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Antifailure Sells a Disposable Production Twin Per Pull Request, Including a Firewall That Fakes Stripe and SendGrid
Antifailure launched on Show HN on 2026-09-06 with four components: an Isolated Twin destroyed after the test, Safe State (sanitized, referentially consistent, production-shaped Postgres), a Side-Effect Firewall that simulates Stripe and SendGrid instead of calling them, and Load, which replays production traffic patterns from access logs. It is aimed squarely at the gap between a preview environment and database branching, where neither Vercel-style previews nor Neon-style branches give you real traffic or safe external calls. The side-effect firewall is the piece nobody else packages, and it is the reason most teams never test migrations against real data.
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