VALID_SCHEDULES

const VALID_SCHEDULES: readonly ["every 30 minutes", "every 1 hour", "every 2 hours", "every 4 hours", "every 6 hours", "every 12 hours", "daily", "weekly", "monthly", "yearly", "on demand"];

The sync cadences a manifest may name. A schedule is a human-readable phrase rather than a cron expression because it is shown to the person enabling the source; the scheduler maps each phrase to an interval.

The list is closed on purpose. An unrecognised cadence used to be quietly treated as daily, which meant a source asking for “hourly” ran 24× less often than its author believed, and nothing said so.