diff --git a/app/db/__init__.py b/app/db/__init__.py
index e9807d33..cf7eda25 100644
--- a/app/db/__init__.py
+++ b/app/db/__init__.py
@@ -236,7 +236,6 @@ class DbOper:
     """
     数据库操作基类
     """
-    _db: Session = None
 
     def __init__(self, db: Session = None):
         self._db = db
diff --git a/app/db/models/__init__.py b/app/db/models/__init__.py
index 09ecf69f..933fcb49 100644
--- a/app/db/models/__init__.py
+++ b/app/db/models/__init__.py
@@ -9,3 +9,4 @@ from .transferhistory import TransferHistory
 from .user import User
 from .userconfig import UserConfig
 from .workflow import Workflow
+from .userrequest import UserRequest
diff --git a/app/db/systemconfig_oper.py b/app/db/systemconfig_oper.py
index 5d070a0e..6a6541df 100644
--- a/app/db/systemconfig_oper.py
+++ b/app/db/systemconfig_oper.py
@@ -8,14 +8,15 @@ from app.utils.singleton import Singleton
 
 
 class SystemConfigOper(DbOper, metaclass=Singleton):
-    # 配置对象
-    __SYSTEMCONF: dict = {}
-
+    """
+    系统配置管理
+    """
     def __init__(self):
         """
         加载配置到内存
         """
         super().__init__()
+        self.__SYSTEMCONF = {}
         for item in SystemConfig.list(self._db):
             self.__SYSTEMCONF[item.key] = item.value
 
diff --git a/app/db/userconfig_oper.py b/app/db/userconfig_oper.py
index b263f71c..4b4d4b15 100644
--- a/app/db/userconfig_oper.py
+++ b/app/db/userconfig_oper.py
@@ -7,14 +7,15 @@ from app.utils.singleton import Singleton
 
 
 class UserConfigOper(DbOper, metaclass=Singleton):
-    # 配置缓存
-    __USERCONF: Dict[str, Dict[str, Any]] = {}
-
+    """
+    用户配置管理
+    """
     def __init__(self):
         """
         加载配置到内存
         """
         super().__init__()
+        self.__USERCONF = {}
         for item in UserConfig.list(self._db):
             self.__set_config_cache(username=item.username, key=item.key, value=item.value)