How can I recreate a previously deleted Content Type? I have deleted a Content Type called news some months ago using Drupal’s Field UI. Now I would like to recreate a new Content Type with the exact same machine name news. However no Content Type shows up. When I take a look at the database a new entry has been created in the node_type table.

Somehow Drupal doesn’t remove the Content Type in the database. What’s the recommended way to cleanup orphaned Content Types? Why does Drupal keep these leftovers? I don’t want to mess around in database.
You should delete the actual content first before deleting the content type. And nodes are going to be orphaned too and provably they will not display same as the content type news. can you try to search the existing news node in admin/content and check if you can still see the existing node type news that you created before. and try to delete them all before deleting the news content type and try to re-create the news content type.