Churn is the design constraint
If enrolling a new worker means walking to the gate and typing on a keypad, it will not happen reliably, and the site reverts to a register within a month. The only version of this that survives is one where a supervisor can add and remove people from a phone or laptop.
- Enrol and revoke from the browser the same day
- Workers keep one central profile; biometric enrolment is completed or reused according to each gate's device family
- RFID cards for workers whose fingerprints will not read
- Access withdrawn automatically when an assignment ends