curl --request POST \
  --url https://api.prequel.co/import/streams/{id}/test-transform \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "record_ids": [
    "<string>"
  ],
  "stream": {
    "name": "<string>",
    "is_enabled": true,
    "mappings": [
      {
        "field_type": "<string>",
        "target_field": "<string>",
        "column": {},
        "expression": {}
      }
    ]
  }
}
'

{
  "status": "<string>",
  "data": {
    "schema": [
      {
        "name": "<string>",
        "database_type_name": "<string>",
        "length": 123,
        "precision": 123,
        "scale": 123,
        "nullable": true
      }
    ],
    "records": [
      "<unknown>"
    ]
  },
  "message": "<string>"
}