修复撤回500: 先删task_logs+task_records再删task,加delete import

backend/app/services/task_service.py

@@ -2,7 +2,7 @@
 from __future__ import annotations
 import uuid
 from fastapi import HTTPException, status
-from sqlalchemy import select
+from sqlalchemy import select, delete
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload
 
@@ -337,6 +337,11 @@ async def recall_task(
         product.current_location_id = parent.assignee_id
         product.overall_status = parent.task_name
 
+    # 先删除关联的 task_logs 和 task_records
+    await db.execute(delete(TaskLog).where(TaskLog.task_id == task_id))
+    await db.execute(delete(TaskRecord).where(TaskRecord.task_id == task_id))
+    await db.flush()
+
     # 删除 PENDING 子任务
     await db.delete(task)