models.py

@receiver(models.signals.post_save, sender=VerificationDeadline)
@receiver(models.signals.post_delete, sender=VerificationDeadline)
def invalidate_deadline_caches(sender, **kwargs):  # pylint: disable=unused-argument
    """Invalidate the cached verification deadline information. """
    cache.delete(VerificationDeadline.ALL_DEADLINES_CACHE_KEY)