I am not familiar with Request Tracker at all, but a quick Google search shows how to configure the database.
Here is the link: https://wiki.archlinux.org/index.php/Request_Tracker
In the middle of the page there is a section on creating the mysql database.
There is a reference to /opt/rt4/etc/schema.mysql which seems to hint there is a schema you can look at.
Also, one the database has been created you can easily explore the data model.
Hope this helps.
Jack Poorte, Dec 11, 2014