{
  "canonical_product_url": "Public Packrift product page for the SKU.",
  "cube_ft": "cube_in divided by 1728.",
  "cube_in": "Length x width x height from Packrift catalog dimension fields, in cubic inches.",
  "price_per_cuft_snapshot": "Snapshot catalog price divided by cube_ft. Use Packrift.com checkout or Packrift MCP for live price.",
  "reference_billable_basis_lb": "Maximum of snapshot weight and reference_dim_weight_lb_139 when both are available.",
  "reference_dim_weight_lb_139": "Reference dimensional-weight calculation using cube_in divided by 139. This is a comparison field, not a live carrier quote.",
  "source_row_hash": "Catalog-control source hash for provenance.",
  "weight_density_lb_per_cuft": "Snapshot product weight divided by cube_ft. Null when weight is missing."
}