@GeneratedValue
private long id;
@NotNull
private String contentId;
@NotNull
<BUG>private String contributorId;
private String tagLabel;</BUG>
@NotNull
private Timestamp createdAt;
public Tag() {

@GeneratedValue
private long id;
@NotNull
private String contentId;
@NotNull
private String contributorId;
@NotNull
private String tagLabel;
@NotNull
private Timestamp createdAt;
public Tag() {
