diff --git a/AGENTS.md b/AGENTS.md
index e6446a2b..e3bcc2d8 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -46,7 +46,7 @@
 ```
 DFApp/                          ← 仓库根目录
 ├── AGENTS.md                   ← 本文件
-├── DFApp.Web/                  ← 后端项目
+├── src/DFApp.Web/              ← 后端项目
 ├── DFApp.LotteryProxy/         ← 彩票代理服务
 ├── test/DFApp.Web.Tests/       ← 单元测试
 ├── client/                     ← 前端项目（Vue 3）
@@ -55,7 +55,7 @@ DFApp/                          ← 仓库根目录
 ```
 
 ### 后端结构（轻量级单体架构）
-- `DFApp.Web/` ← 唯一后端项目
+- `src/DFApp.Web/` ← 唯一后端项目
   - `Domain/` - 实体和自定义基类
   - `Services/` - 应用服务
   - `Controllers/` - API 控制器（路由模式：`/api/app/{kebab-case-entity}`）
diff --git a/sql/16-add-missing-concurrency-stamp.sql b/sql/16-add-missing-concurrency-stamp.sql
new file mode 100644
index 00000000..3dee3699
--- /dev/null
+++ b/sql/16-add-missing-concurrency-stamp.sql
@@ -0,0 +1,81 @@
+-- =============================================================
+-- 为缺失 ConcurrencyStamp 列的表补充该列
+-- 幂等安全版：可安全地重复执行
+--
+-- 说明：
+--   AppRssWordSegment、AppRssSubscriptionDownloads、AppMediaExternalLinkMediaIds
+--   三个表的对应实体（RssWordSegment、RssSubscriptionDownload、
+--   MediaExternalLinkMediaIds）继承自 EntityBase<long>，后者定义了
+--   ConcurrencyStamp 列，但建表时遗漏了该列，导致查询时报错：
+--   "no such column: ConcurrencyStamp"
+--
+-- 幂等性原理：
+--   SQLite 不支持 ALTER TABLE ADD COLUMN IF NOT EXISTS 语法，
+--   通过 pragma_table_info 检查列是否存在，仅对缺失的列生成
+--   ALTER TABLE 语句，使用 .output 重定向 + .read 执行的方式。
+-- =============================================================
+
+.bail on
+.headers off
+
+-- ============================================================
+-- 第一部分：检查当前状态
+-- ============================================================
+
+SELECT '=== ConcurrencyStamp 列迁移前状态检查 ===';
+
+SELECT 'AppRssWordSegment:' ||
+    CASE WHEN (SELECT COUNT(*) FROM pragma_table_info('AppRssWordSegment') WHERE name = 'ConcurrencyStamp') > 0 THEN ' 已存在' ELSE ' 缺失' END;
+
+SELECT 'AppRssSubscriptionDownloads:' ||
+    CASE WHEN (SELECT COUNT(*) FROM pragma_table_info('AppRssSubscriptionDownloads') WHERE name = 'ConcurrencyStamp') > 0 THEN ' 已存在' ELSE ' 缺失' END;
+
+SELECT 'AppMediaExternalLinkMediaIds:' ||
+    CASE WHEN (SELECT COUNT(*) FROM pragma_table_info('AppMediaExternalLinkMediaIds') WHERE name = 'ConcurrencyStamp') > 0 THEN ' 已存在' ELSE ' 缺失' END;
+
+
+-- ============================================================
+-- 第二部分：动态生成并执行 ALTER TABLE 语句
+-- 仅对不存在的列生成 ALTER TABLE，已存在的列自动跳过
+-- ============================================================
+
+.output /tmp/_migration_16_steps.sql
+
+-- AppRssWordSegment（RssWordSegment : CreationAuditedEntity<long> → EntityBase<long>）
+SELECT 'ALTER TABLE "AppRssWordSegment" ADD COLUMN "ConcurrencyStamp" TEXT NOT NULL DEFAULT '''';'
+WHERE (SELECT COUNT(*) FROM pragma_table_info('AppRssWordSegment') WHERE name = 'ConcurrencyStamp') = 0;
+
+-- AppRssSubscriptionDownloads（RssSubscriptionDownload : CreationAuditedEntity<long> → EntityBase<long>）
+SELECT 'ALTER TABLE "AppRssSubscriptionDownloads" ADD COLUMN "ConcurrencyStamp" TEXT NOT NULL DEFAULT '''';'
+WHERE (SELECT COUNT(*) FROM pragma_table_info('AppRssSubscriptionDownloads') WHERE name = 'ConcurrencyStamp') = 0;
+
+-- AppMediaExternalLinkMediaIds（MediaExternalLinkMediaIds : EntityBase<long>）
+SELECT 'ALTER TABLE "AppMediaExternalLinkMediaIds" ADD COLUMN "ConcurrencyStamp" TEXT NOT NULL DEFAULT '''';'
+WHERE (SELECT COUNT(*) FROM pragma_table_info('AppMediaExternalLinkMediaIds') WHERE name = 'ConcurrencyStamp') = 0;
+
+.output stdout
+
+-- 执行动态生成的 ALTER TABLE 语句
+-- 如果所有列都已存在，临时文件为空，.read 不会执行任何操作
+.read /tmp/_migration_16_steps.sql
+
+-- 清理临时文件
+.shell rm -f /tmp/_migration_16_steps.sql
+
+
+-- ============================================================
+-- 第三部分：迁移后验证
+-- ============================================================
+
+SELECT '=== 迁移后验证 ===';
+
+SELECT 'AppRssWordSegment:' ||
+    CASE WHEN (SELECT COUNT(*) FROM pragma_table_info('AppRssWordSegment') WHERE name = 'ConcurrencyStamp') > 0 THEN ' ✅ConcurrencyStamp' ELSE ' ❌ConcurrencyStamp缺失' END;
+
+SELECT 'AppRssSubscriptionDownloads:' ||
+    CASE WHEN (SELECT COUNT(*) FROM pragma_table_info('AppRssSubscriptionDownloads') WHERE name = 'ConcurrencyStamp') > 0 THEN ' ✅ConcurrencyStamp' ELSE ' ❌ConcurrencyStamp缺失' END;
+
+SELECT 'AppMediaExternalLinkMediaIds:' ||
+    CASE WHEN (SELECT COUNT(*) FROM pragma_table_info('AppMediaExternalLinkMediaIds') WHERE name = 'ConcurrencyStamp') > 0 THEN ' ✅ConcurrencyStamp' ELSE ' ❌ConcurrencyStamp缺失' END;
+
+SELECT '✅ ConcurrencyStamp 列迁移完成（幂等安全，可重复执行）';
diff --git a/src/DFApp.Web/Controllers/ExternalLinkController.cs b/src/DFApp.Web/Controllers/ExternalLinkController.cs
index 37469d5f..2cb14468 100644
--- a/src/DFApp.Web/Controllers/ExternalLinkController.cs
+++ b/src/DFApp.Web/Controllers/ExternalLinkController.cs
@@ -56,6 +56,17 @@ public async Task<IActionResult> GetAsync([FromRoute] long id)
         return Success(result);
     }
 
