Five Runnable Queries Developers Can Use to Verify Tenant Data Isolation

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A technical guide published on DEV Community outlines five concrete, low-cost database queries that developers can run to verify tenant isolation in their own projects. The tests require only two test accounts, a project URL, and a public anon key — no special frameworks or privileged access are needed. The approach distinguishes between reading access-control policies, which confirms intent, and actually probing endpoints, which confirms real-world outcomes. Common failures the tests can surface include private tables remaining readable by anonymous users due to missing or misconfigured row-level security policies. The author recommends wiring these checks into continuous integration pipelines so that isolation boundaries are verified on every deployment, not just once.

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