code: def create_session(user):
      
  
      def cb():
          if user:
              if __options__.get("require_email_verification") and not user.email_verified:
                  raise exceptions.VerifyEmailError()
              if flask_login.login_user(user):
                  user.update(last_login_at=utc_now())
                  return user
          return None
  
      return signals.user_login(cb)
docs: Create the login session 
      :param user: UserModel
      :return: