PostgreSQL Row-Level Security: A Tenant-Isolation Design and Test Checklist

PostgreSQL row-level security (RLS) can enforce which rows a role may select, insert, update, or delete, but it must be designed with roles, bypass privileges, connection pooling, and migrations in mind. Put tenant identity in a trusted server-side context, write explicit policies, and test cross-tenant access as an adversarial case. RLS complements application authorization; it does not replace it.

A practical workflow

1. Define tenant ownership and shared-resource rules before writing SQL.
2. Separate migration, application, and operational roles and review bypass privileges.
3. Set tenant context only after authenticating the request.
4. Create policies for every operation and test default-deny behavior.
5. Run integration tests through the same pooler and transaction pattern used in production.

Before you submit, buy, or publish

• Check views, functions, superusers, backups, and exports.
• Avoid trusting user-supplied tenant IDs without server authorization.
• Test inserts and updates that change tenant ownership.
• Log policy failures without exposing sensitive data.

Caveats that matter

PostgreSQL versions and application frameworks differ. A policy that looks correct in a unit test can fail through a privileged role or pooled connection.

Frequently asked question

Does enabling RLS automatically secure every table? No. Enable and audit it per table and role.

Primary source

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