Shifting Authorization Logic to the Database: Supabase RLS for Multi-tenant Applications

Moving Row Level Security enforcement from application code to the database layer fundamentally changes how SaaS developers architect multi-tenant systems. This approach eliminates scattered permission checks across the codebase, replacing them with centralized SQL policies that are harder to misconfigure or bypass. By leveraging JWT custom claims for performance optimization, teams can achieve enterprise-grade tenant isolation without the overhead of constant database lookups.