{
  "dataflows": [
    {
      "name": "orders_clean",
      "stage": "transform",
      "source": {
        "connection_name": "orders_input",
        "table": "orders"
      },
      "transform": {
        "value_rules": [
          {"operation": "trim", "columns": ["category"]},
          {"operation": "case", "columns": ["category"], "mode": "lower"}
        ],
        "select_columns": ["order_id", "category", "amount"]
      },
      "destination": {
        "connection_name": "orders_output",
        "table": "orders",
        "load_type": "overwrite"
      }
    }
  ]
}