Did you pick a rigid database schema too early?

Picking a flexible setup feels like overengineering when you're just starting out so we just threw everything into one flat database table to move fast.

It seemed like the right call at the time because we shipped our MVP in two weeks. But six months later when we needed to add relational data and user permissions, refactoring that massive table took an entire month of halted development. Sometimes moving too fast in week one creates a massive anchor in month six.

Did you stick with a simple database structure early on, or did you prep for scale from day one?