diff --git a/app/database.py b/app/database.py
index 1f161b5..a9dff38 100644
--- a/app/database.py
+++ b/app/database.py
@@ -1,3 +1,4 @@
+from datetime import datetime
 from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
 from sqlalchemy.orm import DeclarativeBase
 from sqlalchemy import Column, String, Integer, DateTime, Text, JSON, Index, text
@@ -14,7 +15,7 @@ class Base(DeclarativeBase):
 
 class CallbackFailureLog(Base):
     __tablename__ = "callback_failure_logs"
-    
+
     id = Column(Integer, primary_key=True, autoincrement=True, comment="日志ID")
     site_id = Column(String(100), nullable=False, comment="站点ID")  # 新增siteId字段
     remote_address = Column(String(45), nullable=True, comment="客户端IP地址")
@@ -22,12 +23,12 @@ class CallbackFailureLog(Base):
     request_url = Column(String(500), nullable=False, comment="请求URL")
     request_headers = Column(JSON, nullable=False, comment="请求头")
     request_body = Column(JSON, nullable=False, comment="请求体")
-    created_at = Column(DateTime, server_default=func.now(), comment="创建时间")
+    created_at = Column(DateTime, default=datetime.now(), comment="创建时间")
 
 
 class CallbackFailureData(Base):
     __tablename__ = "callback_failure_data"
-    
+
     id = Column(Integer, primary_key=True, autoincrement=True, comment="数据ID")
     callback_failure_log_id = Column(Integer, nullable=False, comment="回调失败日志ID")
     phone_number = Column(String(20), nullable=False, comment="手机号")
@@ -36,12 +37,12 @@ class CallbackFailureData(Base):
     status_description = Column(String(200), nullable=False, comment="状态描述")
     raw_data = Column(Text, nullable=False, comment="原始回调数据JSON字符串")
     calldate = Column(DateTime, nullable=True, comment="通话日期")
-    created_at = Column(DateTime, server_default=func.now(), comment="创建时间")
+    created_at = Column(DateTime, default=datetime.now(), comment="创建时间")
 
 
 class ExternalApiLog(Base):
     __tablename__ = "external_api_logs"  # 重命名表，更通用
-    
+
     id = Column(Integer, primary_key=True, autoincrement=True, comment="日志ID")
     callback_failure_log_id = Column(Integer, nullable=False, comment="回调失败日志ID")
     request_url = Column(String(500), nullable=False, comment="外部接口请求URL")
@@ -51,21 +52,15 @@ class ExternalApiLog(Base):
     response_headers = Column(JSON, nullable=False, comment="外部接口响应头")
     response_body = Column(Text, nullable=False, comment="外部接口响应体")
     retry_count = Column(Integer, default=0, comment="重试次数")
-    created_at = Column(DateTime, server_default=func.now(), comment="创建时间")
+    created_at = Column(DateTime, default=datetime.now(), comment="创建时间")
 
 
 # 创建数据库引擎
-engine = create_async_engine(
-    settings.database_url,
-    echo=settings.debug,
-    future=True
-)
+engine = create_async_engine(settings.database_url, echo=settings.debug, future=True)
 
 # 创建会话工厂
 AsyncSessionLocal = async_sessionmaker(
-    engine,
-    class_=AsyncSession,
-    expire_on_commit=False
+    engine, class_=AsyncSession, expire_on_commit=False
 )
 
 
@@ -82,14 +77,18 @@ async def init_db():
     try:
         async with engine.begin() as conn:
             await conn.run_sync(Base.metadata.create_all)
-            
+
             # 检查并创建手机号索引
-            await conn.execute(text("""
+            await conn.execute(
+                text(
+                    """
                 CREATE INDEX IF NOT EXISTS idx_phone_number 
                 ON callback_failure_data (phone_number)
-            """))
-            
+            """
+                )
+            )
+
         logger.info("✅ 数据库表结构初始化完成")
     except Exception as e:
         logger.error(f"❌ 数据库初始化失败: {e}")
-        raise
\ No newline at end of file
+        raise