{
  "synthetic": true,
  "case": "marketplace-watch",
  "data": {
    "criteria": {
      "brands": [
        "A",
        "B"
      ],
      "max_price_usd": 300,
      "max_distance_miles": 30,
      "condition": "Seller claims good or better"
    },
    "snapshots": [
      {
        "row": "L01",
        "listing_id": "item1",
        "brand": "A",
        "price": 280,
        "distance": 12,
        "condition_claim": "good",
        "state": "available",
        "observed": "2026-10-16T09:00:00+08:00"
      },
      {
        "row": "L02",
        "listing_id": "item2",
        "brand": "B",
        "price": 320,
        "distance": 10,
        "condition_claim": "good",
        "state": "available"
      },
      {
        "row": "L03",
        "listing_id": "item3",
        "brand": "A",
        "price": 250,
        "distance": null,
        "condition_claim": "good",
        "state": "available"
      },
      {
        "row": "L04",
        "listing_id": "item1",
        "brand": "A",
        "price": 270,
        "distance": 12,
        "condition_claim": "good",
        "state": "available",
        "observed": "2026-10-16T18:00:00+08:00"
      },
      {
        "row": "L05",
        "listing_id": "item4",
        "brand": "B",
        "price": 200,
        "distance": 8,
        "condition_claim": "good",
        "state": "sold"
      }
    ]
  }
}