code: def welcome(self):
          
          if not g.user or not g.user.get_id():
              return redirect(appbuilder.get_url_for_login)
  
          welcome_dashboard_id = (
              db.session
              .query(UserAttribute.welcome_dashboard_id)
              .filter_by(user_id=g.user.get_id())
              .scalar()
          )
          if welcome_dashboard_id:
              return self.dashboard(str(welcome_dashboard_id))
  
          payload = {
              'user': bootstrap_user_data(),
              'common': self.common_bootsrap_payload(),
          }
  
          return self.render_template(
              'superset/basic.html',
              entry='welcome',
              title='Superset',
              bootstrap_data=json.dumps(payload, default=utils.json_iso_dttm_ser),
          )
docs: Personalized welcome page