Show HN: Open-source revenue recognition and analytics for Stripe and Metronome

Hi HN, I’m Tanin. For about four years, I worked on the Revenue Recognition and Analytics teams at Stripe. Today, I'm open-sourcing Book of Revenue, a self-hosted revenue engine and drop-in alternative to Stripe Revenue Recognition (with optional support for Metronome). ### The Problem: Most founders track MRR or cash collected in Stripe and assume that reflects revenue. But cash collected isn't revenue, and MRR isn't an accounting metric. Once you hit scale, raise institutional capital, or prep for an audit, ASC 606 / IFRS 15 rules kick in: - Annual upfront subscriptions must be amortized monthly as deferred revenue. - Mid-cycle upgrades, prorations, usage overages, refunds, and disputes quickly turn into messy manual spreadsheets. - Finance and engineering end up arguing because Stripe d