basic account setup from external app

[XFFA.IR Bot]

I have an old external app which is not a forum or anything of the kind. However, I have thousands of users. Having said that, is there a doc that explains what tables in xenforo need to be loaded with minimal information to create accounts?

Would like to use sql to do this and just copy over existing userid, emails, name etc ... but what does xf require to be populated at a minimum?

Thanks
JT