models.py

    def __str__(self):
        return f'{self.title} from {self.full_name} for {self.page.title}'

    def __repr__(self):
        return f'<{self.__class__.__name__}: {self.user}, {self.round}, {self.page}>'


@receiver(post_transition, sender=ApplicationSubmission)
def log_status_update(sender, **kwargs):
    instance = kwargs['instance']
    old_phase = instance.workflow[kwargs['source']]

    by = kwargs['method_kwargs']['by']
    request = kwargs['method_kwargs']['request']

    if request:
        messenger(
            MESSAGES.TRANSITION,
            user=by,
            request=request,
            submission=instance,
            old_phase=old_phase,
        )


class ApplicationRevision(models.Model):
    submission = models.ForeignKey(ApplicationSubmission, related_name='revisions', on_delete=models.CASCADE)
    form_data = JSONField(encoder=DjangoJSONEncoder)
    timestamp = models.DateTimeField(auto_now=True)
    author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True)

    class Meta:
        ordering = ['-timestamp']