修复：强化库存事务并发与日期边界

shierfeng-fastapi-backend/module_business/dao/inventory_dao.py

@@ -1,4 +1,4 @@
-from sqlalchemy import func, select
+from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from module_business.entity.do.master_do import BizPallet
@@ -15,7 +15,10 @@ class InventoryDao:
         pallet_id: int,
     ) -> BizPalletInventory | None:
         result = await db.execute(
-            select(BizPalletInventory).where(BizPalletInventory.pallet_id == pallet_id).with_for_update()
+            select(BizPalletInventory)
+            .where(BizPalletInventory.pallet_id == pallet_id)
+            .with_for_update()
+            .execution_options(populate_existing=True)
         )
         return result.scalar_one_or_none()
 
@@ -34,6 +37,7 @@ class InventoryDao:
             .where(BizPalletInventory.pallet_id.in_(ordered_ids))
             .order_by(BizPalletInventory.pallet_id)
             .with_for_update()
+            .execution_options(populate_existing=True)
         )
         return sorted(result.scalars().all(), key=lambda inventory: inventory.pallet_id)
 
@@ -62,6 +66,7 @@ class InventoryDao:
             .where(BizPallet.pallet_id.in_(ordered_ids))
             .order_by(BizPallet.pallet_id)
             .with_for_update()
+            .execution_options(populate_existing=True)
         )
         return sorted(result.scalars().all(), key=lambda pallet: pallet.pallet_id)
 
@@ -89,9 +94,13 @@ class InventoryDao:
     ) -> BizPalletEvent:
         """在调用方持有库存行锁时，为托盘追加下一序号事件。"""
         sequence_result = await db.execute(
-            select(func.max(BizPalletEvent.event_seq)).where(BizPalletEvent.pallet_id == inventory.pallet_id)
+            select(BizPalletEvent.event_seq)
+            .where(BizPalletEvent.pallet_id == inventory.pallet_id)
+            .order_by(BizPalletEvent.event_seq.desc())
+            .limit(1)
+            .with_for_update()
         )
-        last_sequence = sequence_result.scalar_one()
+        last_sequence = sequence_result.scalar_one_or_none()
         event.pallet_id = inventory.pallet_id
         event.event_seq = (last_sequence or 0) + 1
         db.add(event)