diff --git a/backend/src/main/java/com/designhub/entity/Notification.java b/backend/src/main/java/com/designhub/entity/Notification.java
index 0905c40..deef9ef 100644
--- a/backend/src/main/java/com/designhub/entity/Notification.java
+++ b/backend/src/main/java/com/designhub/entity/Notification.java
@@ -109,9 +109,9 @@ public class Notification implements Serializable {
     private LocalDateTime createTime;
 
     /**
-     * 更新时间
+     * 更新时间（表中不存在此字段，标记为不存在）
      */
-    @TableField(fill = FieldFill.INSERT_UPDATE)
+    @TableField(exist = false)
     private LocalDateTime updateTime;
 
     /**