A good PostgreSQL schema does more than store data. It protects important rules, makes common queries efficient, and gives the application a stable foundation as requirements grow. Model the domain before the tables Start with the real concepts and their relationships. In a library reservation system, users make reservations, libraries contain seats, and every reservation…
Tag: PostgreSQL
Preventing Double Booking in a Reservation System
Double booking is one of the most important problems in any reservation system. Two users may see the same seat as available and submit their requests almost at the same time. A simple availability check is not enough when requests run concurrently. Why the basic check fails Imagine that request A checks seat 12 and…