Is there a way to auto delete previous posts?

Hi there,
I’m loving this project!
I’m running a timely site, where information is frequently changing / being updated. The data is via RSS feeds mostly (which is handy), so will need to auto import posts, then delete them once the articles / posts are no longer listed in the feeds. So leave ones that are still relevant, then delete when no longer needed. Is this possible?
Cheers