Allows to you to set the datetime of expiration and the schedule which overwrites the another post.
Datetime of Expiration
When it becomes the datetime of expiration, the status of post is changed to ‘draft’.
Overwrite the another post
When the scheduled post(A) is published by wp cron, the new post(A) overwrite the another post(B) and the old post(B) is changed to draft.
The slug of the new post(A) is changed to the slug of the old post(B).
The slug of the old post(B) is changed to the slug of the new post(A).
This Plugin published on GitHub.