def METHOD_NAME(sender, instance, **kwargs):
    if hasattr(instance, '_updating_stats_only'):
        return
    cache.delete_many([make_template_fragment_key('user_about', (instance.id, engine))
                       for engine in EFFECTIVE_MATH_ENGINES] +
                      [make_template_fragment_key('org_member_count', (org_id,))
                       for org_id in instance.organizations.values_list('id', flat=True)])