src/main/java/com/campus/water/entity/Admin.java

@@ -26,7 +26,7 @@ public class Admin {
     private String phone;
 
     // 新增：管理员负责的区域ID（区域管理员专用）
-    @Column(name = "area_id", length = 20)
+    @Column(name = "area_id", length = 36)
     private String areaId;
 
     // 恢复三个角色枚举

src/main/java/com/campus/water/entity/Alert.java

@@ -31,7 +31,7 @@ public class Alert {
     @Column(name = "alert_message", columnDefinition = "TEXT")
     private String alertMessage;
 
-    @Column(name = "area_id", length = 20)
+    @Column(name = "area_id", length = 36)
     private String areaId;
 
     @Enumerated(EnumType.STRING)

src/main/java/com/campus/water/entity/Device.java

@@ -24,7 +24,7 @@ public class Device {
     @Column(name = "device_type", length = 50)
     private DeviceType deviceType;
 
-    @Column(name = "area_id", length = 20)
+    @Column(name = "area_id", length = 36)
     private String areaId;
 
     @Column(name = "install_location", length = 200)

src/main/java/com/campus/water/entity/Repairman.java

@@ -25,7 +25,7 @@ public class Repairman {
     @Column(length = 20)
     private String phone;
 
-    @Column(name = "area_id", length = 20)
+    @Column(name = "area_id", length = 36)
     private String areaId;
 
     @Column(name = "skills", length = 200)