There should probably be a special page for merging of items. It should take two identificators and return a new object, possibly after some manual operation on the items.
Version: unspecified
Severity: major
Whiteboard: u=dev p=0 c=backend
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=38790
https://bugzilla.wikimedia.org/show_bug.cgi?id=38795