java——为什么我的实体类在我的表中插入了两个Id？Spring Boot JPA

import javax.persistence.*;
import javax.validation.constraints.Email;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Size;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import java.util.UUID;

@Entity
@Table( name = "users",
        uniqueConstraints = {
                @UniqueConstraint(columnNames = "username"),


        })
@SecondaryTable(name = "user_profile")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)

    private Long id;

    @Column(name = "username")
    @NotBlank
    @Size(max = 20)
    private String username;

    @Column(name = "email", table = "user_profile")
    @NotBlank
    @Size(max = 50)
    @Email
    private String email;

    @NotBlank
    @Size(max = 120)
    private String password;

    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable( name = "user_roles",
            joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "role_id"))
    private Set roles = new HashSet<>();
    
    //getter methods
    //setter methods
    }

import javax.persistence.*;
import java.util.Objects;
import java.util.Optional;
import java.util.UUID;

@Entity
@Table(name = "user_profile")
public class UserProfile {

    @Id
    private Long id;
    @OneToOne(fetch = FetchType.LAZY)
    @MapsId
    private User user;

//    @JoinColumn(name = "email")
//    @OneToOne(fetch = FetchType.LAZY)
//    private User email;


    @Column(name = "profile_img") //S3 image Link
    private String profile_img;

    @Column(name = "profile_banner") //S3 image Link
    private String profile_banner;

//getter methods
//setter methods
}