Processing feed items without URLs in Artemis

Artemis, the calm web reader I maintain, supports web feeds marked up with h-feed. h-feed allows you to create a web feed in HTML using microformats. A h-feed may contain zero or more h-entries, each h-entry representing an entry in the feed. For example, my longform feed page is a h-entry. I use Granary to convert the longform feed page into RSS.While h-feed is commonly used for marking up lists of blog posts, it can be used for anything. For example, Tantek has a “daylists” page on his website that lists daylists generated by Spotify based on his music tastes. This feed contains a h-entry for each daylist.Uniquely, each entry in the daylists feed does not have a unique URL. Herein lies a story that I want to document both for any interested reader and web reader developers.Identifying a problemAt IndieWebCamp Nürnberg last weekend, I realised that Tantek’s daylists were not showing up in Artemis. This was because Artemis has a unique constraint in the database that says if a given…