test-case: no such table: main.forum_topic__old

class Topic(models.Model):
    author = models.ForeignKey(User, verbose_name=_('User'), null=True, blank=True, on_delete=models.SET_NULL,
                               related_name='topics_author')
    subject = models.CharField(_('Subject'), null=False, blank=False, max_length=256)
    description = RichTextField(_('Description'), null=True, blank=True)
    chapter = models.ForeignKey(Chapter, verbose_name=_('Chapter'), null=True, max_length=256,
                                on_delete=models.SET_NULL)
    tags = models.ManyToManyField(Tag, verbose_name=_('Tags'), blank=True)
    attachments = models.ManyToManyField(Attachment, verbose_name=_("Attachment"))
    is_closed = models.NullBooleanField(verbose_name=_('Topic is closed'), null=True, default=False)
    is_deleted = models.NullBooleanField(verbose_name=_('Topic is deleted'), null=True, default=False)
    rating = models.IntegerField(verbose_name=_('Rating'), default=0)
    created = models.DateTimeField(verbose_name=_('Date created'), auto_now_add=True)
 
    class Meta:
        verbose_name = _('Topic')
        verbose_name_plural = _('Topics')
        ordering = ['-last_activity']
 
    def __str__(self):
        return f' {self.subject} ({self.author.userprofile.fi() if self.author.userprofile else self.author} {self.created:%d.%m.%Y %H:%M:%S})'
 
    def get_absolute_url(self):
        from django.urls import reverse
        return reverse('forum:topic-detail', kwargs={'topic_pk': self.id})
 
    def get_row_classes(self,user):
        row_classes = [CSS_IS_TOPIC,]
        watch_list = WatchList.objects.filter(user=user, object_id=self.id,
                                              content_type=ContentType.objects.get_for_model(Topic))
        if self.is_deleted:
            row_classes.append(CSS_IS_DELETED)
        elif self.is_closed:
            row_classes.append(CSS_IS_CLOSED)
        elif watch_list:
            row_classes.append(CSS_IS_WATCHED)
            watch_obj = watch_list.first()
            if watch_obj.first_not_viewed_comment:
                row_classes.append(CSS_HAS_UNREAD)
        else:
            row_classes.append(CSS_IS_REGULAR)
        return row_classes

def create_topics_comments_and_related_objects(users,chapters,tags):
    topics = []
    comments = []
    bookmarks = []
    usermarks = []
    watchlists = []
    bans = []
    usr_msgs = []
    for i in range(100):
        topic, create = Topic.objects.get_or_create(author=random.choice(users), subject=get_lorem_ipsum(50),description=get_lorem_ipsum(250), chapter=random.choice(chapters),rating=random.randint(-10, 10))
        if create:
            for_tags = tags.copy()
            tags_count = random.randint(1, len(for_tags) // 3)
            for j in range(tags_count):
                topic.tags.add(for_tags.pop(random.randint(1, len(for_tags) - 1)))
...

class test_create(TestCase):
    def test_demiurg(self):
        users, profiles = create_users_and_profiles()
        self.assertEqual(User.objects.all().count(), len(users), 'Проверка создания Users')
        self. assertIsNot(str(profiles[0]), '')
        self.assertIsNot(profiles[0].get_absolute_url(), '')
        self.assertEqual(UserProfile.objects.all().count(), len(profiles), 'Проверка создания UserProfiles')
        self.assertIsNot(str(profiles[0]), '')
 
        chapters = create_chapters(users)
        self.assertEqual(Chapter.objects.all().count(), len(chapters), 'Проверка создания Chapters')
        self.assertIsNot(str(chapters[0]), '')
 
        tags = create_tags()
        self.assertEqual(Tag.objects.all().count(), len(tags), 'Проверка создания Tags')
        self.assertIsNot(str(tags[0]), '')
 
        topics, comments, bookmarks, usermarks, watchlists, bans, usr_msgs = create_topics_comments_and_related_objects(users,chapters,tags)
        self.assertEqual(Topic.objects.all().count(), len(topics), 'Проверка создания Topics')
        self.assertEqual(Comment.objects.all().count(), len(comments), 'Проверка создания Comments')