Creates a personal, self-assigned ad-hoc to-do rendered as a schedule activity. Times are optional; when both are supplied the end must be after the start. Gated by `user_schedule:read`.
Content type: application/json · schema CreateAdHocActivityBodyV1
Success response 201 · schema AdHocActivityResponseV1
scheduleprojectTasktickettimeEntryworkflowTasknotificationdocumentlowmediumhighscheduleprojectTasktickettimeEntryworkflowTasknotificationdocument