DatasetEntry interface exported

export interface DatasetEntry {
  id: string;
  /** Normalised signals string (label + name + id + placeholder concatenated) */
  signals: string;
  /** Expected field type */
  type: FieldType;
  /** Where this sample came from */
  source: DatasetEntrySource;
  /** Relative difficulty for curriculum tracking */
  difficulty: DatasetEntryDifficulty;
  /** When this entry was created */
  createdAt: number;
}