feat: 上游显示真实发送人 — 从task_logs追溯created_by

backend/app/services/product_service.py

@@ -42,6 +42,7 @@ def _task_to_response(task: Task) -> TaskResponse:
         created_at=task.created_at,
         child_tasks=[_task_to_response(c) for c in task.child_tasks],
         records=[TaskRecordResponse.model_validate(r) for r in (task.records or [])],
+        created_by=getattr(task, "created_by", None),
     )
 
 
@@ -85,15 +86,54 @@ async def get_product_by_serial(db: AsyncSession, serial_number: str) -> Product
 
     # 🔧 收集任务树中所有 assignee_id → 查中文姓名映射
     assignee_ids: set[str] = set()
+    all_task_ids: list[uuid.UUID] = []
     def _collect_ids(tasks):
         for t in tasks:
+            all_task_ids.append(t.id)
             if t.assignee_id: assignee_ids.add(t.assignee_id)
             if t.child_tasks: _collect_ids(t.child_tasks)
     for t in top_tasks:
+        all_task_ids.append(t.id)
         if t.assignee_id: assignee_ids.add(t.assignee_id)
     _collect_ids(task_tree)
     assignee_names = _lookup_display_names(list(assignee_ids))
 
+    # 🔧 批量查 task_logs: 谁创建了每个任务
+    creator_map: dict[uuid.UUID, str] = {}
+    if all_task_ids:
+        from app.models.task_log import TaskLog
+        # 每个 task 取最早的 create 日志的 operator_id
+        sub = (
+            select(
+                TaskLog.task_id,
+                TaskLog.operator_id,
+                func.row_number().over(
+                    partition_by=TaskLog.task_id,
+                    order_by=TaskLog.created_at.asc()
+                ).label("rn")
+            )
+            .where(
+                TaskLog.task_id.in_(all_task_ids),
+                TaskLog.action_type == "create"
+            )
+        ).subquery()
+        log_result = await db.execute(
+            select(sub.c.task_id, sub.c.operator_id).where(sub.c.rn == 1)
+        )
+        for row in log_result:
+            if row[1]:
+                creator_map[row[0]] = row[1]
+
+    # 注入 created_by 到 task_tree 和 top_tasks
+    def _inject_creator(tasks):
+        for t in tasks:
+            t.created_by = creator_map.get(t.id)
+            if t.child_tasks:
+                _inject_creator(t.child_tasks)
+    _inject_creator(task_tree)
+    for t in top_tasks:
+        t.created_by = creator_map.get(t.id)
+
     return ProductScanResponse(
         id=product.id,
         serial_number=product.serial_number,