功能：新手引导视频 + 美团券首页分页索引

新手引导视频:运营后台上传 MP4(上限 100MB,魔数校验只认 ISO BMFF),
App 端在领券等候浮层前 N 次以引导视频替代广告。新增 guide_video
的 model/schema/repository/router(App 侧 + 后台侧)与播放记录表迁移。

美团券:首页「销量最高 / 智能推荐」两个 tab 改游标分页,配套两条
(city_id, dedup_key, 排序键 DESC) 复合索引,让 Postgres 顺着索引流式
去重,免掉每翻一页重排整城券的开销。美团 CPS client 在 lifespan 预热
并在关闭时释放连接池。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/admin/main.py

@@ -30,6 +30,7 @@ from app.admin.routers.analytics_health import router as analytics_health_router
 from app.admin.routers.event_logs import router as event_logs_router
 from app.admin.routers.feedback import router as feedback_router
 from app.admin.routers.feedback_qr import router as feedback_qr_router
+from app.admin.routers.guide_video import router as guide_video_router
 from app.admin.routers.huawei_review import router as huawei_review_router
 from app.admin.routers.onboarding import router as onboarding_router
 from app.admin.routers.ops_marquee_seed import router as ops_marquee_seed_router
@@ -40,6 +41,7 @@ from app.admin.routers.wallet import router as wallet_router
 from app.admin.routers.withdraw import router as withdraw_router
 from app.core.config import settings
 from app.core.logging import setup_logging
+from app.integrations import meituan as mt_meituan
 
 setup_logging(debug=settings.APP_DEBUG)
 logger = logging.getLogger("shagua.admin")
@@ -53,6 +55,8 @@ async def lifespan(_: FastAPI) -> AsyncIterator[None]:
         settings.DATABASE_URL.split("://", 1)[0],
     )
     yield
+    # CPS 后台页会打美团(routers/cps.py),那条共享 client 若被建过要在这里关掉连接池
+    mt_meituan.close_client()
     logger.info("admin app shutting down")
 
 
@@ -101,6 +105,7 @@ admin_app.include_router(feedback_router)
 admin_app.include_router(event_logs_router)
 admin_app.include_router(analytics_health_router)
 admin_app.include_router(feedback_qr_router)
+admin_app.include_router(guide_video_router)
 admin_app.include_router(admins_router)
 admin_app.include_router(roles_router)
 admin_app.include_router(audit_router)

