet();
+                    return response(chain.request(), 503, "Unavailable", new byte[0]);
+                })
+                .build();
+    }
+
+    private static Response response(okhttp3.Request request,
+                                     int status,
+                                     String message,
+                                     byte[] body) {
+        return new Response.Builder()
+                .request(request)
+                .protocol(Protocol.HTTP_1_1)
+                .code(status)
+                .message(message)
+                .body(ResponseBody.create(body, MediaType.get("image/jpeg")))
+                .build();
+    }
+
+    private static void replaceHttpClient(SimilarAsinImageEmbedder target,
+                                          OkHttpClient httpClient) throws ReflectiveOperationException {
+        Field field = SimilarAsinImageEmbedder.class.getDeclaredField("httpClient");
+        field.setAccessible(true);
+        field.set(target, httpClient);
+    }
+
+    private static byte[] createJpegBytes() throws IOException {
+        BufferedImage image = new BufferedImage(64, 48, BufferedImage.TYPE_INT_RGB);
+        Graphics2D graphics = image.createGraphics();
+        try {
+            graphics.setColor(new Color(0x24, 0x68, 0xAC));
+            graphics.fillRect(0, 0, image.getWidth(), image.getHeight());
+        } finally {
+            graphics.dispose();
+        }
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+        ImageIO.write(image, "jpg", output);
+        return output.toByteArray();
+    }
+
+    private static void deleteRecursively(Path directory) throws IOException {
+        if (!Files.exists(directory)) {
+            return;
+        }
+        try (var paths = Files.walk(directory)) {
+            for (Path path : paths.sorted(java.util.Comparator.reverseOrder()).toList()) {
+                Files.deleteIfExists(path);
+            }
+        }
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixtureE2ETest.java

@@ -0,0 +1,172 @@
+package com.nanri.aiimage.modules.similarasin.util;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doAnswer;
+
+/**
+ * Task 20：Similar ASIN 端到端压测、JFR/GC 分析与结果文件兼容回归。
+ * SimilarAsinPerfFixture 新增三个功能点：
+ * - endToEndBenchmark：生成 → 分 chunk → 序列化 → 计时 → 吞吐与峰值堆采样；
+ * - gcStressAnalysis：多轮生成/释放循环采样 GC 计数与堆峰值；
+ * - compatRoundTrip：payload 序列化往返恢复全量行并校验字段稳定（结果文件兼容回归）。
+ */
+@ExtendWith(MockitoExtension.class)
+class SimilarAsinPerfFixtureE2ETest {
+
+    @Spy private ObjectMapper objectMapper = new ObjectMapper();
+
+    @Test
+    void test_task_020_asin_normal_default_path() {
+        // 正常输入：1000 行端到端基准返回完整指标，行数/chunk 数正确，吞吐与堆峰值有界。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.EndToEndMetrics metrics =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-default.xlsx", 1000, false, 200);
+
+        assertEquals(1000, metrics.rowCount(), "行数不丢失");
+        assertEquals(5, metrics.chunkCount(), "1000 行 / 200 每 chunk = 5 个 chunk");
+        assertTrue(metrics.payloadBytes() > 0, "payload 字节可采样");
+        assertTrue(metrics.assembleMillis() >= 0);
+        assertTrue(metrics.throughputRowsPerSec() > 0, "吞吐必须为正");
+        assertTrue(metrics.peakHeapBytes() > 0, "峰值堆必须为正");
+    }
+
+    @Test
+    void test_task_020_asin_normal_multiple_items() {
+        // 批量场景：图片开/关两种模式 5000 行，结果不丢失、chunk 划分稳定。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.EndToEndMetrics withImages =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-img.xlsx", 5000, true, 200);
+        SimilarAsinPerfFixture.EndToEndMetrics textOnly =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-text.xlsx", 5000, false, 200);
+
+        assertEquals(5000, withImages.rowCount());
+        assertEquals(5000, textOnly.rowCount());
+        assertEquals(25, withImages.chunkCount());
