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Re:Show HN: IndieFeeds.com, HN clone where submissions come ... by mdoliwa on Saturday October 16, 2021 @07:16AM (#28887077)
Not sure where I found it, but I have it coded like this:

scope :ranked, -> { select('posts.*, ((posts.upvotes_count + 1) / POWER(EXTRACT(EPOCH FROM (NOW() - posts.published_at)), 1.8)) AS rank').order('rank DESC') }

Re:Show HN: IndieFeeds.com, HN clone where submissions come ... by manx on Saturday October 16, 2021 @10:35AM (#28888155)
That's almost the HN formula. Make sure your age is calculated as hours.