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/app/analytics/health.py

@@ -0,0 +1,48 @@
+"""E0-lite 数据健康——「数据截至」角标 + 实体新鲜度。
+
+完整 E0(调度日志解析/成功率账本)二批;v1 用表新鲜度判定:
+msg_daily_stats 当日有行 = 4h 消息链路活着。
+"""
+from __future__ import annotations
+
+import datetime as dt
+
+import sqlalchemy as sa
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.db.models import (
+    ChatGroup,
+    Customer,
+    Media,
+    Message,
+    MomentsPost,
+    MsgDailyStats,
+    PhoneCall,
+)
+
+
+async def data_as_of(session: AsyncSession) -> int | None:
+    """数据截至(ms-epoch)= MAX(msg_daily_stats.last_ts)。"""
+    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 _max(col) -> dt.datetime | None:
+        return (await session.execute(sa.select(sa.func.max(col)))).scalar_one_or_none()
+
+    out = []
+    for name, col in (
+        ("customer", Customer.updated_at),
+        ("chat_group", ChatGroup.updated_at),
+        ("phone_call", PhoneCall.updated_at),
+        ("media", Media.updated_at),
+        ("moments_post", MomentsPost.updated_at),
+        ("message", Message.fetched_at),
+    ):
+        out.append({"table": name, "last_seen": await _max(col)})
+    return out