Category index in Kaltura is defined under partnerSortValue parameter. In Kaltura 9X, this parameter is 0 for a new category and is updated only when moving category in the KMC (changing category order in the categories tree). When deleting category, partnerSortValue does not change for other categories (in the same sub tree of course)
Is it different for Kaltura 10X, or does the Kaltura manage the partnerSortValue value for creating/moving/deleting categories?
Just checked this issue on a newly installed Kaltura Server and the behaviour is the same.