How long will the WeChat clear record be eliminated?

The 30-day code means that all passengers must show their health codes to the relevant staff before entering the subway security check. Location codes that have not been scanned for more than 30 days can be deleted. Wechat is a free application launched by Tencent on 2011121,which provides instant messaging service for intelligent terminals. It was created by the product team of Tencent Guangzhou R&D Center led by Zhang Xiaolong.