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  1. Learning
  2. Tenant isolation, explained
Developer guideIntermediate · 1 min read

Tenant isolation, explained

How one business’s data stays away from another’s.

Two layers

Each business-owned row carries a business id. The database enforces access with row-level security, and the API independently checks membership and role on every request. Either layer alone would be one bug from a leak; together a single mistake is not enough.

For AI

The model never chooses which business to read. The system fixes the business from the authenticated session before any tool runs.

Test it

  • Write a test that a user of business A cannot read or write business B.
  • Test the negative path for every new table and endpoint.

Part of: Developer fundamentals

Next recommendedEvaluating an AI feature

Related

  • How retrieval grounds an answer

Last updated 2026-09-25. Something unclear or wrong? Tell us.

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