业务更新User所需（企业成员、聊天室群组成员）

apps/im_app/lib/app/di/user_provider.dart

@@ -1,5 +1,7 @@
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:im_app/domain/usecases/insert_users_use_case.dart';
+import 'package:im_app/features/chat/usecases/delete_users_use_case.dart';
+import 'package:im_app/features/chat/usecases/insert_users_use_case.dart';
+import 'package:im_app/features/chat/usecases/update_users_use_case.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:im_app/app/di/db_provider.dart';
 import 'package:im_app/data/repositories/user_repository_impl.dart';
@@ -24,6 +26,20 @@ final insertUsersUseCaseProvider = Provider<InsertUsersUseCase>((ref) {
   return InsertUsersUseCase(userRepository: ref.read(userRepositoryProvider));
 });
 
+/// 批量更新用户用例 Provider
+///
+/// 取前10条，随机生成昵称，批量更新到 DB
+final updateUsersUseCaseProvider = Provider<UpdateUsersUseCase>((ref) {
+  return UpdateUsersUseCase(userRepository: ref.read(userRepositoryProvider));
+});
+
+/// 删除前10个用户用例 Provider
+///
+/// 取前10条，按 uid 逐条删除
+final deleteUsersUseCaseProvider = Provider<DeleteUsersUseCase>((ref) {
+  return DeleteUsersUseCase(userRepository: ref.read(userRepositoryProvider));
+});
+
 // ── Streams ───────────────────────────────────────────────────────────────────
 
 @riverpod

apps/im_app/lib/app/notifiers/user_notifier.dart

@@ -1,6 +1,5 @@
 import 'package:im_app/app/di/user_provider.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
-import 'package:im_app/data/local/drift/app_database.dart';
 import 'package:im_app/domain/entities/user.dart';
 import 'package:im_app/domain/repositories/user_repository.dart';
 
@@ -16,10 +15,16 @@ part 'user_notifier.g.dart';
 /// // 即时读取，无需 await
 /// final user = ref.read(userNotifierProvider(123).notifier).current;
 ///
-/// // 部分更新
-/// ref.read(userNotifierProvider(123).notifier).updateFields(
-///   UsersCompanion(nickname: Value('New Name')),
+/// // 插入或替换
+/// ref.read(userNotifierProvider(123).notifier).insertOrReplaceUser(user);
+///
+/// // 单个更新
+/// ref.read(userNotifierProvider(123).notifier).updateUser(
+///   user.copyWith(nickname: 'New Name'),
 /// );
+///
+/// // 批量更新
+/// ref.read(userNotifierProvider(123).notifier).updateUsers(updatedList);
 /// ```
 @riverpod
 class UserNotifier extends _$UserNotifier {
@@ -31,13 +36,11 @@ class UserNotifier extends _$UserNotifier {
   Future<User?> build(int uid) async {
     ref.onDispose(() => _cached = null);
 
-    // Stream starts automatically — uid is the family arg
     _repo.watchUser(uid).listen((user) {
       _cached = user;
       state = AsyncData(user);
     });
 
-    // Return initial DB value
     return _repo.getUser(uid);
   }
 
@@ -47,16 +50,31 @@ class UserNotifier extends _$UserNotifier {
 
   // ── 写入 ─────────────────────────────────────────────────────────────────
 
-  Future<void> saveUser(User user) async {
-    await _repo.saveUser(user);
-  }
-
-  Future<void> updateFields(UsersCompanion companion) async {
-    await _repo.updateFields(uid, companion); // uid from build arg
+  /// 插入或替换单个用户
+  Future<void> insertOrReplaceUser(User user) async {
+    await _repo.insertOrReplaceUser(user);
   }
 
+  /// 更新单个用户所有字段，按 uid 匹配
+  ///
+  /// 示例：
+  /// ```dart
+  /// await notifier.updateUser(user.copyWith(nickname: 'New Name'));
+  /// ```
   Future<void> updateUser(User user) async {
-    await _repo.saveUser(user);
+    await _repo.updateUser(user);
+  }
+
+  /// 批量更新用户，每条按 uid 匹配更新所有字段
+  ///
+  /// 示例：
+  /// ```dart
+  /// await notifier.updateUsers(
+  ///   users.map((u) => u.copyWith(nickname: 'new')).toList(),
+  /// );
+  /// ```
+  Future<void> updateUsers(List<User> users) async {
+    await _repo.updateUsersBatch(users);
   }
 
   // ── 删除 ─────────────────────────────────────────────────────────────────