docs: def logout(self):
          """ Logout user and emit event."""
          from flask_login import logout_user, current_user
          if not current_user.is_authenticated:
              return True
  
          # logout otherwise
          user = current_user
          events.logout_event.send(user)
          logout_user()
  
          # notify principal
          app = current_app._get_current_object()
          identity_changed.send(app, identity=AnonymousIdentity())
  
          return True