Правильный маппинг Adjacency list (JPA)

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
@Entity
@Table(name = "categories")
public class Category {
    private static final String SEQ_NAME = "category_seq";
 
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = SEQ_NAME)
    @SequenceGenerator(name = SEQ_NAME, sequenceName = SEQ_NAME, allocationSize = 1)
    private Integer category_id;
 
    @NotBlank
    private String title;
 
    ????
    private Integer parent_id;

@Table(name = "categories")
public class Category {
 
    private static final String SEQ_NAME = "category_seq";
 
    @Id
    @Column(columnDefinition = "serial")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = SEQ_NAME)
    @SequenceGenerator(name = SEQ_NAME, sequenceName = SEQ_NAME, allocationSize = 1)
    private Long category_id;
 
    @NotBlank
    private String title;
 
    @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
    @JoinColumn(name = "product_id")
    private Set<Product> products;
 
 
    @Null
    @ManyToOne(cascade={CascadeType.ALL})
    @JoinColumn(name="parent_id")
    private Category parent_id;
 
    @NotNull
    private Integer depth;
 
}