Hacker News Reader

Sorry, I don't have a solution. But I use RSS for everything, and I can confidently say: RSS is not designed for your use case.

For the Premium Archive tier, NewsBlur attempts to download a blog's entire backlog to backfill stories, whether it's exposed through paging or RFC 5005. Here's more info about how NewsBlur does it: https://blog.newsblur.com/2022/07/01/premium-archive-subscri...

I had a similar issue where I wanted to read a newly-followed blog from the beginning instead of the point in time when I started to follow, so I created https://refeed.to/

I use Elfeed for Emacs and it stores the history as you download updates so you can always go back and read an old post.