System diagram

Components:

Dbserver – 1 per customer

Web server – 1 per customer, only for those that requires web apps (provider or end customer portal).

AppServer – one server, connecting to all dbservers

tennisvenues server – one server, allow public to book court etc

classhub server – one server, allow public to enrol in a class

control panel – internal tool (web) that monitors / control dbservers.