+        assertEquals(25, textOnly.chunkCount());
+        assertTrue(withImages.payloadBytes() > textOnly.payloadBytes(), "图片模式 payload 必须大于纯文本");
+    }
+
+    @Test
+    void test_task_020_asin_normal_repeated_operation_is_idempotent() throws Exception {
+        // 重复执行：同一输入两次基准的指标一致，不产生重复行。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.CompatResult first =
+                fixture.compatRoundTrip("uploads/20260829/e2e-idem.xlsx", 1000, true);
+        SimilarAsinPerfFixture.CompatResult second =
+                fixture.compatRoundTrip("uploads/20260829/e2e-idem.xlsx", 1000, true);
+
+        assertEquals(1000, first.rowCount());
+        assertEquals(1000, first.recoveredCount(), "往返恢复全量行");
+        assertTrue(first.fieldStable(), "字段必须稳定");
+        assertEquals(first.rowCount(), second.rowCount());
+        assertEquals(first.recoveredCount(), second.recoveredCount());
+        assertEquals(first.fieldStable(), second.fieldStable());
+    }
+
+    @Test
+    void test_task_020_asin_boundary_empty_input() {
+        // 空输入：0 行基准返回零指标；0 行往返返回空结果，不创建资源。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.EndToEndMetrics metrics =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-empty.xlsx", 0, false, 200);
+        assertEquals(0, metrics.rowCount());
+        assertEquals(0, metrics.chunkCount());
+        assertEquals(0, metrics.payloadBytes());
+
+        SimilarAsinPerfFixture.CompatResult compat =
+                fixture.compatRoundTrip("uploads/20260829/e2e-empty.xlsx", 0, false);
+        assertEquals(0, compat.rowCount());
+        assertEquals(0, compat.recoveredCount());
+        assertTrue(compat.fieldStable(), "空结果字段稳定");
+    }
+
+    @Test
+    void test_task_020_asin_boundary_single_item() {
+        // 单元素：1 行基准不依赖批量路径，往返字段一致。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        SimilarAsinPerfFixture.EndToEndMetrics metrics =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-single.xlsx", 1, true, 200);
+        assertEquals(1, metrics.rowCount());
+        assertEquals(1, metrics.chunkCount());
+
+        SimilarAsinPerfFixture.CompatResult compat =
+                fixture.compatRoundTrip("uploads/20260829/e2e-single.xlsx", 1, true);
+        assertEquals(1, compat.recoveredCount());
+        assertTrue(compat.fieldStable());
+    }
+
+    @Test
+    void test_task_020_asin_boundary_limit_and_overflow() {
+        // 上限/超限：超过 MAX_ROWS 拒绝；5000 行基准在预算内完成，不发生无界内存增长。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        IllegalArgumentException overflow = assertThrows(IllegalArgumentException.class,
+                () -> fixture.endToEndBenchmark("uploads/20260829/e2e-over.xlsx",
+                        SimilarAsinPerfFixture.MAX_ROWS + 1, false, 200));
+        assertTrue(overflow.getMessage().contains("rowCount"), "超限消息应可识别");
+        assertThrows(IllegalArgumentException.class,
+                () -> fixture.compatRoundTrip("uploads/20260829/e2e-over.xlsx",
+                        SimilarAsinPerfFixture.MAX_ROWS + 1, false));
+
+        SimilarAsinPerfFixture.EndToEndMetrics metrics =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-max.xlsx", 5000, true, 200);
+        assertTrue(metrics.assembleMillis() < 15000,
+                "5000 行端到端基准须在预算内完成，实际=" + metrics.assembleMillis() + "ms");
+        assertTrue(metrics.peakHeapBytes() < 1024L * 1024L * 1024L, "峰值堆不得超过 1GB");
+    }
+
+    @Test
+    void test_task_020_asin_invalid_input_rejected() {
+        // 非法参数：null key/非法 chunkSize/非法 GC 行数 → 明确异常与可识别消息。
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        IllegalArgumentException nullKey = assertThrows(IllegalArgumentException.class,
+                () -> fixture.endToEndBenchmark(null, 100, false, 200));
+        assertTrue(nullKey.getMessage().contains("sourceFileKey"));
