diff --git a/yunke-server/app/analytics/health.py b/yunke-server/app/analytics/health.py
index c304008..91266ec 100644
--- a/yunke-server/app/analytics/health.py
+++ b/yunke-server/app/analytics/health.py
@@ -6,6 +6,7 @@ msg_daily_stats 当日有行 = 4h 消息链路活着。
 from __future__ import annotations
 
 import datetime as dt
+from typing import Any
 
 import sqlalchemy as sa
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -22,15 +23,23 @@ from app.db.models import (
 
 
 async def data_as_of(session: AsyncSession) -> int | None:
-    """数据截至(ms-epoch)= MAX(msg_daily_stats.last_ts)。"""
+    """数据截至(ms-epoch)= MAX(msg_daily_stats.last_ts)。
+
+    漏迁移导致表缺失时按 500 响亮报错是有意的——本模块是诊断端点,
+    要暴露部署问题而非掩盖(0ade58a 的空表静默守卫是业务端点的容错,
+    别好心搬到这里)。
+    """
     val = (
         await session.execute(sa.select(sa.func.max(MsgDailyStats.last_ts)))
     ).scalar_one_or_none()
     return int(val) if val is not None else None
 
 
-async def entity_freshness(session: AsyncSession) -> list[dict]:
-    """各实体最后更新时间(UPDATED_AT 列 MAX;message 用 fetched_at)。"""
+async def entity_freshness(session: AsyncSession) -> list[dict[str, Any]]:
+    """各实体最后更新时间(UPDATED_AT 列 MAX;message 用 fetched_at)。
+
+    同 data_as_of:表缺失按 500 响亮报错是有意的(诊断端点不容错)。
+    """
 
     async def _max(col) -> dt.datetime | None:
         return (await session.execute(sa.select(sa.func.max(col)))).scalar_one_or_none()
diff --git a/yunke-server/tests/test_analytics_api.py b/yunke-server/tests/test_analytics_api.py
index 0779716..24e2826 100644
--- a/yunke-server/tests/test_analytics_api.py
+++ b/yunke-server/tests/test_analytics_api.py
@@ -1,7 +1,12 @@
 """/api/analytics/health:E0-lite 冒烟。"""
 from __future__ import annotations
 
-from app.db.models import MsgDailyStats
+import datetime as dt
+
+from app.db.models import Customer, MsgDailyStats
+
+# naive:updated_at 列是无时区 DateTime;fromisoformat 构造不触发 DTZ 检查
+_SEEN = "2026-09-04T12:00:00"
 
 
 async def test_health_empty(make_client):
@@ -13,7 +18,8 @@ async def test_health_empty(make_client):
     assert r.status_code == 200
     body = r.json()
     assert body["data_as_of"] is None
-    assert any(e["table"] == "message" for e in body["entities"])
+    assert len(body["entities"]) == 6
+    assert all(e["last_seen"] is None for e in body["entities"])
 
 
 async def test_health_with_stats(make_client):
@@ -31,9 +37,21 @@ async def test_health_with_stats(make_client):
                 last_is_send=False,
             )
         )
+        session.add(
+            Customer(
+                friend_id="f1",
+                channel="wechat",
+                updated_at=dt.datetime.fromisoformat(_SEEN),
+            )
+        )
         await session.commit()
 
     client = await make_client(seed)
     r = await client.get("/api/analytics/health")
     assert r.status_code == 200
     assert r.json()["data_as_of"] == 1756900000000
+    entities = {e["table"]: e["last_seen"] for e in r.json()["entities"]}
+    # 前端契约:last_seen 必须是 ISO 字符串(fromisoformat 可解析)
+    assert dt.datetime.fromisoformat(entities["customer"]) == dt.datetime.fromisoformat(
+        _SEEN
+    )