diff --git a/carwash_db.sql b/carwash_db.sql
index 57e7259..5ce2200 100644
--- a/carwash_db.sql
+++ b/carwash_db.sql
@@ -12,7 +12,7 @@ CREATE TABLE IF NOT EXISTS packages (
     services TEXT NOT NULL COMMENT '包含的服务项目(用逗号分隔)',
     is_active BOOLEAN DEFAULT TRUE,
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+    updated_at TIMESTAMP NULL
 );
 
 -- 修改预约表支持时间段
@@ -32,7 +32,7 @@ CREATE TABLE IF NOT EXISTS bookings (
     notes TEXT,
     status ENUM('待确认', '已确认', '进行中', '已完成', '已取消') DEFAULT '待确认',
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NULL,
     FOREIGN KEY (package_id) REFERENCES packages(id) ON DELETE SET NULL
 );