Row Level Security (RLS)

Database-level data isolation for multi-tenant applications.

When to Use This Skill

• Building multi-tenant SaaS applications
• Ensuring users can only access their own data
• Implementing organization-based data isolation
• Adding defense-in-depth security layer

Why RLS?

Application-level filtering can be bypassed. RLS enforces access at the database level:

❌ Application Filter: SELECT * FROM posts WHERE user_id = ?
   (Bug in code = data leak)