setup-rls

Row Level Security policies control data access at the row level in Supabase tables. Enable RLS on your target table, then create per-operation policies for SELECT, INSERT, UPDATE, and DELETE that check user authentication and authorization rules. Test policies with different roles to verify access restrictions work as intended.

Yes. RLS policies evaluate auth checks for each operation, allowing you to restrict SELECT, UPDATE, and DELETE based on user roles and tenant context. Define policies that match rows to authenticated users or role-based conditions, enabling fine-grained access control across multi-tenant datasets.

After creating RLS policies, validate access by testing each policy with different authenticated roles. Verify that SELECT policies return only authorized rows, INSERT policies accept or reject based on rules, UPDATE policies enforce ownership or role checks, and DELETE policies block unauthorized removal.

Create UPDATE and DELETE policies that wrap auth checks in SELECT statements, comparing the authenticated user's ID against an owner column. This pattern ensures only the row owner can modify or delete records, a common requirement for permission-based access in applications.

Yes. RLS supports separate policies for each operation—SELECT, INSERT, UPDATE, DELETE—with distinct permission checks. Use descriptive policy names and role-specific auth logic to implement granular permission-based access for each operation type.

Wrapping auth checks in SELECT improves policy performance by allowing the database to optimize query execution. This approach reduces computational overhead when evaluating complex authorization logic across large datasets.