Where are member's attachment stats stored?

[JamesAB]

Are each member's attachment statistics stored in the database? Or are they calculated on the fly for pages like /profile.php?do=editattachments ?

I'd like to work out a rewards program base on the attachments each member has uploaded. For example, if they have uploaded 10 MB they will get bumped to a different usergroup.

Has anyone else worked on this before? I'd hate to reinvent the wheel.

Any help or advice would be appreciated.

Thanks,
James