+        assertThrows(IllegalArgumentException.class,
+                () -> fixture.endToEndBenchmark("uploads/20260829/x.xlsx", 100, false, 0));
+        assertThrows(IllegalArgumentException.class,
+                () -> fixture.gcStressAnalysis(null, 100, false));
+        assertThrows(IllegalArgumentException.class,
+                () -> fixture.gcStressAnalysis("uploads/20260829/x.xlsx", -1, false));
+    }
+
+    @Test
+    void test_task_020_asin_dependency_failure_releases_resources() throws Exception {
+        // 依赖失败：序列化失败抛 IllegalStateException 且不产生部分结果；恢复后重试成功；
+        // GC 分析后堆峰值回落（临时对象释放）。
+        AtomicInteger failCount = new AtomicInteger(0);
+        doAnswer(invocation -> {
+            if (failCount.getAndIncrement() == 0) {
+                throw new IOException("rustfs down");
+            }
+            return invocation.callRealMethod();
+        }).when(objectMapper).writeValueAsBytes(any());
+
+        SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(objectMapper);
+        assertThrows(IllegalStateException.class,
+                () -> fixture.endToEndBenchmark("uploads/20260829/e2e-fail.xlsx", 100, false, 200));
+        SimilarAsinPerfFixture.EndToEndMetrics recovered =
+                fixture.endToEndBenchmark("uploads/20260829/e2e-fail.xlsx", 100, false, 200);
+        assertEquals(100, recovered.rowCount(), "依赖恢复后重试成功");
+
+        SimilarAsinPerfFixture.GcStressSample gc =
+                fixture.gcStressAnalysis("uploads/20260829/e2e-gc.xlsx", 1000, true);
+        assertNotNull(gc);
+        assertTrue(gc.rounds() >= 1, "GC 分析至少执行一轮");
+        assertTrue(gc.gcCount() >= 0);
+        assertTrue(gc.peakHeapBytes() > 0, "堆峰值必须可采样");
+        assertTrue(gc.peakHeapBytes() < 1024L * 1024L * 1024L, "GC 分析峰值堆不得超过 1GB");
+    }
+}

backend-java/src/test/java/com/nanri/aiimage/modules/similarasin/util/SimilarAsinPerfFixtureTest.java

@@ -0,0 +1,198 @@
+package com.nanri.aiimage.modules.similarasin.util;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nanri.aiimage.modules.similarasin.model.vo.SimilarAsinParsedRowVo;
+import org.junit.jupiter.api.Test;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Task 1：Similar ASIN 性能基线夹具（1000/5000 行、图片开关、chunk 数与 payload 大小采样）。
+ * 先写测试确认 RED，再实现 SimilarAsinPerfFixture。
+ */
+class SimilarAsinPerfFixtureTest {
+
+    private final SimilarAsinPerfFixture fixture = new SimilarAsinPerfFixture(new ObjectMapper());
+
+    @Test
+    void test_task_001_payload_chunk_image_normal_default_path() {
+        // 1000 行、带图片开关，默认 chunk 大小
+        List<SimilarAsinParsedRowVo> rows = fixture.generateRows("uploads/20260829/base.xlsx", 1000, true);
+        assertEquals(1000, rows.size());
+        // 行必须包含 url 图片地址
+        assertFalse(rows.get(0).getUrl().isBlank());
+        assertTrue(rows.get(0).getUrl().startsWith("http"));
+        // rowToken 稳定且唯一
+        assertEquals(rows.get(0).getRowToken(), fixture.rowTokenFor(rows.get(0).getSourceFileKey(), rows.get(0).getRowIndex()));
+        assertEquals(1000, rows.stream().map(SimilarAsinParsedRowVo::getRowToken).distinct().count());
+
+        List<List<SimilarAsinParsedRowVo>> chunks = fixture.splitChunks(rows, 200);
+        assertEquals(5, chunks.size());
+        assertEquals(200, chunks.get(0).size());
+
+        SimilarAsinPerfFixture.Metrics metrics = fixture.samplePayload(rows, true, 200);
+        assertEquals(1000, metrics.rowCount());
+        assertEquals(5, metrics.chunkCount());
+        assertTrue(metrics.payloadBytes() > 0, "payload 采样字节数必须大于 0");
+    }
+
+    @Test
+    void test_task_001_payload_chunk_image_normal_multiple_items() {
+        // 5000 行批量场景：顺序稳定、chunk 数正确、结果不丢失
+        List<SimilarAsinParsedRowVo> rows = fixture.generateRows("uploads/20260829/multi.xlsx", 5000, false);
+        assertEquals(5000, rows.size());
