應用程序和歷史有OneToMany：@Entity@Table(name = "app")@SuppressWarnings("serial")public class App implements Serializable {    @Id     @Column(name = "app_id")    @GeneratedValue(strategy = GenerationType.AUTO)    private Long appId;    private String name;    @OneToMany(fetch = FetchType.LAZY, mappedBy = "app", cascade = CascadeType.PERSIST)    private Set<History> history = new HashSet<>();    //get.set}@Entity@Table(name = "app_history")@SuppressWarnings("serial")public class History implements Serializable {    @Id    @Column(name = "history_id")    @GeneratedValue(strategy = GenerationType.AUTO)    private Long historyId;    @JoinColumn(name = "appId")    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.REFRESH)    private App app;    //get.set}在日志中看到：create table app (app_id int8 not null, name varchar(255), primary key (app_id))create table app_history (history_id int8 not null, app_id int8, primary key (history_id))alter table app_history add constraint FKeuk3km6r7oklj5xc1ecwvxmkm foreign key (app_id) references app期望上面的行是alter table app_history add constraint FKeuk3km6r7oklj5xc1ecwvxmkm foreign key (app_id) references app (app_id)那么，(app_id)當 jpa 嘗試創建表時為什么會丟失？