[pure_simplicity]

This is not quite what I'm looking for. It needs to be CLI based so it can work with local markdown files in a way that can be easily automated. Also this website isn't tailored for visualizing a database schema, so to repurpose it for that use case requires significant effort. Looking at DBeaver's ER Diagram should like the OP in this response thread suggested should give you a good idea of how I want things to look.

I may have found what I'm looking for from a different top level answer though. Thanks for your contribution.