RetentionPolicy
data class RetentionPolicy(val succeededFor: Duration = 24.hours, val cancelledFor: Duration = 24.hours, val deadLetteredFor: Duration? = null)
Retention for terminal job runs. Cleanup executes as a built-in recurring job on Klokka's own machinery. Dead-lettered runs default to being kept forever (null): they are deleted only when an operator or an explicit policy says so.