fix: 三致命Bug—macro_status预计算+排除已完工脏读+flush落盘+递归深度限制10

backend/app/services/task_service.py

@@ -74,6 +74,7 @@ async def _recalc_product_location(db: AsyncSession, product_id: uuid.UUID, comp
         sa_select(Task).where(
             Task.product_id == product_id,
             Task.status == TASK_STATUS_WIP,
+            Task.id != completed_task_id,  # 🔧 排除刚刚完工的任务（避免脏读）
         ).order_by(Task.created_at.desc())
     )
     wip_tasks = task_result.scalars().all()
@@ -94,6 +95,7 @@ async def _recalc_product_location(db: AsyncSession, product_id: uuid.UUID, comp
 
     if product.current_location_id != new_location:
         product.current_location_id = new_location
+        await db.flush()  # 🔧 确保位置更新落盘到当前事务
 
 
 def _check_permission(task_assignee_id: str | None, operator_id: str | None, operator_role: str | None = None) -> None: