The field-level record of exactly what data, from which system, matched to which Canonical Entity Match, grounded which Grounded Prompt Request, for whom, and when.
Highest-volume entity in the domain; scales with request volume times average fields per request
Regulatory-driven; append-only, never edited once written
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.