How Row-Level Security in PostgreSQL Revolutionized Multi-Tenant School Management

The Multi-Tenancy Conundrum

Traditional multi-tenant systems force engineers into a difficult trade-off: manage dozens of fragmented databases (incurring heavy migration costs and connection bloat), or rely solely on application-level filtering (risking accidental data leaks through a single missed WHERE clause).

Native PostgreSQL RLS

With PostgreSQL 17 Row-Level Security, the database itself enforces tenant segregation on every read and write. By binding the session tenant ID directly to transaction-scoped parameters, cross-tenant data leaks are prevented at the lowest engine layer.