优化项目结构，格式化代码

src/common/database/sqlalchemy_database_api.py

@@ -10,7 +10,7 @@ from typing import Dict, List, Any, Union, Type, Optional
 from contextlib import contextmanager
 from sqlalchemy.orm import Session
 from sqlalchemy.exc import SQLAlchemyError, DisconnectionError, OperationalError
-from sqlalchemy import desc, asc, func, and_, or_
+from sqlalchemy import desc, asc, func, and_
 from src.common.logger import get_logger
 from src.common.database.sqlalchemy_models import (
     Base, get_db_session, Messages, ActionRecords, PersonInfo, ChatStreams,
@@ -61,7 +61,7 @@ def get_db_session():
                 time.sleep(retry_delay * (attempt + 1))
             else:
                 raise
-        except Exception as e:
+        except Exception:
             if session:
                 session.rollback()
             raise

src/common/database/sqlalchemy_models.py

@@ -68,7 +68,7 @@ class SessionProxy:
                             # commit后不要清除session，只是刷新状态
                             pass  # 保持session活跃
                         return result
-                    except Exception as e:
+                    except Exception:
                         try:
                             if session and hasattr(session, 'rollback'):
                                 session.rollback()
@@ -555,7 +555,7 @@ def get_db_session():
         session = SessionLocal()
         yield session
         session.commit()
-    except Exception as e:
+    except Exception:
         if session:
             session.rollback()
         raise