diff --git a/docs/MVP-WorkOrders.md b/docs/MVP-WorkOrders.md
index d0d2160..7fa9b45 100644
--- a/docs/MVP-WorkOrders.md
+++ b/docs/MVP-WorkOrders.md
@@ -978,6 +978,26 @@ fix: 修复页面刷新和按钮点击的 500 错误
 
 - 用户需要提供或复现最容易触发 500 的页面 URL 与按钮名称；如果无法提供，则开发时先从当前浏览器打开的任务详情页开始排查。
 
+完成记录：
+
+- 完成日期：2026-07-03
+- 相关改动：
+  - 补充路由回归测试，覆盖任务详情页、热点报告页、内容详情页、导出接口在数据库 I/O error 下的 503 兜底。
+  - 补充缺失任务、缺失热点、缺失内容页面的 404 兜底测试，确保不是裸 500。
+  - 核查当前实现已有 `OperationalError` / `SQLAlchemyError` 全局 handler：API 返回 503 JSON，HTML 页面返回数据库不可用友好页。
+- 验证命令：
+  - `docker cp tests/. hot-comments-tool-app-1:/app/tests/`
+  - `docker exec hot-comments-tool-app-1 sh -lc 'python -m pytest /app/tests/integration/test_routes.py -q'`
+- 验证结果：
+  - `19 passed, 1 warning`
+- 验收结论：
+  - 已知高频页面路由和导出入口在数据库 I/O error 下不会返回裸 `Internal Server Error`。
+  - 缺失任务、热点、内容不会返回 500。
+  - 服务端日志仍保留异常信息，页面/API 返回可理解错误。
+- 遗留问题：
+  - 轮询接口偶发 503 时，前端当前只是静默返回，用户看不到“最近一次同步失败”提示；归入 WO-19 / WO-13 前端提示优化。
+  - 当前本机 Python `.venv` 仍未完成依赖安装，本轮测试通过运行容器执行。
+
 ### WO-12 导出 Markdown / CSV 点击失效修复
 
 优先级：P0
diff --git a/tests/integration/test_routes.py b/tests/integration/test_routes.py
index 8d599d3..c892da6 100644
--- a/tests/integration/test_routes.py
+++ b/tests/integration/test_routes.py
@@ -384,6 +384,102 @@ def test_index_page_shows_database_error_state_when_database_has_io_error(monkey
     assert "请先保留 data 目录" in response.text
 
 
+def test_task_detail_page_shows_database_error_state_when_database_has_io_error(monkeypatch):
+    def broken_get_task(_session, _task_id):
+        raise OperationalError("SELECT 1", {}, Exception("disk I/O error"))
+
+    monkeypatch.setattr("app.main.get_task", broken_get_task)
+
+    with make_test_client() as (client, _engine):
+        response = client.get("/tasks/task-io-error")
+
+    assert response.status_code == 503
+    assert "数据库暂时不可用" in response.text
+    assert "请先保留 data 目录" in response.text
+
+
+def test_hotspot_report_page_shows_database_error_state_when_database_has_io_error(monkeypatch):
+    def broken_get_task(_session, _task_id):
+        raise OperationalError("SELECT 1", {}, Exception("disk I/O error"))
+
+    monkeypatch.setattr("app.main.get_task", broken_get_task)
+
+    with make_test_client() as (client, engine):
+        from sqlalchemy.orm import Session
+
+        with Session(engine) as session:
+            session.add(Task(id="task-hot-io", platform="xiaohongshu", status="success"))
+            session.add(Hotspot(id="hot-io", task_id="task-hot-io", platform="xiaohongshu", title="热点", rank=1, raw_data="{}"))
+            session.commit()
+
+        response = client.get("/hotspots/hot-io/report")
+
+    assert response.status_code == 503
+    assert "数据库暂时不可用" in response.text
+
+
+def test_item_detail_page_shows_database_error_state_when_database_has_io_error(monkeypatch):
+    def broken_get_task(_session, _task_id):
+        raise OperationalError("SELECT 1", {}, Exception("disk I/O error"))
+
+    monkeypatch.setattr("app.main.get_task", broken_get_task)
+
+    with make_test_client() as (client, engine):
+        from sqlalchemy.orm import Session
+
+        with Session(engine) as session:
+            session.add(Task(id="task-item-io", platform="xiaohongshu", status="success"))
+            session.add(Hotspot(id="hot-item-io", task_id="task-item-io", platform="xiaohongshu", title="热点", rank=1, raw_data="{}"))
+            session.add(
+                ContentItem(
+                    id="item-io",
+                    task_id="task-item-io",
+                    hotspot_id="hot-item-io",
+                    platform="xiaohongshu",
+                    source_item_id="item-io-source",
+                    item_type="note",
+                    status="success",
+                    raw_data="{}",
+                )
+            )
+            session.commit()
+
+        response = client.get("/items/item-io")
+
+    assert response.status_code == 503
+    assert "数据库暂时不可用" in response.text
+
+
+def test_export_route_returns_service_unavailable_when_database_has_io_error(monkeypatch):
+    def broken_export(_session, _item_id):
+        raise OperationalError("SELECT 1", {}, Exception("disk I/O error"))
+
+    monkeypatch.setattr("app.main.export_item_comments_csv", broken_export)
+
+    with make_test_client() as (client, _engine):
+        response = client.get("/api/export/items/item-io/comments.csv")
+
+    assert response.status_code == 503
+    assert response.json()["detail"] == "数据库暂时不可用，请稍后重试或联系维护者恢复数据。"
+
+
+def test_missing_html_pages_render_friendly_not_found_page():
+    with make_test_client() as (client, _engine):
+        task_response = client.get("/tasks/missing-task")
+        hotspot_response = client.get("/hotspots/missing-hotspot/report")
+        item_response = client.get("/items/missing-item")
+
+    assert task_response.status_code == 404
+    assert "任务不存在" in task_response.text
+    assert "Internal Server Error" not in task_response.text
+    assert hotspot_response.status_code == 404
+    assert "热点不存在" in hotspot_response.text
+    assert "Internal Server Error" not in hotspot_response.text
+    assert item_response.status_code == 404
+    assert "内容条目不存在" in item_response.text
+    assert "Internal Server Error" not in item_response.text
+
+
 def test_task_api_includes_progress_counts_stage_and_demo_flag():
     with make_test_client() as (client, engine):
         seed_result_data(engine)