Supabase Row Level Security in Production: Patterns That Actually Work

Supabase Row Level Security (RLS) is PostgreSQL's built-in access control system. When it's set up correctly, your database enforces authorization at the data layer — not just in your API. When it's set up wrong, your users see each other's data and you don't find out until someone reports a bug. I've shipped three production apps with Supabase RLS. Here's what I've learned. What RLS actually does Without RLS, any query to your Supabase table returns all rows. With RLS enabled and policies defin