with transaction.atomic():
    guide = ExpUser.objects.select_for_update().get(pk=XXX)
    guide.guide_placement_status = ExpUser.PLACEMENT_STATUS_STOPED
    guide.save(update_fields=['guide_placement_status'])





# https://pastebin.com/sgnXsRDG
@receiver(post_save, sender=User)
def update_experience_visibility_after_guide_placement_status_change(sender, instance, created, **kwargs):
    """
    Обновление видимости экскурсиий гида после смены его статуса размещения
    :param core.models.ExpUser instance: гид
    """
    guide = instance
    if guide.is_changed('guide_placement_status'):
        for exp_id in guide.experiences_created.values_list('pk', flat=True):
            update_guide_exp_visibility(exp_id)