PostgreSQL Row Level Security: The Right Way to Lock Down Your Data

PostgreSQL Row Level Security: The Right Way to Lock Down Your Data Row Level Security (RLS) enforces access control inside the database, not the application layer. After running 12 parallel AI instances touching the same Supabase database, this is the pattern that keeps the data clean. Why Application-Layer Checks Aren't Enough App-layer check: request → Edge Function → "Does this user have access?" → SQL Problem: EF bug / new instance forgets the check → full table exposed RLS: request → SQL r