feat(coupon): 今日跑完整轮领券后端记录 + 查询(首页置灰源) (#34)

新增 coupon_daily_completion 表:按 (device_id, 自然日) 记"今天是否已跑完
整轮领券(到 done 帧)"。客户端据此把首页「去领取」卡置灰、不可点。

口径(用户决策 A 方案):到 done 即算,不管单券成败 —— 失败/跳过常是无障碍/
环境问题,重复点也补不回来。判断维度 device_id,与 engagement/claim 一致。

- model CouponDailyCompletion(uq device+complete_date,仿 CouponPromptEngagement)
- repo has_completed_today / mark_completed_today(幂等 upsert + IntegrityError 兜底)
- schema CouponCompletedTodayOut(completed: bool)
- coupon_step 透传链路在 action.command=="done" 那帧 best-effort 写完成记录
  (pricebot 只在整轮全跑完才保留 command=="done",故无需再判 continue)
- GET /api/v1/coupon/completed-today?device_id= 供首页查询
- alembic 迁移 coupon_daily_completion(down_revision=0cf18d590b1d 当前 head)

合并后需 alembic upgrade head,否则 /completed-today 500。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: no_gen_mu <liujianhishen@gmail.com>
Reviewed-on: #34
Co-authored-by: liujiahui <liujiahui@wonderable.ai>
Co-committed-by: liujiahui <liujiahui@wonderable.ai>

app/api/v1/coupon.py

@@ -23,7 +23,11 @@ from app.core.config import settings
 from app.core.pricebot_router import pick_pricebot
 from app.db.session import SessionLocal
 from app.repositories import coupon_state as coupon_repo
-from app.schemas.coupon_state import CouponPromptDismissIn, CouponPromptShouldShowOut
+from app.schemas.coupon_state import (
+    CouponCompletedTodayOut,
+    CouponPromptDismissIn,
+    CouponPromptShouldShowOut,
+)
 
 logger = logging.getLogger("shagua.coupon")
 
@@ -76,6 +80,14 @@ def _record_claims_blocking(
         coupon_repo.record_claims(db, device_id, user_id, trace_id, results)
 
 
+def _mark_completed_blocking(
+    device_id: str, user_id: int | None, trace_id: str | None
+) -> None:
+    """独立 session 写"今日已跑完整轮"(到 done 帧那刻调,best-effort 不阻塞领券)。"""
+    with SessionLocal() as db:
+        coupon_repo.mark_completed_today(db, device_id, user_id, trace_id)
+
+
 @router.post("/step", summary="领券任务步进 (透传到 pricebot)")
 async def coupon_step(
     request: Request,
@@ -160,6 +172,19 @@ async def coupon_step(
             except Exception as e:  # noqa: BLE001
                 logger.warning("coupon claim write failed: %s", e)
 
+    # 整轮跑完(done 帧)→ 记一条"今日已完成",首页「去领取」卡据此置灰。
+    # pricebot 把中途单券 done 改写成 wait+continue=true,只有整套全跑完那帧才保留
+    # command=="done"(见 pricebot main.py),故 done 已等价"整轮完成"(用户决策 A 方案:
+    # 到 done 即算,不管单券成败),无需再判 continue。写库失败绝不连累领券返回。
+    action = resp_json.get("action") or {}
+    if device_id and action.get("command") == "done":
+        try:
+            await run_in_threadpool(
+                _mark_completed_blocking, device_id, user_id, trace_id
+            )
+        except Exception as e:  # noqa: BLE001
+            logger.warning("coupon completion write failed: %s", e)
+
     return resp_json
 
 
@@ -195,3 +220,19 @@ def coupon_prompt_reset(payload: CouponPromptDismissIn, db: DbSession) -> dict[s
     开发设置「重置今日领券弹窗状态」按钮调。MVP 不鉴权,按 device_id。"""
     coupon_repo.reset_today_engagement(db, payload.device_id)
     return {"ok": True}
+
+
+@router.get(
+    "/completed-today",
+    response_model=CouponCompletedTodayOut,
+    summary="这台设备今天是否已跑完整轮领券(到 done 帧)",
+)
+def coupon_completed_today(
+    device_id: str, db: DbSession
+) -> CouponCompletedTodayOut:
+    """今天这台设备已跑完整轮(到 done)→ completed=true。客户端据此把首页「去领取」
+    卡置灰、不可点(用户决策 A 方案:到 done 即算,不管单券成败)。判断维度 device_id
+    必须与领券循环上报的一致(客户端两端都用 ANDROID_ID)。"""
+    return CouponCompletedTodayOut(
+        completed=coupon_repo.has_completed_today(db, device_id)
+    )