diff --git a/backend-java/src/test/java/com/nanri/aiimage/modules/task/contract/CollectDataSelfConsistencyTest.java b/backend-java/src/test/java/com/nanri/aiimage/modules/task/contract/CollectDataSelfConsistencyTest.java
new file mode 100644
index 00000000..319da2ac
--- /dev/null
+++ b/backend-java/src/test/java/com/nanri/aiimage/modules/task/contract/CollectDataSelfConsistencyTest.java
@@ -0,0 +1,102 @@
+package com.nanri.aiimage.modules.task.contract;
+
+import com.nanri.aiimage.modules.collectdata.model.vo.CollectDataHistoryItemVo;
+import org.junit.jupiter.api.Test;
+
+import java.lang.reflect.Field;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * task-146：collectdata 自洽行为契约（plan 08）。
+ * 后端 history VO 不返回 file 阶段字段（fileStatus/fileReady/fileError）；
+ * 下载语义由 success + downloadUrl 推导（任务 SUCCESS 且有结果文件才可下载）；
+ * 进度展示字段自洽。
+ */
+class CollectDataSelfConsistencyTest {
+
+    private static Map<String, Class<?>> fieldsOf(Class<?> type) {
+        return Arrays.stream(type.getDeclaredFields())
+                .filter(field -> !java.lang.reflect.Modifier.isStatic(field.getModifiers()))
+                .collect(Collectors.toMap(Field::getName, Field::getType));
+    }
+
+    @Test
+    void backendHasNoFilePhaseFields() {
+        Map<String, Class<?>> fields = fieldsOf(CollectDataHistoryItemVo.class);
+        assertFalse(fields.containsKey("fileStatus"), "collectdata 不返回 fileStatus");
+        assertFalse(fields.containsKey("fileReady"), "collectdata 不返回 fileReady");
+        assertFalse(fields.containsKey("fileError"), "collectdata 不返回 fileError");
+        assertFalse(fields.containsKey("fileProgressPercent"), "collectdata 不返回 fileProgressPercent");
+    }
+
+    @Test
+    void downloadFieldsPresent() {
+        Map<String, Class<?>> fields = fieldsOf(CollectDataHistoryItemVo.class);
+        assertEquals(String.class, fields.get("downloadUrl"), "downloadUrl 字段存在");
+        assertEquals(Boolean.class, fields.get("success"), "success 字段存在");
+    }
+
+    @Test
+    void statusFlowFieldsPresent() {
+        Map<String, Class<?>> fields = fieldsOf(CollectDataHistoryItemVo.class);
+        assertEquals(String.class, fields.get("taskStatus"), "taskStatus 字段存在");
+        assertEquals(String.class, fields.get("error"), "error 字段存在");
+        assertEquals(Long.class, fields.get("taskId"));
+        assertEquals(Long.class, fields.get("resultId"));
+    }
+
+    @Test
+    void progressDisplayFieldsPresent() {
+        Map<String, Class<?>> fields = fieldsOf(CollectDataHistoryItemVo.class);
+        assertEquals(Integer.class, fields.get("dedupeFilteredCount"), "进度展示字段存在");
+        assertEquals(Integer.class, fields.get("invalidFilteredCount"));
+        assertEquals(Integer.class, fields.get("brandRejectedCount"));
+        assertEquals(Integer.class, fields.get("finalRowCount"));
+        assertEquals(Integer.class, fields.get("rowCount"));
+    }
+
+    @Test
+    void successAndUrlAreTheOnlyDownloadSignals() {
+        Map<String, Class<?>> fields = fieldsOf(CollectDataHistoryItemVo.class);
+        // 可下载信号仅 success + downloadUrl（无 fileReady 类独立标志）
+        assertTrue(fields.containsKey("success"));
+        assertTrue(fields.containsKey("downloadUrl"));
+        assertFalse(fields.containsKey("fileReady"));
+    }
+
+    @Test
+    void fileFieldsAbsentEvenInSharedLightVoContract() {
+        Map<String, Class<?>> fields = fieldsOf(CollectDataHistoryItemVo.class);
+        assertFalse(fields.containsKey("fileJobId"), "collectdata 无 fileJobId");
+        assertFalse(fields.containsKey("fileJobStatus"), "collectdata 无 fileJobStatus");
+    }
+
+    @Test
+    void historyIdentityFieldsPresent() {
+        Map<String, Class<?>> fields = fieldsOf(CollectDataHistoryItemVo.class);
+        assertEquals(String.class, fields.get("sourceFilename"));
+        assertEquals(String.class, fields.get("resultFilename"));
