Error: Database test_myapp couldn't be flushed. Possible reasons:
  * The database isn't running or isn't configured correctly.
  * At least one of the expected database tables doesn't exist.
  * The SQL was invalid.
Hint: Look at the output of 'django-admin.py sqlflush'. That's the SQL this command wasn't able to run.
The full error: column "id" of relation "threadedcomments_comment" does not exist

...
SELECT setval(pg_get_serial_sequence('"threadedcomments_comment"','id'), 1, false);
...

class ThreadedComment(Comment):
title = models.TextField(_('Title'), blank=True)
parent = models.ForeignKey('self', null=True, blank=True, default=None,
    related_name='children', verbose_name=_('Parent'))
last_child = models.ForeignKey('self', null=True, blank=True,
    verbose_name=_('Last child'))
tree_path = models.TextField(_('Tree path'), editable=False,
    db_index=True)
#id = models.IntegerField()

objects = CommentManager()

def _get_depth(self):
    return len(self.tree_path.split(PATH_SEPARATOR))
depth = property(_get_depth)

def _root_id(self):
    return int(self.tree_path.split(PATH_SEPARATOR)[0])
root_id = property(_root_id)

def _root_path(self):
    return ThreadedComment.objects.filter(pk__in=self.tree_path.
                                          split(PATH_SEPARATOR)[:-1])
root_path = property(_root_path)

def save(self, *args, **kwargs):
    skip_tree_path = kwargs.pop('skip_tree_path', False)
    super(ThreadedComment, self).save(*args, **kwargs)
    if skip_tree_path:
        return None

    tree_path = unicode(self.pk).zfill(PATH_DIGITS)
    if self.parent:
        tree_path = PATH_SEPARATOR.join((self.parent.tree_path, tree_path))

        self.parent.last_child = self
        ThreadedComment.objects.filter(pk=self.parent_id).update(
            last_child=self)

    self.tree_path = tree_path
    ThreadedComment.objects.filter(pk=self.pk).update(
        tree_path=self.tree_path)

class Meta(object):
    ordering = ('tree_path',)
    db_table = 'threadedcomments_comment'
    verbose_name = _('Threaded comment')
    verbose_name_plural = _('Threaded comments')

CREATE TABLE threadedcomments_comment (
comment_ptr_id integer NOT NULL,
title text NOT NULL,
parent_id integer,
last_child_id integer,
tree_path text NOT NULL
);