feat: 增强数据库服务，添加类型转换以支持更灵活的查询

src/services/database_service.py

@@ -4,7 +4,7 @@ import json
 import time
 import traceback
 from datetime import datetime
-from typing import Any, Optional
+from typing import Any, Optional, cast
 
 from sqlalchemy import delete, func, select
 from sqlmodel import SQLModel
@@ -65,7 +65,7 @@ async def db_save(
             record = None
             if key_field and key_value is not None:
                 key_column = _get_model_field(model_class, key_field)
-                record = session.exec(select(model_class).where(key_column == key_value)).first()
+                record = session.exec(cast(Any, select(model_class).where(key_column == key_value))).first()
 
             if record is None:
                 record = model_class(**data)
@@ -99,7 +99,7 @@ async def db_get(
             statement = _apply_order_by(statement, model_class, order_by)
             if limit:
                 statement = statement.limit(limit)
-            results = session.exec(statement).all()
+            results = session.exec(cast(Any, statement)).all()
             data = [_to_dict(item) for item in results]
             if single_result:
                 return data[0] if data else None
@@ -116,7 +116,7 @@ async def db_update(model_class: type[SQLModel], data: dict[str, Any], filters:
             statement = select(model_class)
             if conditions := _build_filters(model_class, filters):
                 statement = statement.where(*conditions)
-            records = session.exec(statement).all()
+            records = session.exec(cast(Any, statement)).all()
             for record in records:
                 for field_name, value in data.items():
                     _get_model_field(model_class, field_name)
@@ -149,7 +149,7 @@ async def db_count(model_class: type[SQLModel], filters: Optional[dict[str, Any]
             statement = select(func.count()).select_from(model_class)
             if conditions := _build_filters(model_class, filters):
                 statement = statement.where(*conditions)
-            result = session.exec(statement).one()
+            result = session.exec(cast(Any, statement)).one()
             return int(result or 0)
     except Exception as e:
         logger.error(f"[DatabaseService] 统计数据库记录出错: {e}")