修复：补强使用并发幂等复核

shierfeng-fastapi-backend/module_business/service/usage_service.py

@@ -169,6 +169,7 @@ class UsageService:
                 query_db,
                 page_object.idempotency_key,
                 site_ids=site_ids,
+                for_update=False,
             )
             if recovered is None:
                 raise ServiceException(message='使用失败，数据冲突')
@@ -344,6 +345,7 @@ class UsageService:
                 query_db,
                 page_object.idempotency_key,
                 site_ids=site_ids,
+                for_update=False,
             )
             if existing is not None:
                 if not cls._is_exact_idempotent_result(existing, page_object, request_hash):
@@ -385,12 +387,38 @@ class UsageService:
                 cls._raise_pallet_not_accessible(current_user)
             pallet = locked_pallets[0]
 
+            filling = (
+                await OperationDao.get_active_filling_for_update(
+                    query_db,
+                    inventory.active_filling_id,
+                )
+                if inventory.active_filling_id is not None
+                else None
+            )
+            locked_existing = await OperationDao.get_usage_by_idempotency_key(
+                query_db,
+                page_object.idempotency_key,
+                site_ids=site_ids,
+                for_update=True,
+            )
+            if locked_existing is not None:
+                if locked_existing.site_id != inventory.site_id or not cls._is_exact_idempotent_result(
+                    locked_existing,
+                    page_object,
+                    request_hash,
+                ):
+                    raise ServiceException(message='使用失败，幂等键已被其他请求使用')
+                await cls._lock_and_reauthorize_usage_site(
+                    query_db,
+                    locked_existing.site_id,
+                    current_user,
+                )
+                usage_id = locked_existing.usage_id
+                await query_db.rollback()
+                return cls._success(usage_id)
+
             if inventory.active_filling_id is None:
                 raise ServiceException(message='托盘不存在活动装填周期')
-            filling = await OperationDao.get_active_filling_for_update(
-                query_db,
-                inventory.active_filling_id,
-            )
             if filling is None:
                 raise ServiceException(message='托盘活动装填周期不存在或已关闭')