diff --git a/src/app.module.ts b/src/app.module.ts
index aac72a6..d707bb1 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -6,6 +6,7 @@ import { AppController } from './app.controller';
 import { AppService } from './app.service';
 import { LoggerModule } from './core/utils/logger/logger.module';
 import { UsersModule } from './core/db/users/users.module';
+import { ZulipAccountsModule } from './core/db/zulip_accounts/zulip_accounts.module';
 import { LoginCoreModule } from './core/login_core/login_core.module';
 import { AuthGatewayModule } from './gateway/auth/auth.gateway.module';
 import { ChatGatewayModule } from './gateway/chat/chat.gateway.module';
@@ -62,6 +63,8 @@ function isDatabaseConfigured(): boolean {
         database: process.env.DB_NAME,
         entities: [__dirname + '/**/*.entity{.ts,.js}'],
         synchronize: false,
+        // 字符集配置 - 支持中文和emoji
+        charset: 'utf8mb4',
         // 添加连接超时和重试配置
         connectTimeout: 10000,
         retryAttempts: 3,
@@ -70,6 +73,8 @@ function isDatabaseConfigured(): boolean {
     ] : []),
     // 根据数据库配置选择用户模块模式
     isDatabaseConfigured() ? UsersModule.forDatabase() : UsersModule.forMemory(),
+    // Zulip账号关联模块 - 全局单例，其他模块无需重复导入
+    ZulipAccountsModule.forRoot(),
     LoginCoreModule,
     AuthGatewayModule,  // 认证网关模块
     ChatGatewayModule,  // 聊天网关模块
diff --git a/src/business/admin/admin.module.ts b/src/business/admin/admin.module.ts
index c8b808d..2e9f02e 100644
--- a/src/business/admin/admin.module.ts
+++ b/src/business/admin/admin.module.ts
@@ -27,7 +27,6 @@ import { AdminCoreModule } from '../../core/admin_core/admin_core.module';
 import { LoggerModule } from '../../core/utils/logger/logger.module';
 import { UsersModule } from '../../core/db/users/users.module';
 import { UserProfilesModule } from '../../core/db/user_profiles/user_profiles.module';
-import { ZulipAccountsModule } from '../../core/db/zulip_accounts/zulip_accounts.module';
 import { AdminController } from './admin.controller';
 import { AdminService } from './admin.service';
 import { AdminDatabaseController } from './admin_database.controller';
@@ -55,8 +54,7 @@ function isDatabaseConfigured(): boolean {
     UsersModule,
     // 根据数据库配置选择UserProfiles模块模式
     isDatabaseConfigured() ? UserProfilesModule.forDatabase() : UserProfilesModule.forMemory(),
-    // 根据数据库配置选择ZulipAccounts模块模式
-    isDatabaseConfigured() ? ZulipAccountsModule.forDatabase() : ZulipAccountsModule.forMemory(),
+    // 注意：ZulipAccountsModule 是全局模块，已在 AppModule 中导入，无需重复导入
     // 注册AdminOperationLog实体
     TypeOrmModule.forFeature([AdminOperationLog])
   ],
diff --git a/src/business/auth/auth.module.ts b/src/business/auth/auth.module.ts
index 782b9f5..733e326 100644
--- a/src/business/auth/auth.module.ts
+++ b/src/business/auth/auth.module.ts
@@ -36,7 +36,6 @@ import { LoginService } from './login.service';
 import { RegisterService } from './register.service';
 import { LoginCoreModule } from '../../core/login_core/login_core.module';
 import { ZulipCoreModule } from '../../core/zulip_core/zulip_core.module';
-import { ZulipAccountsModule } from '../../core/db/zulip_accounts/zulip_accounts.module';
 import { UsersModule } from '../../core/db/users/users.module';
 
 @Module({
@@ -44,7 +43,7 @@ import { UsersModule } from '../../core/db/users/users.module';
     // 导入核心层模块
     LoginCoreModule,
     ZulipCoreModule,
-    ZulipAccountsModule.forRoot(),
+    // 注意：ZulipAccountsModule 是全局模块，已在 AppModule 中导入，无需重复导入
     UsersModule,
   ],
   providers: [
diff --git a/src/business/zulip/zulip.module.ts b/src/business/zulip/zulip.module.ts
index a5e9f3e..ceed582 100644
--- a/src/business/zulip/zulip.module.ts
+++ b/src/business/zulip/zulip.module.ts
@@ -36,7 +36,6 @@ import { ZulipEventProcessorService } from './services/zulip_event_processor.ser
 import { ZulipAccountsBusinessService } from './services/zulip_accounts_business.service';
 // 依赖模块
 import { ZulipCoreModule } from '../../core/zulip_core/zulip_core.module';
-import { ZulipAccountsModule } from '../../core/db/zulip_accounts/zulip_accounts.module';
 import { RedisModule } from '../../core/redis/redis.module';
 import { LoggerModule } from '../../core/utils/logger/logger.module';
 import { LoginCoreModule } from '../../core/login_core/login_core.module';
@@ -50,8 +49,7 @@ import { ChatModule } from '../chat/chat.module';
     CacheModule.register(),
     // Zulip核心服务模块
     ZulipCoreModule,
-    // Zulip账号关联模块
-    ZulipAccountsModule.forRoot(),
+    // 注意：ZulipAccountsModule 是全局模块，已在 AppModule 中导入，无需重复导入
     // Redis模块
     RedisModule,
     // 日志模块