Your Bolt project looks complete, until you look at what it's actually doing

Bolt takes a fundamentally different approach from tools like Cursor, it generates an entire full-stack application in one shot, running in the browser via StackBlitz's WebContainer technology. This creates an illusion of completeness that is more dangerous than obviously incomplete code. When Cursor gives you a broken file, you know it's broken. When Bolt gives you a full application with a login page, a dashboard, API routes, and a database schema, you assume it works. The surface area looks production-ready while the implementation depth is prototype-grade throughout.

The pattern Bolt follows is scaffolding-first development. It creates the file structure, the route definitions, the component hierarchy, and the database schema, then fills in each endpoint and component with the minimum viable logic to make the demo path work. Your user registration endpoint might hash a password and insert a row, but it doesn't check for duplicate emails, validate input length, or handle database connection failures. Your API routes return data, but they don't implement pagination, filtering, or authorization checks. Every feature is a thin veneer over a `// TODO: implement` that was replaced with just enough code to not crash on the happy path.

Because Bolt is built to target whatever stack a prompt calls for, not one backend in particular, its data layer is often the least finished part of the app. When it does reach for Supabase, the integration tends to be more style than substance: the client gets initialized more than once with different configurations, a query that's supposed to hit the database quietly returns a hardcoded array instead, and auth state listeners set up in different files conflict with each other. Realtime subscriptions get created without ever being unsubscribed, which leaks memory slowly enough that it only shows up after the app has been running a while. It looks like a finished backend integration, it's actually a collection of calls that happen to not throw errors during a demo.

If your project was built in Lovable rather than Bolt, the underlying problem is usually the opposite: Lovable wires you to a real, working Supabase backend from the first prompt, so the risk there isn't fake data, it's a real database that was never locked down for actual users.