Separating a user in a group from just a user #162
Description
Currently, a user cannot be registered without being in a group. It is necessary to separate the concept of a registered user and a user in a group. So that you can register without a group or not delete the user himself when he is removed from the group.
Since current behavior may cause loss of Premium status, as well as reset settings, analytics and deletion from cache. At the moment, the situation has been temporarily resolved by removing the connection between the premium user table and the regular user table - when a user is removed from the group, his Premium status is not lost.