Defeating the Multi-Tenant SaaS Concurrency Trap in PostgreSQL

Short summary

The article explains how standard read-then-write quota checks in multi-tenant PostgreSQL create race conditions that let users bypass billing gates under concurrent load. The solution is atomic database operations that serialize row updates. The author open-sourced a reference framework with typed enums, balance tracking schemas, and IDE snippets, with a link to an extended paid production bundle.

• •Read-then-write quota checks allow concurrent requests to bypass billing gates
• •Solution requires atomic database operations that serialize row updates before application logic
• •Author open-sourced a reference framework with schema patterns and IDE snippets

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