Email Throttle Schedules verified
The engine's own warm-up: a schedule of steps, each adding a throttle profile on a given day.
In detail
A schedule is a set of rules saying which address-to-domain pairs it covers, and a set of steps saying which profile joins on which day. A step's profile adds to the previous steps rather than replacing them, and the engine tracks each pair's position itself in capacity_schedules_states. We do not use it: warm-up is driven by Hub (DECISIONS § 61), because a second scheduler would be a second source of truth about the same ramp. The catalogue describes the mechanism in full because a customer may already have schedules configured, and a control module that ignores them would misreport why a node is sending slowly.