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Solving the Double-Booking Problem in Real-Time Restaurant Systems
Implementing strict transactional safety and buffer logic for high-demand restaurant reservation systems.
Read time: 8 minProject: EATMEAT
The Race Condition Conflict
In a high-traffic environment, two users might try to book the same table slot within milliseconds of each other.
Standard optimistic locking wasn't enough; we needed a way to guarantee atomicity at the database level while maintaining a smooth UI.
Atomic Transactions with Prisma
We utilized Prisma's `$transaction` API with serializable isolation levels to ensure that a slot check and reservation happen as a single unit of work.
If the slot is taken during the process, the transaction rolls back, and the user receives an immediate 'Slot Unavailable' notification without a page refresh.
- Row-level locking for specific time slots.
- Automated release of 'Hold' status if payment isn't initiated within 5 minutes.
- Buffer logic to automatically block 15 minutes before and after each reservation for table cleaning.