{
  "version": 1,
  "entity": { "type": { "constant": "shipment" }, "id_column": "shipment_ref" },
  "event_type": { "from_column": "event_type" },
  "timestamp": { "column": "occurred_at" },
  "event_id_column": "event_id",
  "attributes": [
    { "column": "weight_kg" },
    { "column": "carrier" },
    { "column": "location" },
    { "column": "delay_hours" },
    { "column": "delay_reason" }
  ]
}