Tag

Concurrency

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20261 post

Oct 22, 2026 · 9 min readPreventing Double Bookings in Postgres with SELECT FOR UPDATETwo members, one spot left. How a gym-booking app stops overbooking with Postgres row locks, the race reproduced without them, and two lock mistakes found along the way.
- Building Apps
- Postgres
- Concurrency
- Drizzle