code: def disconnect_handler(remote, *args, **kwargs):
      
      if not current_user.is_authenticated:
          return current_app.login_manager.unauthorized()
  
      account = RemoteAccount.get(user_id=current_user.get_id(),
                                  client_id=remote.consumer_key)
      external_id = account.extra_data.get('external_id')
  
      if external_id:
          oauth_unlink_external_id(dict(id=external_id, method='cern'))
      if account:
          with db.session.begin_nested():
              account.delete()
  
      disconnect_identity(g.identity)
  
      return redirect(url_for('invenio_oauthclient_settings.index'))
docs: Handle unlinking of remote account.