+        assertTrue(rows.get(0).getUrl().isBlank(), "图片开关关闭时 url 必须为空");
+
+        List<List<SimilarAsinParsedRowVo>> chunks = fixture.splitChunks(rows, 200);
+        assertEquals(25, chunks.size());
+        // 顺序稳定：拼接后与原始一致
+        List<SimilarAsinParsedRowVo> restored = chunks.stream().flatMap(List::stream).toList();
+        assertEquals(rows.size(), restored.size());
+        for (int i = 0; i < rows.size(); i++) {
+            assertEquals(rows.get(i).getRowToken(), restored.get(i).getRowToken());
+        }
+        // 所有行 rowIndex 递增
+        for (int i = 0; i < rows.size(); i++) {
+            assertEquals(i + 1, rows.get(i).getRowIndex());
+        }
+    }
+
+    @Test
+    void test_task_001_payload_chunk_image_normal_repeated_operation_is_idempotent() {
+        List<SimilarAsinParsedRowVo> first = fixture.generateRows("uploads/20260829/idem.xlsx", 1000, true);
+        List<SimilarAsinParsedRowVo> second = fixture.generateRows("uploads/20260829/idem.xlsx", 1000, true);
+        // 同一输入重复生成：token 完全一致，不产生重复差异
+        assertEquals(first.size(), second.size());
+        for (int i = 0; i < first.size(); i++) {
+            assertEquals(first.get(i).getRowToken(), second.get(i).getRowToken());
+            assertEquals(first.get(i).getAsin(), second.get(i).getAsin());
+        }
+        // splitChunks 幂等：两次划分 chunk 数一致
+        assertEquals(fixture.splitChunks(first, 200).size(), fixture.splitChunks(second, 200).size());
+        // 采样指标幂等
+        SimilarAsinPerfFixture.Metrics m1 = fixture.samplePayload(first, true, 200);
+        SimilarAsinPerfFixture.Metrics m2 = fixture.samplePayload(second, true, 200);
+        assertEquals(m1.payloadBytes(), m2.payloadBytes());
+    }
+
+    @Test
+    void test_task_001_payload_chunk_image_boundary_empty_input() {
+        List<SimilarAsinParsedRowVo> rows = fixture.generateRows("uploads/20260829/empty.xlsx", 0, true);
+        assertNotNull(rows);
+        assertEquals(0, rows.size());
+        // 空行 splitChunks 返回空，不产生无效 chunk
+        assertEquals(0, fixture.splitChunks(rows, 200).size());
+        // 空行采样：行数 0、chunk 0、payload 字节数为 0（不创建任何载荷）
+        SimilarAsinPerfFixture.Metrics metrics = fixture.samplePayload(rows, true, 200);
+        assertEquals(0, metrics.rowCount());
+        assertEquals(0, metrics.chunkCount());
+        assertEquals(0, metrics.payloadBytes());
+    }
+
+    @Test
+    void test_task_001_payload_chunk_image_boundary_single_item() {
+        // 单行：不依赖批量路径且结果正确
+        List<SimilarAsinParsedRowVo> rows = fixture.generateRows("uploads/20260829/single.xlsx", 1, true);
+        assertEquals(1, rows.size());
+        assertEquals(1, rows.get(0).getRowIndex());
+        assertEquals(1, fixture.splitChunks(rows, 200).size());
+        // 单行 chunk 划分后仍只含 1 行
+        List<List<SimilarAsinParsedRowVo>> chunks = fixture.splitChunks(rows, 200);
+        assertEquals(1, chunks.get(0).size());
+        SimilarAsinPerfFixture.Metrics metrics = fixture.samplePayload(rows, true, 200);
+        assertEquals(1, metrics.rowCount());
+        assertEquals(1, metrics.chunkCount());
+        assertTrue(metrics.payloadBytes() > 0);
+    }
+
+    @Test
+    void test_task_001_payload_chunk_image_boundary_limit_and_overflow() {
+        // 超过最大行数（5000）时拒绝，不发生无界内存增长
+        assertThrows(IllegalArgumentException.class, () -> fixture.generateRows("uploads/20260829/overflow.xlsx", 5001, true));
+        // 达到最大允许值 5000 时允许
+        assertEquals(5000, fixture.generateRows("uploads/20260829/max.xlsx", 5000, true).size());
+        // chunkSize 非法值拒绝
+        assertThrows(IllegalArgumentException.class, () -> fixture.splitChunks(fixture.generateRows("uploads/20260829/a.xlsx", 100, true), 0));
+        assertThrows(IllegalArgumentException.class, () -> fixture.splitChunks(fixture.generateRows("uploads/20260829/b.xlsx", 100, true), -1));
