{
  "version": 1,
  "entity": { "type": { "constant": "user" }, "id_column": "user_id" },
  "event_type": { "from_column": "event_type" },
  "timestamp": { "column": "occurred_at" },
  "event_id_column": "event_id",
  "attributes": [
    { "column": "order_value" },
    { "column": "item_count" },
    { "column": "category" },
    { "column": "payment_method" },
    { "column": "channel" },
    { "column": "ticket_topic" },
    { "column": "return_reason" }
  ]
}