app/admin/routers/guide_video.py

@@ -0,0 +1,101 @@
+"""admin 新手引导视频配置:读 / 改开关次数金币 / 上传视频 / 删视频(带审计)。
+
+整份配置存通用 app_config 表(见 app/repositories/guide_video.py),App 领券等候浮层
+每次展示前调 POST /api/v1/guide-video/start 同步。权限:operator 可改(运营维护),
+super 恒可;读为只读(任意已登录 admin)。
+
+⚠️ 视频上限 100MB(settings.GUIDE_VIDEO_MAX_BYTES),已在 admin nginx 为本接口单独放宽
+client_max_body_size,见 shaguabijia-admin-web/deploy/nginx/admin.shaguabijia.com.conf。
+"""
+from __future__ import annotations
+
+from typing import Annotated
+
+from fastapi import APIRouter, Depends, File, HTTPException, Request, UploadFile
+
+from app.admin.audit import write_audit
+from app.admin.deps import AdminDb, get_client_ip, get_current_admin, require_role
+from app.admin.schemas.guide_video import GuideVideoConfigOut, GuideVideoConfigUpdate
+from app.core import media
+from app.models.admin import AdminUser
+from app.repositories import guide_video
+
+router = APIRouter(
+    prefix="/admin/api/guide-video",
+    tags=["admin-guide-video"],
+    dependencies=[Depends(get_current_admin)],
+)
+
+
+def _out(db: AdminDb) -> GuideVideoConfigOut:
+    """配置 + 播放统计合成响应(四个写接口都以最新状态返回,前端一次同步到位)。"""
+    return GuideVideoConfigOut(**guide_video.get_config(db), **guide_video.play_stats(db))
+
+
+@router.get("", response_model=GuideVideoConfigOut, summary="新手引导视频配置(领券浮层)")
+def get_config(db: AdminDb) -> GuideVideoConfigOut:
+    return _out(db)
+
+
+@router.patch("", response_model=GuideVideoConfigOut, summary="改开关/次数/金币(带审计)")
+def update_config(
+    body: GuideVideoConfigUpdate,
+    request: Request,
+    admin: Annotated[AdminUser, Depends(require_role("operator"))],
+    db: AdminDb,
+) -> GuideVideoConfigOut:
+    before, after = guide_video.update_config(
+        db,
+        enabled=body.enabled,
+        max_plays=body.max_plays,
+        reward_coin=body.reward_coin,
+        admin_id=admin.id,
+        commit=False,
+    )
+    write_audit(
+        db, admin, action="guide_video.update", target_type="guide_video", target_id=None,
+        detail={"before": before, "after": after}, ip=get_client_ip(request), commit=False,
+    )
+    db.commit()
+    return _out(db)
+
+
+@router.post("/video", response_model=GuideVideoConfigOut, summary="上传新手引导视频(MP4,带审计)")
+async def upload_video(
+    request: Request,
+    admin: Annotated[AdminUser, Depends(require_role("operator"))],
+    db: AdminDb,
+    file: UploadFile = File(...),
+) -> GuideVideoConfigOut:
+    data = await file.read()
+    try:
+        url = media.save_guide_video(data)
+    except media.MediaError as e:
+        raise HTTPException(status_code=400, detail=str(e)) from e
+    before, after = guide_video.set_video(db, url, admin_id=admin.id, commit=False)
+    write_audit(
+        db, admin, action="guide_video.set_video", target_type="guide_video", target_id=None,
+        detail={"before": before.get("video_url"), "after": url, "bytes": len(data)},
+        ip=get_client_ip(request), commit=False,
+    )
+    db.commit()
+    # 提交成功后再删旧片,避免新片没落库就把旧片丢了
+    media.delete_guide_video(before.get("video_url"))
+    return _out(db)
+
+
+@router.delete("/video", response_model=GuideVideoConfigOut, summary="移除新手引导视频(带审计)")
+def delete_video(
+    request: Request,
+    admin: Annotated[AdminUser, Depends(require_role("operator"))],
+    db: AdminDb,
+) -> GuideVideoConfigOut:
+    """移除后 /guide-video/start 一律返回 should_play=false,领券浮层回到「只放广告」。"""
+    before, after = guide_video.set_video(db, None, admin_id=admin.id, commit=False)
+    write_audit(
+        db, admin, action="guide_video.delete_video", target_type="guide_video", target_id=None,
+        detail={"before": before.get("video_url")}, ip=get_client_ip(request), commit=False,
+    )
+    db.commit()
+    media.delete_guide_video(before.get("video_url"))
+    return _out(db)

app/admin/schemas/guide_video.py

@@ -0,0 +1,25 @@
+"""admin 新手引导视频配置 schemas(开关 / 视频地址 / 前几次 / 每次金币)。"""
+from __future__ import annotations
+
+from pydantic import BaseModel, Field
+
+from app.repositories.guide_video import MAX_PLAYS_LIMIT, REWARD_COIN_LIMIT
+
+
+class GuideVideoConfigOut(BaseModel):
+    enabled: bool
+    video_url: str | None = None   # 相对地址 /media/guide_video/xxx.mp4;未配片 = None
+    max_plays: int
+    reward_coin: int
+    updated_at: str | None = None
+    # 只读统计,后台展示用:已有多少次播放、其中已发币多少次。
+    total_plays: int = 0
+    granted_plays: int = 0
+
+
+class GuideVideoConfigUpdate(BaseModel):
+    """部分更新:只改传入(非 None)字段。视频文件走 /video 上传接口。"""
+
+    enabled: bool | None = None
+    max_plays: int | None = Field(default=None, ge=0, le=MAX_PLAYS_LIMIT)
+    reward_coin: int | None = Field(default=None, ge=0, le=REWARD_COIN_LIMIT)