Confirm
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→Proposed new definition
With this trick, we can just store '''now() + t''' in the database, and we're done.
* No recomputation is necessary. Decay just happensimplicitly as '''t''' is stored and computed relative to different '''now()''' dates.
* Sorting by (current) frecency score is equivalent to sorting by reverse date (on which the frecency will be 1).
* Adding a visit just requires converting the date to a score, adding to the score, and converting the score back into date.
