We use Xenforo as our core:
https://xenforo.com/
...and a number of add ons both public and custom commissioned. It would not be helpful to provide you all that, though, as you would end up with a large amount of bulk on top of the core product that you likely wouldn't need or can download anyway (add-ons). There are a number of paid for plugins as well as our commissioned work though that we wouldn't be able to give out so, a full database schema is unreasonable to provide.
Sorry
but hope this helps. Xenforo is a pretty good product.