Why PostgreSQL Is the Most Secure System in the World: Layered Defense from role and schema to GRANT and RLS
Industry security tends to get 'looser the closer you get to the database' — backends often connect directly with an admin account, bare and unguarded. PostgreSQL uses role + schema + column-level GRANT + RLS to build outside-in permissions that can go as fine-grained as a single row (or even a single cell), keeping the last lock inside the database itself.