@Override
    public Identity<StroomUserGroupRecord, Long> getIdentity() {
        return (Identity<StroomUserGroupRecord, Long>) super.getIdentity();
    }
Create a <code>stroom.stroom_user_group</code> table reference
stroom-security/stroom-security-impl-db-jooq/src/main/java/stroom/security/impl/db/jooq/tables/StroomUserGroup.java