+        assertEquals(String.class, fields.get("taskNo"));
+    }
+
+    @Test
+    void contractFrozenFieldSet() {
+        Map<String, Class<?>> fields = fieldsOf(CollectDataHistoryItemVo.class);
+        // 快照：字段集合固定（下载用 success+downloadUrl，无 file 阶段字段）
+        java.util.Set<String> expected = java.util.Set.of(
+                "resultId", "taskId", "taskNo", "sourceFilename", "resultFilename", "downloadUrl",
+                "taskStatus", "success", "error", "rowCount", "dedupeFilteredCount",
+                "invalidFilteredCount", "brandRejectedCount", "finalRowCount",
+                "taskType", "progressPercent", "totalRows", "receivedRows", "processedRows",
+                "collectStage", "currentKeyword", "searchCurrentPage", "searchTotalPages",
+                "detailProcessedAsins", "detailTotalAsins", "filters",
+                "createdAt", "startedAt", "finishedAt");
+        assertEquals(expected, fields.keySet(), "collectdata history VO 字段集合冻结");
+    }
+}
diff --git a/frontend-vue/src/shared/collect-download.ts b/frontend-vue/src/shared/collect-download.ts
new file mode 100644
index 00000000..3128f011
--- /dev/null
+++ b/frontend-vue/src/shared/collect-download.ts
@@ -0,0 +1,18 @@
+/**
+ * collectdata 下载判定（Task 146）。
+ *
+ * collectdata 后端 history VO 不返回 file 阶段字段；前端下载判定自洽：
+ * success=true 且 downloadUrl 非空才可下载（任务成功且有结果文件）。
+ */
+export interface CollectDataItem {
+  success?: boolean | null
+  downloadUrl?: string | null
+  taskStatus?: string | null
+}
+
+/** collectdata 可下载判定：success + downloadUrl（任务成功且有结果文件，空白 URL 无效）。 */
+export function canDownloadCollectDataItem(item: CollectDataItem | null | undefined): boolean {
+  if (!item) return false
+  const url = typeof item.downloadUrl === 'string' ? item.downloadUrl.trim() : ''
+  return Boolean(item.success && url)
+}
diff --git a/frontend-vue/tests/collect-download.test.ts b/frontend-vue/tests/collect-download.test.ts
new file mode 100644
index 00000000..daeaf0b6
--- /dev/null
+++ b/frontend-vue/tests/collect-download.test.ts
@@ -0,0 +1,43 @@
+import { test } from 'node:test'
+import assert from 'node:assert/strict'
+
+import { canDownloadCollectDataItem } from '../src/shared/collect-download.ts'
+
+interface Item {
+  success?: boolean | null
+  downloadUrl?: string | null
+  taskStatus?: string | null
+}
+
+test('collectdata downloadable when success and url present', () => {
+  assert.equal(canDownloadCollectDataItem({ success: true, downloadUrl: 'https://dl.example/a.xlsx' }), true)
+})
+
+test('collectdata not downloadable without url', () => {
+  assert.equal(canDownloadCollectDataItem({ success: true }), false)
+  assert.equal(canDownloadCollectDataItem({ success: true, downloadUrl: null }), false)
+  assert.equal(canDownloadCollectDataItem({ success: true, downloadUrl: '' }), false)
+})
+
+test('collectdata failed task not downloadable', () => {
+  assert.equal(canDownloadCollectDataItem({ success: false, downloadUrl: 'https://dl.example/a.xlsx' }), false)
+})
+
+test('collectdata url must be non-blank to be valid', () => {
+  assert.equal(canDownloadCollectDataItem({ success: true, downloadUrl: '   ' }), false)
+  assert.equal(canDownloadCollectDataItem({ success: true, downloadUrl: 'https://x' }), true)
+})
+
+test('collectdata progress display fields do not include file phase', () => {
+  const item: Item = { success: false, taskStatus: 'RUNNING' }
+  assert.equal('fileStatus' in item, false, 'collectdata 无 file 阶段字段（与后端 VO 自洽）')
+  assert.equal('fileReady' in item, false)
+  assert.equal('fileProgressPercent' in item, false)
+})
+
+test('collectdata semantics frozen', () => {
+  assert.equal(canDownloadCollectDataItem(undefined), false)
+  assert.equal(canDownloadCollectDataItem(null), false)
+  assert.equal(canDownloadCollectDataItem({}), false)
+  assert.equal(canDownloadCollectDataItem({ success: true, downloadUrl: 'x', taskStatus: 'SUCCESS' }), true)
+})