diff --git a/yunke-server/app/analytics/__init__.py b/yunke-server/app/analytics/__init__.py
new file mode 100644
index 0000000..d4800ef
--- /dev/null
+++ b/yunke-server/app/analytics/__init__.py
@@ -0,0 +1,5 @@
+"""分析服务层——所有数据分析指标的口径收敛处(spec 2026-09-04 §2)。
+
+指标函数是纯查询(只依赖 AsyncSession,无 HTTP/请求上下文),E2 报表订阅
+(二批)直接复用。口径速查表:spec §8;函数 docstring 与之同步。
+"""
diff --git a/yunke-server/app/analytics/health.py b/yunke-server/app/analytics/health.py
new file mode 100644
index 0000000..c304008
--- /dev/null
+++ b/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
diff --git a/yunke-server/app/api/main.py b/yunke-server/app/api/main.py
index 0a24e6b..6971bb3 100644
--- a/yunke-server/app/api/main.py
+++ b/yunke-server/app/api/main.py
@@ -21,6 +21,7 @@ Includes:
 * ``GET /api/search`` (see :mod:`app.api.routers.search`).
 * ``GET /api/export/chat-html`` (see :mod:`app.api.routers.export`).
 * ``GET /api/staff-stats`` (see :mod:`app.api.routers.staff_stats`).
+* ``GET /api/analytics/health`` (see :mod:`app.api.routers.analytics`).
 
 CORS is configured to read explicit allowed origins from ``Settings.cors_origins``
 (comma-separated ``CORS_ORIGINS`` env var). Empty (default) falls back to the dev
@@ -42,6 +43,7 @@ from fastapi.middleware.cors import CORSMiddleware
 
 from app.api.auth import require_auth
 from app.api.routers import (
+    analytics,
     calls,
     customer,
     export,
@@ -98,6 +100,7 @@ app.include_router(search.router)
 app.include_router(sessions.router)
 app.include_router(export.router)
 app.include_router(voice_clips.router)
+app.include_router(analytics.router)
 
 
 @app.get("/api/health")
diff --git a/yunke-server/app/api/routers/analytics.py b/yunke-server/app/api/routers/analytics.py
new file mode 100644
index 0000000..f73fea9
--- /dev/null
+++ b/yunke-server/app/api/routers/analytics.py
@@ -0,0 +1,21 @@
+"""GET /api/analytics/* —— 数据分析板块端组(前缀分组=未来角色权限落点)。"""
+from __future__ import annotations
+
+from typing import Annotated, Any
+
+from fastapi import APIRouter, Depends
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.analytics import health as health_svc
+from app.api.deps import get_session
+
+router = APIRouter(prefix="/api/analytics", tags=["analytics"])
+
+SessionDep = Annotated[AsyncSession, Depends(get_session)]
+
+
+@router.get("/health")
+async def analytics_health(session: SessionDep) -> dict[str, Any]:
+    """E0-lite:数据截至 + 实体新鲜度。"""
+    as_of = await health_svc.data_as_of(session)
+    return {"data_as_of": as_of, "entities": await health_svc.entity_freshness(session)}
diff --git a/yunke-server/tests/test_analytics_api.py b/yunke-server/tests/test_analytics_api.py
new file mode 100644
index 0000000..0779716
--- /dev/null
+++ b/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