}
// GetDatasetType returns the type of a dataset
// Returns: (type, exists, error)
func GetDatasetType(db *sql.DB, datasetID string) (string, bool, error) {
	var datasetType string
	err := db.QueryRow("SELECT type FROM dataset WHERE id = ?", datasetID).Scan(&datasetType)
	if err == sql.ErrNoRows {
		return "", false, nil
	}
	if err != nil {
		return "", false, err
	}
	return datasetType, true, nil
}
// ValidateDatasetTypeForImport checks that a dataset is 'structured' type for file imports
// Returns error if dataset doesn't exist or is not 'structured'
func ValidateDatasetTypeForImport(db *sql.DB, datasetID string) error {
	datasetType, exists, err := GetDatasetType(db, datasetID)
	if err != nil {
		return fmt.Errorf("failed to query dataset type: %w", err)
	}
	if !exists {
		return fmt.Errorf("dataset not found: %s", datasetID)
	}
	if datasetType != "structured" {
		return fmt.Errorf("dataset '%s' is type '%s' - file imports only support 'structured' datasets", datasetID, datasetType)
	}
	return nil

	// Verify dataset is 'structured' type (ML selection imports only support structured datasets)
	if err := utils.ValidateDatasetTypeForImport(database, datasetID); err != nil {
		return err
	}

	// Verify dataset is 'structured' type (file imports only support structured datasets)
	if err := utils.ValidateDatasetTypeForImport(database, input.DatasetID); err != nil {
		return err
	}

	// Verify dataset is 'structured' type (file imports only support structured datasets)
	if err := utils.ValidateDatasetTypeForImport(database, input.DatasetID); err != nil {
		return err
	}

**Important**: All import tools only work with datasets of type `'structured'`. Attempting to import to `'unstructured'`, `'test'`, or `'train'` datasets will return a validation error.

- **Dataset type validation for imports**: File imports (import_file, import_audio_files, bulk_file_import, import_ml_selections) only work with datasets of type 'structured'