知微 aa4f013ee5 数据新鲜度防御体系(致命错误防御)
根因:今下午报告用周五多周期缓存(multi_tf_cache)作周一操作建议,
中芯国际H浮盈+10%被错报破止损。

修改:
1. price_monitor 新增 live_prices.json 写入(每2分钟刷新所有实时价)
2. 新增 data_freshness.py — data_freshness check function
3. intraday_health_check price_monitor检测从10min收紧到5min
4. 新增 midday MTF cache refresh (11:00+14:00)
5. cron-report-format pre-flight checklist 新增数据新鲜度检查项

所有报告产出前必须先跑 data_freshness,过期则禁止出操作建议
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