accessory relationship removed when it still referenced by index

[MinerYang]

Step1 push an image and sign with notation , we will have both accessory relations and reference relations like below

Index(i1)
|__Sig(s1)

Subject(A1)
|__Sig(s1)

Step2 using notation sign same image A1, will index(i1) will be deleted , and having a new index(i1) which contains both Sig(s1) and Sig(s2). While on Harbor UI, we will only have Sig(s2) as accessory of Subject(A1), since the accessory relationship between A1 and Sig(s1) been deleted when delete index(i1), Sig(1) itself still exist.

Index(i2)
|__Sig(s1)
|__Sig(s2)

Subject(A1)
|__Sig(s2)

So, Accessory relationship between A1 and Sig(s1) should still exist while Sig(s1) and A1 haven't been deleted.