challengeRun

Custom pre-run gate called after Kronos's own scheduling validation. Return true to skip this cycle; return false (default) to allow execution.

Use this to express scheduling patterns that Periodic alone cannot:

• Bi-weekly: schedule with Periodic.everyWeek and skip odd cycles: return cycleNumber % 2 != 0

• Specific day of week at a custom interval: schedule with Periodic.everyDay and skip any day that isn't the target: return LocalDate.now().dayOfWeek != DayOfWeek.TUESDAY

• Second Tuesday of the month: combine both — schedule weekly, skip non-Tuesdays and weeks that aren't the second occurrence in the month.

Unlike cron expressions, this logic is plain Kotlin, so arbitrarily complex runtime conditions (feature flags, public holidays, database lookups) are straightforward.