Articles blog and permanently remove articles after shelf-life expiration

I have an articles-blog and my articles may have a shelf-life of perhaps 1-2 weeks max. In my .htaccess I already ExpiresByType rules. I also have put my articles standard as indexable by the search engines.

When the shelf-life expires, I would like to permanently delete my articles. Now I do this manually and I have a whole lot of "red-crossed-out" articles titles in my back-end.
My question is: What is MODx EVO best practise for my situation and is there an "automatic" way to permanently and completely (so no more red-crossed-out resource titles) remove expired articles from my MODx backend with pre-defined rules (such as max publishing period no more than 3 weeks for example)?