Multi-Tenant Auth with Cognito and PostgreSQL Row-Level Security (Part 2)

<p><em>Sign-in, tables and row-level security for a Flutter app — from one prompt, and what we learned about doing it safely</em></p> <p>Most AI app builders stop at the screens.

<p>If your SaaS charges customers and also plugs into those customers' billing stack, you do not have one billing problem. You have two.</p> <p>You need to bill your own customer

<p>When you're building a multi-tenant SaaS, the first architectural question is usually: how do you keep tenant data isolated? The options range from separate databases per

<p>so I've been building <a href="https://ship-safe.co" rel="noopener noreferrer">ShipSafe</a> — security scanner for AI-generated code — and a few weeks ago I got curious. like,

<p>Building a B2B SaaS platform for transport companies, I faced a critical architectural decision: separate database per tenant or shared database with logical isolation?</p>

<p>Multi-tenancy has three common implementations: a database per tenant, a<br /> schema per tenant, and a column on every row. For a SaaS that starts small and<br /> must stay

<blockquote> <p><em>JWT tutorials only teach the easy part. Here's what happens after.</em></p> </blockquote> <p>Most auth tutorials end at "user logs in, gets a token, done." And