Student ledger, and the same lesson on the coach’s phone. A seat on a future roster is now a reservation that holds a session without spending it; the session is only deducted when the coach marks the lesson done or no-show, which is the one place the balance moves. Today Setpoint deducts the moment a student is added to a lesson, so a cancelled class silently costs a session and attendance never touches the ledger. The single primary action on the desktop screen is Adjust balance, which writes one audited ledger row; everything else reads.