refactor: finish transactional runtime migration

app/db/models/mediaserver.py

@@ -7,7 +7,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import Mapped, Session, mapped_column
 
 from app.db.base import Base, execute_dml, get_id_column
-from app.db.decorators import async_db_query, db_query, db_update
+from app.db.decorators import async_db_query, db_query
 from app.db.models._constraints import media_identity_constraint
 from app.schemas.types import MediaSource
 
@@ -65,16 +65,16 @@ class MediaServerItem(Base):
         ).scalars().first()
 
     @classmethod
-    @db_update
     def empty(cls, db: Session, server: Optional[str] = None):
+        """在调用方事务中暂存媒体服务器条目清空操作。"""
         statement = delete(cls)
         if server is not None:
             statement = statement.where(cls.server == server)
         db.execute(statement, execution_options={"synchronize_session": False})
 
     @classmethod
-    @db_update
     def delete_stale(cls, db: Session, server: str, sync_time: str):
+        """在调用方事务中删除本轮同步未更新的条目。"""
         return execute_dml(
             db,
             delete(cls).where(
@@ -85,8 +85,8 @@ class MediaServerItem(Base):
         )
 
     @classmethod
-    @db_update
     def delete_excluded_servers(cls, db: Session, servers: List[str]):
+        """在调用方事务中删除不属于启用服务器的条目。"""
         statement = delete(cls)
         if servers:
             statement = statement.where(