Surviving Scale: How to Fix PostgreSQL Deadlocks in Laravel 🛑

The Nightmare of the 500 Server Error As your B2B SaaS platform grows at Smart Tech Devs, you will inevitably start relying on Database Transactions to ensure data integrity. If a user pays an invoice, you need to update their wallet balance and mark the invoice as paid. If one fails, both must roll back. However, under high concurrency, you might suddenly start seeing a terrifying log entry: PDOException: SQLSTATE[40P01]: Deadlock detected . A deadlock occurs when two concurrent transactions ar