{
  "name": "user",
  "type": "record",
  "fields": [
    {
      "name": "username",
      "type": "string"
    },
    {
      "name": "email",
      "type": "string"
    },
    {
      "name": "created_at",
      "type": "long",
      "logicalType": "timestamp-millis"
    }
  ]
}