功能：增加旧测试数据闭包纳入

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

@@ -149,8 +149,39 @@ class TestBatchDao:
     async def count_owned_rows(cls, db: AsyncSession, batch_id: int) -> dict[str, int]:
         counts: dict[str, int] = {}
         for model in _BATCH_OWNED_MODELS:
-            result = await db.execute(
-                select(func.count()).select_from(model).where(model.test_batch_id == batch_id)
-            )
+            result = await db.execute(select(func.count()).select_from(model).where(model.test_batch_id == batch_id))
             counts[model.__tablename__] = result.scalar() or 0
         return counts
+
+    @classmethod
+    async def store_preview(
+        cls,
+        db: AsyncSession,
+        batch: BizTestBatch,
+        *,
+        action: str,
+        token_hash: str,
+        scope_hash: str,
+        expires_at: datetime,
+        update_by: str,
+        update_time: datetime,
+    ) -> None:
+        """在已锁定的批次对象上保存一次性预览状态。"""
+        batch.preview_action = action
+        batch.preview_token_hash = token_hash
+        batch.preview_scope_hash = scope_hash
+        batch.preview_expires_at = expires_at
+        batch.update_by = update_by
+        batch.update_time = update_time
+
+    @classmethod
+    async def clear_preview(
+        cls,
+        db: AsyncSession,
+        batch: BizTestBatch,
+    ) -> None:
+        """消费已锁定批次上的预览令牌与范围摘要。"""
+        batch.preview_action = None
+        batch.preview_token_hash = None
+        batch.preview_scope_hash = None
+        batch.preview_expires_at = None