Multi-Tenancy Skill

SaaS products serve multiple customers on shared infrastructure. The most important property: tenant A can never see tenant B's data.

When to Activate

• Building a B2B SaaS product
• Adding multi-organization support to an existing app
• Implementing Postgres Row-Level Security
• Testing tenant data isolation
• Migrating from single-tenant to multi-tenant architecture
• Choosing between shared-schema RLS, schema-per-tenant, or database-per-tenant isolation models based on compliance and cost requirements
• Writing cross-tenant isolation tests to verify that tenant A cannot read or write tenant B's data under any code path

Isolation Models