signal

signals.py

@receiver([post_save, post_delete])
def save_change_of_state(sender, **kwargs):
    if sender != State:
        try:
            rec_id = kwargs['instance'].id
            if not 'created' in kwargs:  # this was deletion
                State(record_id=rec_id, model=sender, state='deleted').save()
                print 'deleted'
            elif kwargs['created']:  # creation of new record
                State(record_id=rec_id, model=sender, state='created').save()
                print 'created'
            else:  # changing of existing record
                State(record_id=rec_id, model=sender, state='changed').save()
                print 'changed'
        except TypeError:
            pass
        except AttributeError:
            pass
        except DatabaseError:
            pass