...
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\PyHardLinkBackup\backup_app\models.py", line 101, in create
    hash_hexdigest=hash_hexdigest, file_size=file_stat.st_size
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\manager.py", line 127, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\query.py", line 407, in get_or_create
    return self._create_object_from_params(lookup, params)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\query.py", line 447, in _create_object_from_params
    six.reraise(*exc_info)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\utils\six.py", line 686, in reraise
    raise value
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\query.py", line 439, in _create_object_from_params
    obj = self.create(**params)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\query.py", line 348, in create
    obj.save(force_insert=True, using=self.db)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\base.py", line 734, in save
    force_update=force_update, update_fields=update_fields)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\base.py", line 762, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\base.py", line 846, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\base.py", line 885, in _do_insert
    using=using, raw=raw)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\manager.py", line 127, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\query.py", line 920, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\models\sql\compiler.py", line 974, in execute_sql
    cursor.execute(sql, params)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\backends\utils.py", line 79, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\backends\utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\utils.py", line 98, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\utils\six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\backends\utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
  File "c:\users\FooBar\appdata\roaming\pyhardlinkbackup\lib\site-packages\django\db\backends\sqlite3\base.py", line 318, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: UNIQUE constraint failed: backup_app_contentinfo.hash_hexdigest