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A long time back I had a go at this too, but reimplementing ttrss's api instead: https://github.com/nvtrss/nvtrss
I learnt a lot. My goal was getting something working that the ttrss android app would connect to and I reasonably succeeded there, running it for a year or so.
I went back to hosting the full ttrss application at some point.
Un-duplicating RSS items is hard. Timestamps can't be trusted. IDs can't be trusted. Some sources will resend the same item with a different timestamp. RSS servers behind a load balancer may return different IDs and timestamps for the same items. I had to compute a hash of each item to reliably remove duplicates.
Here's a un-duplicator in a feed reader I wrote back in 2009.[1] This is used for printing RSS feeds on antique teletype machines. Reliable duplicate removal is essential when printing at 5 characters per second.
[1] https://github.com/John-Nagle/baudotrss/blob/master/messager...
