Mastering Supabase RLS: How to Prevent Data Leaks in Production

Row Level Security is the critical defense against unauthorized data access in multi-user applications, but misconfigurations are alarmingly common and catastrophic when they occur. Properly configuring RLS policies and using the correct security keys determines whether your app protects user data or exposes it to every user. This guide distills real-world production patterns that prevent the most dangerous RLS mistakes.