{
  "title": "Rolling-stock manufacturing data for AI component associations",
  "source_page": "https://fiund.com/industries/rolling-stock-component-association-event-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "An installed serial has a time-bounded car association",
    "context": "Neutral paper railcar records use invented component identifiers. There are no actual systems or safety claims.",
    "records": [
      [
        "1",
        "Monday register",
        "Car C2 paired with module M7."
      ],
      [
        "2",
        "Tuesday event",
        "M7 removed from C2 and logged into store."
      ],
      [
        "3",
        "Wednesday event",
        "M7 assigned to C3; no completed install event."
      ]
    ],
    "question": "Where should M7 appear in a Wednesday installed inventory?",
    "answer": "M7 should not be marked installed on either car in this packet. Record 2 ends the C2 installed interval, while record 3 supports assignment to C3 only. Preserve the prior C2 association and the pending C3 assignment as different event states.",
    "failureModes": [
      "Carrying forward removed equipment",
      "Treating assignment as installed"
    ],
    "fields": [
      [
        "component_serial",
        "Tracks the object across cars"
      ],
      [
        "association_state",
        "Distinguishes installed, stored and assigned"
      ],
      [
        "effective_time",
        "Builds accurate historical snapshots"
      ]
    ],
    "holdout": "Add a completed C3 event and verify it changes only the snapshot after the event.",
    "boundary": "No actual railcar serials, operating or maintenance advice, infrastructure information or safety determinations."
  }
}