Hi,
I have a bug when i try to remove group on my user sshportal.

Actual Result / Problem

`user update --unassign-group my_group my_user

error: unsupported relations: Roles`

Expected Result / Suggestion

I expect that group was removed

Some context

docker version of sshportal
image :
moul/sshportal latest 231c35fcc3c2 3 weeks ago 24.8MB

OS Type: linux
OS Architecture: amd64
Go routines: 12
Go version (build): go1.17.6
DB Driver: sqlite3
DB Conn: /var/lib/sshportal/sshportal.db
...

Best regards.