diff --git a/create_wps_form_table.sql b/create_wps_form_table.sql
index d95ae69..c63688c 100644
--- a/create_wps_form_table.sql
+++ b/create_wps_form_table.sql
@@ -21,7 +21,7 @@ CREATE TABLE IF NOT EXISTS wps_form_submissions (
     remarks TEXT COMMENT '备注内容',
     status VARCHAR(20) DEFAULT 'pending' COMMENT '状态',
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '记录创建时间',
-    updated_at TIMESTAMP DEFAULT '0000-00-00 00:00:00' ON UPDATE CURRENT_TIMESTAMP COMMENT '记录更新时间',
+    updated_at DATETIME NOT NULL COMMENT '记录更新时间',
     INDEX idx_rid (rid),
     INDEX idx_license_plate (license_plate),
     INDEX idx_date (date),
diff --git a/webhook.php b/webhook.php
index dc17a3f..2680c80 100644
--- a/webhook.php
+++ b/webhook.php
@@ -249,12 +249,12 @@ function store_form_data_to_db($form_data) {
             rid, form_id, form_title, creator_id, create_time, update_time, 
             mobile, name, license_plate, date, time_slot, car_type,
             has_car_coat, car_wash_habit, car_wash_experience, wash_frequency,
-            age_group, remarks, status
+            age_group, remarks, status, updated_at
         ) VALUES (
             :rid, :form_id, :form_title, :creator_id, :create_time, :update_time, 
             :mobile, :name, :license_plate, :date, :time_slot, :car_type,
             :has_car_coat, :car_wash_habit, :car_wash_experience, :wash_frequency,
-            :age_group, :remarks, :status
+            :age_group, :remarks, :status, :updated_at
         )";
         
         $stmt = $pdo->prepare($sql);
@@ -266,6 +266,7 @@ function store_form_data_to_db($form_data) {
         $stmt->bindValue(':creator_id', $form_data['creator_id']);
         $stmt->bindValue(':create_time', date('Y-m-d H:i:s'));
         $stmt->bindValue(':update_time', date('Y-m-d H:i:s'));
+        $stmt->bindValue(':updated_at', date('Y-m-d H:i:s'));
         
         // 绑定表单字段值（只绑定实际存在的字段）
         $stmt->bindValue(':mobile', isset($form_data['answers_by_title']['请输入手机号']) ? $form_data['answers_by_title']['请输入手机号'] : '');
@@ -337,7 +338,7 @@ function create_wps_form_table($pdo) {
             remarks TEXT COMMENT '备注内容',
             status VARCHAR(20) DEFAULT 'pending' COMMENT '状态',
             created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '记录创建时间',
-            updated_at TIMESTAMP DEFAULT '0000-00-00 00:00:00' ON UPDATE CURRENT_TIMESTAMP COMMENT '记录更新时间',
+            updated_at DATETIME NOT NULL COMMENT '记录更新时间',
             INDEX idx_rid (rid),
             INDEX idx_license_plate (license_plate),
             INDEX idx_date (date),