First of all, thanks for this app - it helped me troubleshoot my relation definitions. The visualizer is just super-duper helpful. ❤️

The whole looks very aesthetic, but it steals a bit from the usability of the editor, namely:

• Line numbers - this could be useful for longer schemas,
• Editor scrollbars are missing - having to use mousewheel to go back and forth is a bit painful, especially for scrolling longer files,
• Scroll position is not kept when switching between files.

These are minor things, but affect the experience of using the playground. I used it by pasting the whole schema (which is quite long) and then started narrowing down to just necessary tables, but working with such long file was a bit confusing and cumbersome without these features.