+    /// <summary>
+    /// 生成外链（后台任务）
+    /// </summary>
+    [HttpGet("external-link")]
+    [Permission(DFAppPermissions.Medias.Create)]
+    public async Task<IActionResult> GetExternalLinkAsync()
+    {
+        var result = await _externalLinkService.GetExternalLink();
+        return Success(result);
+    }
+
     /// <summary>
     /// 分页获取外链列表
     /// </summary>
diff --git a/src/DFApp.Web/Program.cs b/src/DFApp.Web/Program.cs
index 7530dfd4..1e626bec 100644
--- a/src/DFApp.Web/Program.cs
+++ b/src/DFApp.Web/Program.cs
@@ -87,6 +87,7 @@ public async static Task<int> Main(string[] args)
 
             // 注册密码哈希服务（无状态，使用 Transient）
             builder.Services.AddTransient<IPasswordHasher, PasswordHasher>();
+            builder.Services.AddTransient<DFApp.Web.Mapping.LotteryMapper>();
 
             // 注册油价刷新器（无状态，使用 Transient）
             builder.Services.AddTransient<GasolinePriceRefresher>();
@@ -232,7 +233,7 @@ public async static Task<int> Main(string[] args)
                 });
             });
 
-            Quartz.Logging.LogProvider.IsDisabled = true;
+            // Quartz.Logging.LogProvider.IsDisabled = true;
             builder.Services.AddQuartz(q =>
             {
                 // GasolinePriceRefreshJob — 每晚21:00执行