Security models in enterprise software must support granular authorization policies across organizations, departments, and individual user roles. Designing RBAC directly into relational schemas guarantees data integrity.
1. Normalizing Roles and Permissions
Using junction tables (user_roles, role_permissions) decouples authorization rules from core business logic, enabling dynamically editable permissions without schema migrations.
2. PostgreSQL Row-Level Security (RLS)
Enabling RLS on sensitive tenant tables ensures that even direct SQL queries automatically enforce tenant isolation policies via `current_setting('app.current_tenant_id')`.
3. Fast In-Memory Permission Caching
Caching evaluated JWT authorization scopes in Redis reduces database permission lookups to sub-millisecond responses while maintaining real-time revocation capabilities.