A search or question event initiated by a person, carrying the requester's identity, the query text, and the context it was issued from.
Very high; the highest-volume transaction type in the domain
Retained for search-analytics purposes; may be purged for privacy after a defined window
Only the control-bearing entities were modelled for lifecycle. Defensible as a starting point, but it does leave the entity model uneven, and this is incompleteness rather than a finding.