Можно ли добавить произвольное поле в класс @Entity?

@Entity
@Table(name = "profile", schema = "webmaster")
public class Webmaster extends Profile {

  @Id
  @GeneratedValue
  @Column(name = "id")
  protected Integer id;

  @Column(name = "balance")
  Integer balance;

  @Column(name = "hash")
  String hash;

  @Column(name = "currency")
  String currency;

  @Column(name = "status")
  String isActive;

  @Column(name = "title")
  String title;

  @Column(name = "purse")
  String purse;

  private double balanceChange;

  public Webmaster() {
  }