erd

I'm pretty sure that I don't have the time or the knowledge to make the whole thing, but I've shared this Lucidchart diagram: https://drive.google.com/file/d/0B_te-VuW3pHaaThGYjZSeVJWU2c/view?usp=sharing on Google Drive, so anyone can amend it. Anyone can get a free Lucidchart account, but I'm...