Struct Lowered 

pub struct Lowered {
    pub cron: String,
    pub mode: ExecMode,
    pub cooldown: Option<String>,
    pub tz: ScheduleTz,
}

What a When lowers to — the exact (cron, mode, cooldown) trio the pre-#418 engine ran on. Keeping the engine vocabulary unchanged is what lets Phase 1 swap the operator surface without touching the tick / dedup machinery.

Fields

cron: String

Cron handed to tokio-cron-scheduler — POLL_CRON for reconcile shapes, a 6/7-field cron for calendar shapes.

mode: ExecMode

Dedup semantics for decide_fire.

cooldown: Option<String>

Humantime re-arm interval (None = succeed once, skip forever).

tz: ScheduleTz

Timezone to evaluate cron in (#418 Phase 2). The scheduler passes this to Job::new_async_tz. Reconcile shapes carry the schedule’s tz too even though POLL_CRON is tz-agnostic, so the same value drives the active-window check.