暂存，逻辑是否应该转成实体在去进行业务判断

lib/app/core/models/sync_status.dart

@@ -62,6 +62,6 @@ extension SyncStatusExtension on SyncStatus {
 abstract class SyncableEntity {
   String get id;
   SyncStatus get syncStatus;
-  DateTime get lastModifiedTime;
+  DateTime? get lastModifiedTime;
-  String get lastModifierId;
+  String? get lastModifierId;
 }

lib/app/features/enterprise/data/repositories_impl/enterprise_repository_impl.dart

@@ -108,7 +108,6 @@ class EnterpriseRepositoryImpl implements EnterpriseRepository {
     return syncedDto.toModel().toEntity();
   }
 
-  // todo  ********************************应该修改这个地方了******************************************
   @override
   Future<void> updateEnterpriseSyncStatus(
     String enterpriseId,

lib/app/features/problem/domain/entities/problem_entity.dart

@@ -0,0 +1,24 @@
+import 'package:problem_check_system/app/core/models/sync_status.dart';
+
+class ProblemEntity implements SyncableEntity {
+  // 1. 将 getter 实现替换为 final 字段
+  @override
+  final String id;
+
+  @override
+  final DateTime? lastModifiedTime;
+
+  @override
+  final String? lastModifierId;
+
+  @override
+  final SyncStatus syncStatus;
+
+  // 2. 在构造函数中初始化这些字段
+  ProblemEntity({
+    required this.id,
+    this.lastModifiedTime,
+    this.lastModifierId,
+    this.syncStatus = SyncStatus.pendingCreate,
+  });
+}