JackHuman

В общем итоге помогла аннотация @OnDelete. Класс Account не изменял. Код Services:

@MappedSuperclass
abstract public class Services {
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  protected long id;
  @ManyToOne(cascade = CascadeType.REFRESH)
  @JoinColumn(name = "from_account_id")
  @OnDelete(action = OnDeleteAction.CASCADE)
  protected Account fromAcc;
...