PostgreSQL Auto-Increment Behavior After Server Restart in Spring Boot

I am using Spring Boot with JPA and PostgreSQL for my application. I have noticed that every time I restart the server, it seems to "skip" 50 IDs for records in a table. For example, if the last record in the table has an ID of 50, when I insert a new record via the API after a server restart, the new record is assigned an ID of 100. However, if I insert records without restarting, it goes to 101, 102, and so on as expected.

I have a base class BaseEntity for my model classes that generates the ID with @GeneratedValue(strategy = GenerationType.AUTO). Hibernate DDL is configured to validate only.

Is there a way to ensure that the auto-increment behavior starts from the last known ID after a server restart, rather than skipping values? Is this related to PostgreSQL’s sequence behavior?

Thank you for your assistance in advance.

Here’s my BaseEntity:

@Getter
@Setter
@MappedSuperclass
public abstract class BaseEntity implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id", nullable = false)
    private Integer id;
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof BaseEntity that)) return false;
        return id.equals(that.id);
    }
    @Override
    public int hashCode() {
        return Objects.hash(id);
    }
    @Override
    public String toString() {
        return "BaseEntity {" +
                "id = " + id +
                "}";
    }
}

I have a second BaseEntity that inserts created_at columns etc… Don’t know if it helps…

@Getter
@Setter
@MappedSuperclass
public abstract class BaseEntityAudit extends BaseEntity implements Serializable {
    private String createdBy;
    private String updatedBy;
    @CreationTimestamp
    @Column(name = "created_at", updatable = false)
    private Date createdAt;
    @UpdateTimestamp
    @Column(name = "updated_at")
    private Date updatedAt;

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof BaseEntityAudit)) return false;
        if (!super.equals(o)) return false;
        BaseEntityAudit that = (BaseEntityAudit) o;
        return createdBy.equals(that.createdBy) &&
                updatedBy.equals(that.updatedBy) &&
                createdAt.equals(that.createdAt) &&
                updatedAt.equals(that.updatedAt);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(),
                createdBy, updatedBy, createdAt, updatedAt);
    }

    @Override
    public String toString() {
        return "BaseEntityAudit{" +
                "createdBy='" + createdBy + ''' +
                ", updatedBy='" + updatedBy + ''' +
                ", createdAt=" + createdAt +
                ", updatedAt=" + updatedAt +
                "} " + super.toString();
    }
}