docs: def post(self) -> Vpn:
          """
          Creates the vpn with the given data.
          """
          vpn = Vpn()
          session.add(vpn)
          self.update(vpn)
          session.flush()
          session.commit()
          return vpn, 201, {
              'Location': url_for('vpn', vpn_id=vpn.id)
          }