{
  "columns": {
    "record_id": {"type": "string", "required": true},
    "sku": {"type": "string", "required": true},
    "status": {"type": "enum", "values": ["active", "inactive"], "required": true},
    "note": {"type": "string", "required": false}
  },
  "revision": "2026-09",
  "contract_id": "workbook-collection"
}