{
  "data_kind": "synthetic",
  "description": "Five fabricated records; not collected from any exchange.",
  "rows": [
    {
      "id": "S1",
      "observation_at": "2026-01-01T12:00:00Z",
      "retrieved_at": "2026-01-01T12:00:00.010Z",
      "bid": 99,
      "ask": 101,
      "bid_size": 5,
      "ask_size": 4
    },
    {
      "id": "S2",
      "observation_at": "2026-01-01T12:00:01Z",
      "retrieved_at": "2026-01-01T12:00:01.010Z",
      "bid": 99.9,
      "ask": 100.1,
      "bid_size": 5,
      "ask_size": 4
    },
    {
      "id": "S3",
      "observation_at": "2026-01-01T12:00:02Z",
      "retrieved_at": "2026-01-01T12:00:02.010Z",
      "bid": 101,
      "ask": 100,
      "bid_size": 5,
      "ask_size": 4
    },
    {
      "id": "S4",
      "observation_at": "2026-01-01T12:00:03Z",
      "retrieved_at": "2026-01-01T12:00:03.010Z",
      "bid": null,
      "ask": 101,
      "bid_size": 5,
      "ask_size": 4
    },
    {
      "id": "S5",
      "observation_at": "2026-01-01T12:00:04Z",
      "retrieved_at": "2026-01-01T12:00:04.010Z",
      "bid": 100,
      "ask": 100,
      "bid_size": 5,
      "ask_size": 4
    }
  ]
}