Does the questioner want to ask "how long does the background of Tiancai Shanglong ordering system remain"? 30 days. Through the query Tiancai Shanglong restaurant management app shows that the restaurant's ordering records, evaluation records and other data for staffing, menu adjustments, promotions and other strategy development are all backstage data, Tiancai Shanglong ordering system backstage retention of 30 days. Tiancai Shanglong catering and entertainment management system consists of two major subsystems: front office sales and back-office management, of which the front office sales module includes: front desk services, settlement inquiries, the system of three sub-modules; back-office management module includes: daily management, management settings, statistical analysis, inventory management, membership management.