+    }
+
+    @Test
+    void test_task_001_payload_chunk_image_invalid_input_rejected() {
+        // null 文件 key 拒绝
+        assertThrows(IllegalArgumentException.class, () -> fixture.generateRows(null, 100, true));
+        // 空白文件 key 拒绝
+        assertThrows(IllegalArgumentException.class, () -> fixture.generateRows("   ", 100, true));
+        // 负行数拒绝
+        assertThrows(IllegalArgumentException.class, () -> fixture.generateRows("uploads/20260829/neg.xlsx", -1, true));
+        // null 行集合分块拒绝
+        assertThrows(IllegalArgumentException.class, () -> fixture.splitChunks(null, 200));
+    }
+
+    @Test
+    void test_task_001_payload_chunk_image_dependency_failure_releases_resources() {
+        // 采样时序列化器失败（mock 抛异常）：错误可恢复，不产生部分结果
+        ObjectMapper broken = new ObjectMapper() {
+            @Override
+            public String writeValueAsString(Object value) {
+                throw new IllegalStateException("serializer down");
+            }
+        };
+        SimilarAsinPerfFixture failingFixture = new SimilarAsinPerfFixture(broken);
+        List<SimilarAsinParsedRowVo> rows = failingFixture.generateRows("uploads/20260829/fail.xlsx", 1000, true);
+        assertThrows(IllegalStateException.class, () -> failingFixture.samplePayload(rows, true, 200));
+        // 恢复后（换回正常 mapper）仍能正常工作
+        SimilarAsinPerfFixture.Metrics recovered = fixture.samplePayload(fixture.generateRows("uploads/20260829/recover.xlsx", 1000, true), true, 200);
+        assertTrue(recovered.payloadBytes() > 0);
+        assertNotNull(recovered);
+        // 行对象在失败后仍可复用（不持有任何锁或已关闭资源）
+        assertTrue(rows.get(0).getAsin().startsWith("B0"));
+        // 验证图片开关两种模式下行字段差异明确
+        List<SimilarAsinParsedRowVo> noImg = fixture.generateRows("uploads/20260829/nimg.xlsx", 10, false);
+        assertTrue(noImg.get(0).getUrl().isBlank());
+    }
+
+    @Test
+    void test_task_001_payload_chunk_image_normal_fields_populated() {
+        // 行字段完整性：asin/country/sku/title/values 均填充且稳定
+        List<SimilarAsinParsedRowVo> rows = fixture.generateRows("uploads/20260829/fields.xlsx", 10, false);
+        SimilarAsinParsedRowVo row = rows.get(3);
+        assertTrue(row.getAsin().matches("B0[A-Z0-9]{8}"));
+        assertFalse(row.getCountry().isBlank());
+        assertFalse(row.getSku().isBlank());
+        assertFalse(row.getTitle().isBlank());
+        assertNotNull(row.getValues());
+        assertFalse(row.getValues().isEmpty());
+        assertTrue(row.getValues().containsKey("asin"));
+        assertTrue(row.getValues().containsKey("国家"));
+        // 行号与 sourceId 关联正确
+        assertEquals("4", row.getSourceId());
+        assertEquals(4, row.getRowIndex());
+        // values 是独立副本，修改不影响后续生成
+        row.getValues().put("价格", "999");
+        List<SimilarAsinParsedRowVo> again = fixture.generateRows("uploads/20260829/fields.xlsx", 10, false);
+        assertTrue(!again.get(3).getValues().getOrDefault("价格", "").equals("999"));
+    }
+
+    @Test
+    void test_task_001_payload_chunk_image_boundary_chunk_size_edge() {
+        // chunk 边界：行数恰好整除 / 有余数 / 单 chunk 放不下
+        List<SimilarAsinParsedRowVo> rows = fixture.generateRows("uploads/20260829/edge.xlsx", 100, false);
+        // 100 行 / 40 → 3 chunks（40+40+20）
+        List<List<SimilarAsinParsedRowVo>> chunks = fixture.splitChunks(rows, 40);
+        assertEquals(3, chunks.size());
+        assertEquals(40, chunks.get(0).size());
+        assertEquals(20, chunks.get(2).size());
+        // chunkSize 大于总行数 → 单 chunk
+        assertEquals(1, fixture.splitChunks(rows, 500).size());
+        // chunkSize 恰好等于行数 → 单 chunk 全量
+        assertEquals(1, fixture.splitChunks(rows, 100).size());
+        assertEquals(100, fixture.splitChunks(rows, 100).get(0).size());
+    }
+}