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kotlinlang

I found a way to make it work but it feels a bit hakisch to me. I just set the type field to a special `UNKNOWN` value and made the setter private.
```@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
abstract class Credential(
        @ManyToOne
        @JoinColumn
        val account: Account
) {

    @Id
    val id = UUID.randomUUID()

    @Enumerated(EnumType.STRING)
    @Column(name = "DTYPE", insertable = false, updatable = false)
    var type: CredentialType = CredentialType.UNKNOWN
        private set```