Updates an ad-hoc item's title, notes or optional times. Omitted fields are left unchanged; `notes: null` clears the field. Requires the caller to be an assignee, or hold `user_schedule:update` / `user_schedule:read_all`.
Content type: application/json · schema UpdateAdHocActivityBodyV1
Success response 200 · schema AdHocActivityResponseV1
scheduleprojectTasktickettimeEntryworkflowTasknotificationdocumentlowmediumhighscheduleprojectTasktickettimeEntryworkflowTasknotificationdocument