In a multi-tenant B2B platform, data leakage is an extinction-level event. If Property A logs into your dashboard and accidentally sees the guest data or revenue metrics for Property B, your platform's trust is permanently broken.
Most developers handle data isolation at the application layer. They rely on their Node.js middleware or ORM to append WHERE property_id = X to every single database query.
This is a massive security risk. All it takes is one junior developer forgetting a WHERE clause in a new endpoint, and you have exposed cross-tenant data.
To build a truly secure, enterprise-grade architecture, you must push security down to the database layer. Here is how to build a multi-tenant fortress using PostgreSQL Row-Level Security (RLS).
The Concept: Database-Enforced Isolation
