task-71: 清理日志改为数量与 sample ID，禁止输出超长任务 ID 列表

backend-java/src/main/java/com/nanri/aiimage/modules/task/service/ModuleHistoryCleanupService.java

@@ -44,6 +44,7 @@ public class ModuleHistoryCleanupService {
     private static final Duration CLEANUP_LOCK_TTL = Duration.ofHours(2);
     private static final String COLLECT_DATA_MODULE_TYPE = "COLLECT_DATA";
     private static final int DEFAULT_BATCH_SIZE = 500;
+    private static final int LOG_SAMPLE_IDS = 5;
 
     private final ModuleCleanupProperties moduleCleanupProperties;
     private final FileTaskMapper fileTaskMapper;
@@ -166,7 +167,7 @@ public class ModuleHistoryCleanupService {
                         int deletedRows = deleteRows(types, taskIds, collectDataTaskIds);
                         submitAndFlush(collected);
                         log.info("[module-cleanup] batch: taskIds={}, deletedRows={}, collectedPointers={}",
-                                taskIds, deletedRows, collected.size());
+                                formatIdSample(taskIds, LOG_SAMPLE_IDS), deletedRows, collected.size());
                     });
                     totalBatches++;
                     totalDeletedTasks += taskIds.size();
@@ -181,7 +182,8 @@ public class ModuleHistoryCleanupService {
             log.info("[module-cleanup] completed: moduleTypes={}, retentionDays={}, cutoff={}, batches={}, deletedTasks={}, collectedPayloadPointers={}, skippedActiveTaskIds={}, retainedTaskIds={}",
                     moduleTypes, moduleCleanupProperties.getRetentionDays(), cutoff,
                     totalBatches, totalDeletedTasks, totalCollectedPointers,
-                    skippedActiveTaskIds, skippedRetainedTaskIds);
+                    formatIdSample(skippedActiveTaskIds, LOG_SAMPLE_IDS),
+                    formatIdSample(skippedRetainedTaskIds, LOG_SAMPLE_IDS));
         }
     }
 
@@ -285,4 +287,27 @@ public class ModuleHistoryCleanupService {
             pointers.add(pointer);
         }
     }
+
+    /**
+     * 日志用 ID 摘要：只输出数量与最多 {@code sampleLimit} 个样本，
+     * 禁止把超长任务 ID 列表写进日志。非法上限回退到 1，null/空输出 count=0。
+     */
+    static String formatIdSample(List<Long> ids, int sampleLimit) {
+        int count = ids == null ? 0 : ids.size();
+        if (count == 0) {
+            return "count=0";
+        }
+        int limit = Math.max(1, sampleLimit);
+        StringBuilder sb = new StringBuilder("count=").append(count).append(", sample=[");
+        for (int i = 0; i < Math.min(count, limit); i++) {
+            if (i > 0) {
+                sb.append(',');
+            }
+            sb.append(ids.get(i));
+        }
+        if (count > limit) {
+            sb.append(",...");
+        }
+        return sb.append(']').toString();
+    }
 }