Relationship unique key required

안녕하세요. 질문이 있습니다.
노드에는 nodekey가 있듯이, relationship에는 유니크 키가 없나요?
Relationship에도 유니크 키를 줄 수 있다고 생각하는데요.

[Google translation]
Hello. I have a question.
Just as nodes have nodekey, relationships don't have unique keys?
I think you can give a unique key to a relationship as well.
What do you think?

Relationship indexes are relatively new, and are a precondition for any relationship uniqueness constraints. Now that we have those indexes, these are a possibility.

I agree that these would be useful, I think we already have the suggestion on our backlog.

Hello, What does backlkog mean?
I don't know

It's like a to-do list. At the least, it's a list of enhancements to consider for later.

빨리 개발되었으면 좋겠네요. 저의 질문에 관심가져주셔서 감사합니다.
그런데 한가지 질문이 더 있습니다.
저는 계층형 알고리즘을 사용해야되는데, 아직까지 R처럼 패키지가 많지 않습니다. 누구에게 부탁을 드려야할까요?
[Google Translation]
I hope it will be developed sooner. Thank you for your interest in my question.
But I have one more question.
I have to use a hierarchical algorithm, which doesn't have as many packages as R yet. Who should I ask?

[Reference]
https://www.jstatsoft.org/article/download/v038i08/445