5
Only an annotation.
I have downlaoded some free avatar, and upload they in SITE_ROOT/uploads/avatars directory. When an user change is avatar the old was removed from DB and phisically from server. This because in user.php there is a control for remove custom avatar, this control is made matching savt at the start of avatar url.
I suggest you to call the directory of your avatars savt, or any other name that begin with savt, so you don't lost 1 avatr any user change