code: def list_roles():
      
      click.echo(green('\nListing roles:'))
      click.echo(green('-' * 40))
      with get_app().app_context():
          roles = Role.query.all()
          if not roles:
              click.echo(red('No roles found'))
              return
  
          for index,role in enumerate(roles):
              click.echo('{}. {}: {}'.format(
                  index + 1,
                  yellow(role.handle),
                  role.title
              ))
  
      click.echo()
docs: List existing roles