Architecting Multi-Tenant SaaS with PostgreSQL Row-Level Security (RLS)
How to eliminate cross-tenant data leaks and enforce strict tenant isolation directly at the database layer using Supabase and PostgreSQL 16.
Cross-tenant data leakage is the number one security vulnerability in multi-tenant B2B software. In traditional backends, developers rely on manual SQL 'WHERE tenant_id = ?' clauses in application code—meaning a single forgotten WHERE clause exposes private customer data to competitors.
The Solution: Database-Level Row-Level Security (RLS)
Row-Level Security in PostgreSQL 16 shifts security enforcement from application code directly into the database engine. Even if a compromised backend API runs 'SELECT * FROM invoices', PostgreSQL automatically filters rows based on the authenticated user's JWT claim.
How We Implement Zero-Trust RLS at Bintrix:
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