How to Build True Multi-Tenant Database Isolation...

🚨 If you are building a B2B SaaS, your biggest nightmare isn't downtime—it's a cross-tenant data leak. Most tutorials teach you to handle multi-tenancy like this: // ❌ The Junior Developer Approach const data = await db.query.invoices.findMany({ where: eq(invoices.orgId, req.body.orgId) }); 💥 This is a ticking time bomb. It relies on the developer remembering to append the orgId check on every single database query. If a developer forgets it on one endpoint, Tenant A just saw Tenant B's invoices