Create automated means of updating the DB diagram

[michplunkett]

What issue are you seeing?

Currently we have to use either an IDE or web application to create our DB diagrams. It'd be great to use something like this to create our DB diagrams and to make sure that the diagram is always up-to-date via a CI process: https://gist.github.com/edgarrmondragon/49de4263cecc5bb98577eaa5bbcad807

cc: @sea-kelp