@Entity //ОСНОВНАЯ сущность
@Table(name = "data_collection")
public class DataCollectionEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY, generator = "data_collection_gen")
    @SequenceGenerator(name = "data_collection_gen", sequenceName = "data_collection_sequence", allocationSize = 1)
    private Long id;


    @Enumerated(EnumType.STRING)
    private DataCollectionType type;
    @Column(insertable = false)
    private Date modifiedOn;

    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "template_id", referencedColumnName = "id")
    private TemplateEntity template;

    @OneToMany(
            mappedBy = "data_collection",
            cascade = CascadeType.ALL,
            orphanRemoval = true
    )
    @OrderBy("date DESC")
    private Collection<DataCollectionLogEntity> dataCollectionLog;

//логи основной сущности
@Entity
@Table(name = "data_collection")
public class DataCollectionEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY, generator = "data_collection_gen")
    @SequenceGenerator(name = "data_collection_gen", sequenceName = "data_collection_sequence", allocationSize = 1)
    private Long id;

    private String name;

    private byte[] data;

    private String fileName;

    private String description;

    @Enumerated(EnumType.STRING)
    private DataCollectionType type;
    @Column(insertable = false)
    private Date modifiedOn;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = " author_id")
    private UserEntity author;

    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "template_id", referencedColumnName = "id")
    private TemplateEntity template;

    @OneToMany(
            mappedBy = "data_collection",
            cascade = CascadeType.ALL,
            orphanRemoval = true
    )
    @OrderBy("date DESC")
    private Collection<DataCollectionLogEntity> dataCollectionLog;