{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "MetricColumn",
  "type": "object",
  "description": "A single metric column within a metric group.",
  "properties": {
    "columnName": {
      "type": "string",
      "description": "Name of the metric column."
    },
    "displayName": {
      "type": "string",
      "description": "Human-readable display name."
    },
    "columnType": {
      "type": "string",
      "description": "Data type of the metric column."
    },
    "isKey": {
      "type": "boolean",
      "description": "Whether this column is a key column."
    },
    "unit": {
      "type": "string",
      "description": "Unit of measurement for the metric."
    }
  }
}