fix: 宽限期从查询时间(checked_at)算起而非 API 数据日期

API 数据日期可能本身就在几天前（如周末不更新），导致宽限期
误判为过期。新增 checked_at 字段记录查询时间，宽限期从
该时间算起，确保检查更新的结果在关闭重开后仍有效。

Author: Astro-Han

quantclass_sync_internal/data_query.py

@@ -97,12 +97,15 @@ def get_products_overview(
             ref_date = api_date
         else:
             # 用缓存的 API 日期作为参考，避免周末/假日误报落后；
-            # 缓存超过宽限期或无缓存时降级回 today，提示可能有新数据
+            # 缓存超过宽限期或无缓存时降级回 today，提示可能有新数据。
+            # 宽限期从"上次查询/同步时间"算起（checked_at 优先，降级到 date_time）
             cached_api_date = _parse_date(last.get("date_time", ""))
+            freshness_anchor = _parse_date(last.get("checked_at", "")) or cached_api_date
             cache_fresh = (
                 cached_api_date is not None
+                and freshness_anchor is not None
                 and today is not None
-                and (today - cached_api_date).days <= _STALE_GRACE_DAYS
+                and (today - freshness_anchor).days <= _STALE_GRACE_DAYS
             )
             ref_date = cached_api_date if cache_fresh else today
 

quantclass_sync_internal/status_store.py

@@ -498,10 +498,12 @@ def update_api_latest_dates(log_dir: Path, api_latest_dates: Dict[str, str]) ->
                 existing = _scan_reports_for_backfill(log_dir)
         else:
             existing = _scan_reports_for_backfill(log_dir)
+        checked_at = datetime.now().strftime("%Y-%m-%d")
         for product, date_str in api_latest_dates.items():
             if product in existing:
                 existing[product]["date_time"] = date_str
+                existing[product]["checked_at"] = checked_at
             else:
-                existing[product] = {"status": "", "reason_code": "", "error": "", "date_time": date_str}
+                existing[product] = {"status": "", "reason_code": "", "error": "", "date_time": date_str, "checked_at": checked_at}
         with atomic_temp_path(status_path, tag="last_status") as tmp:
             tmp.write_text(json.dumps(existing, ensure_ascii=False, indent=2), encoding="utf-8")