Ooh, and back when that was not a thing (iirc a few years back) me and a friend of mine had built a spiritually similar index for spicedb for our final year project at uni. We had a mini WAL and the ability to safely reject queries that specified a minimum update requirement after the index updation.
My university had made it mandatory for students to publish atleast 1 paper to graduate from their bachelors degree, and would pay all the associated fees.
Most kids unfortunately did end up paying to publish.
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