OK
Subtype of a callback: "DoctorCallback" | "LabResult" | … (null otherwise).
Staff member who promised the client a contact (accountability axis).
Structured contact result set on completion: "Reached" | "LeftVoicemail" | … (null until completed).
True once an overdue callback has been escalated to administrators (PAW-625).
Type of entity this task is linked to (e.g., "appointment", "soap_note")
ID of the linked entity - frontend resolves to URL based on EntityType