{
  "initial": {"successful_clients": ["A", "C"], "pending_clients": ["B"], "successful_record_count": 3, "a_qty_total": 5},
  "final": {"clients": ["A", "B", "C"], "record_count": 4, "a_qty_total": 5, "b_name": "部品B", "c_date": "2026-10-01"},
  "invariants": {"retry_only": ["B"], "unchanged_clients": ["A", "C"], "same_contract_version": "2026-09"}
}