- preset TRIGGER:-PT30M → reminderLeadMinutes=30 - no VALARM → reminderLeadMinutes=null - absolute DATE-TIME trigger → null (custom kind, D-07/NOTIF-05) - two VALARMs → null (multiple alarms not resolvable to single lead) - onDuplicateKeyUpdate set also carries reminderLeadMinutes (upsert keeps column current)