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FSD Paid/UnPaid
One of the amazing feature would if on the firmware details page for a fleet car - if it shows the car has fully paid FSD (or subscription) or not. This will tell other users that if a customer is upgrading to lets say from 2022.40.4 to 2022.36.6 - did that person already had FSD or not.
Just an idea, I don't know if your database is collecting that info or not.
Customer support service by UserEcho