feat(analytics): E0-lite 数据健康端点——数据截至+实体新鲜度

Co-Authored-By: Claude Code <noreply@anthropic.com>

yunke-server/tests/test_analytics_api.py

@@ -0,0 +1,39 @@
+"""/api/analytics/health:E0-lite 冒烟。"""
+from __future__ import annotations
+
+from app.db.models import MsgDailyStats
+
+
+async def test_health_empty(make_client):
+    async def seed(session):
+        ...
+
+    client = await make_client(seed)
+    r = await client.get("/api/analytics/health")
+    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"])
+
+
+async def test_health_with_stats(make_client):
+    async def seed(session):
+        session.add(
+            MsgDailyStats(
+                channel="wechat",
+                owner_account_id="wx1",
+                peer_kind="friend",
+                peer_id="t1",
+                day=20260904,
+                send_cnt=1,
+                recv_cnt=2,
+                last_ts=1756900000000,
+                last_is_send=False,
+            )
+        )
+        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