{
  "schemaVersion": "1.0",
  "experimentId": "product-data-conflicts-2026-09-22",
  "edition": "2026-09-22",
  "exampleOnly": true,
  "asOf": "2026-09-21T16:00:00Z",
  "maxAgeHours": 24,
  "denominator": "Five deliberately authored source/feed pairs: one control and four counterexamples; ten separate single-record reviews. Not a merchant sample or an estimate of error prevalence.",
  "method": "Run each full source and feed record unchanged through reviewInput with empty evidence. Project exactly item_id, price, sale_price and availability from each record into checkFreshness with the supplied capture times and evidence references. No default values or mappings are added.",
  "oracle": "Expected outcomes are explicit assertions in this fixture file; execution records observations separately. The casebook author also selected the checks. This is not an independent or blind evaluation.",
  "sources": [
    "https://www.iamgeorgekelly.com/downloads/product-feed-review.mjs",
    "https://www.iamgeorgekelly.com/downloads/feed-freshness.mjs"
  ],
  "cases": [
    {
      "id": "C00",
      "label": "Matching control",
      "control": true,
      "exampleOnly": true,
      "reason": "The supplied records agree; their observations fall within the chosen 24-hour limit. This still does not authenticate either observation.",
      "source": {
        "capturedAt": "2026-09-21T15:45:00Z",
        "evidenceRef": "synthetic:C00-source",
        "record": {
          "item_id": "CASEBOOK-MUG-BLUE",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "14.00 USD",
          "availability": "in_stock"
        }
      },
      "feed": {
        "capturedAt": "2026-09-21T15:30:00Z",
        "evidenceRef": "synthetic:C00-feed",
        "record": {
          "item_id": "CASEBOOK-MUG-BLUE",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "14.00 USD",
          "availability": "in_stock"
        }
      },
      "expected": {
        "sourceReview": "clear",
        "feedReview": "clear",
        "comparisonStatus": "match",
        "issueCodes": [],
        "changeFields": []
      }
    },
    {
      "id": "C01",
      "label": "Different current sale price",
      "control": false,
      "exampleOnly": true,
      "reason": "Each positive USD sale is below its regular price, but the supplied current source and feed disagree.",
      "source": {
        "capturedAt": "2026-09-21T15:45:00Z",
        "evidenceRef": "synthetic:C01-source",
        "record": {
          "item_id": "CASEBOOK-MUG-BLUE",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "12.00 USD",
          "availability": "in_stock"
        }
      },
      "feed": {
        "capturedAt": "2026-09-21T15:30:00Z",
        "evidenceRef": "synthetic:C01-feed",
        "record": {
          "item_id": "CASEBOOK-MUG-BLUE",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "14.00 USD",
          "availability": "in_stock"
        }
      },
      "expected": {
        "sourceReview": "clear",
        "feedReview": "clear",
        "comparisonStatus": "update_needed",
        "issueCodes": [],
        "changeFields": [
          "sale_price"
        ]
      }
    },
    {
      "id": "C02",
      "label": "Matching but old observations",
      "control": false,
      "exampleOnly": true,
      "reason": "The field values match, but both observations are outside the chosen 24-hour evidence limit.",
      "source": {
        "capturedAt": "2026-09-19T15:30:00Z",
        "evidenceRef": "synthetic:C02-source",
        "record": {
          "item_id": "CASEBOOK-MUG-BLUE",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "14.00 USD",
          "availability": "in_stock"
        }
      },
      "feed": {
        "capturedAt": "2026-09-19T15:30:00Z",
        "evidenceRef": "synthetic:C02-feed",
        "record": {
          "item_id": "CASEBOOK-MUG-BLUE",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "14.00 USD",
          "availability": "in_stock"
        }
      },
      "expected": {
        "sourceReview": "clear",
        "feedReview": "clear",
        "comparisonStatus": "hold",
        "issueCodes": [
          "stale_snapshot"
        ],
        "changeFields": []
      }
    },
    {
      "id": "C03",
      "label": "Different exact item IDs",
      "control": false,
      "exampleOnly": true,
      "reason": "Both IDs are strings; removing a leading zero changes the exact item identity, which must be resolved before field comparison.",
      "source": {
        "capturedAt": "2026-09-21T15:45:00Z",
        "evidenceRef": "synthetic:C03-source",
        "record": {
          "item_id": "00127",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "14.00 USD",
          "availability": "in_stock"
        }
      },
      "feed": {
        "capturedAt": "2026-09-21T15:30:00Z",
        "evidenceRef": "synthetic:C03-feed",
        "record": {
          "item_id": "127",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "14.00 USD",
          "availability": "in_stock"
        }
      },
      "expected": {
        "sourceReview": "clear",
        "feedReview": "clear",
        "comparisonStatus": "hold",
        "issueCodes": [
          "missing_feed_item",
          "missing_source_item"
        ],
        "changeFields": []
      }
    },
    {
      "id": "C04",
      "label": "Matching unknown availability",
      "control": false,
      "exampleOnly": true,
      "reason": "The single-record review allows the string unknown, while snapshot comparison requires known availability to establish agreement.",
      "source": {
        "capturedAt": "2026-09-21T15:45:00Z",
        "evidenceRef": "synthetic:C04-source",
        "record": {
          "item_id": "CASEBOOK-MUG-BLUE",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "14.00 USD",
          "availability": "unknown"
        }
      },
      "feed": {
        "capturedAt": "2026-09-21T15:30:00Z",
        "evidenceRef": "synthetic:C04-feed",
        "record": {
          "item_id": "CASEBOOK-MUG-BLUE",
          "title": "Casebook blue mug",
          "description": "Fictional product for a deterministic local comparison.",
          "url": "https://example.com/casebook-mug-blue",
          "brand": "Example Workshop",
          "seller_name": "Example Retailer",
          "image_url": "https://example.com/images/casebook-mug-blue.jpg",
          "price": "18.00 USD",
          "sale_price": "14.00 USD",
          "availability": "unknown"
        }
      },
      "expected": {
        "sourceReview": "clear",
        "feedReview": "clear",
        "comparisonStatus": "hold",
        "issueCodes": [
          "unknown_availability"
        ],
        "changeFields": []
      }
    }
  ]
}