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Persist sourcing what-if cases as auditable calculation sets: baseline origin, alternatives, policy source version, duty stack, landed cost, warnings, and stale-state evidence.
Baseline plus alternatives with shared HTS, origin, entry mode, annual volume, FTA, Chapter 98, and AD/CVD assumptions.
Each save stores the deterministic duty stack, landed-cost result, warning list, source list, and engine version.
Stale cases are explicit. Recalculation and change-event review can be layered on top of the stored model.