Why PostgreSQL Row-Level Security Is the Right Approach to Django Multitenancy

Every SaaS application is a promise: "Your data is yours, and only yours." Every Django developer who's built a multi-tenant app knows how fragile that promise actually is. I'll be honest about how I got here: I was building a Django application and I was, let's say, a bit overambitious. Instead of shipping an MVP first and worrying about multitenancy later, I convinced myself that thousands of customers were right around the corner and I needed to solve tenant isolation now . Classic over-engineering move. I know. But that premature optimization turned into a genuine education. I started evaluating the options, and each one gave me a different kind of anxiety: Separate databases per tenant? Terrible. Connection management alone would be a nightmare. Schema-per-tenant? Better, but I kept reading about migration times growing linearly and PostgreSQL catalog bloat at scale. That didn't feel like something I wanted to sign up for. Application-level filtering with custom managers? The clea