Hi,
this depends on whether you want to look at the data from IS User Management (users.cnf and the different acl*.cnf files in the IS config directory; via WmRoot hidden services) or the MWS User Managements (via wM CDS API services).
The MWS database schema is quite a complex one having several sections for different purposes.
When you really want take a deep dive into the MWS user management tables, look for those starting with WM_XT_*.
Regards,
Holger