{
  "input_rows": 5,
  "catalogue_rows": 4,
  "output_rows": 5,
  "status_counts": {
    "blank_sku": 1,
    "duplicate_catalogue": 1,
    "duplicate_inventory": 2,
    "matched": 1
  },
  "note": "Ambiguous and missing keys flagged; input records are never deleted."
}