I wrote an engine https://github.com/vlado/rails_db_info some time ago and after some recent feedback I’ve come to an idea that it could be merged into Rails (similar to Sextant https://github.com/schneems/sextant#the-future scenario)?
RailsDbInfo adds an html endpoint in development which gives you a quick display of your database schema and contents for reference at http://localhost:3000/rails/info/db
It is a very simple engine with zero dependencies, and if you think that this could be merged I could further improve it and work on merge itself.
You can see some examples here:
Let me know what you think