i really have 0 clue, but it could be that dgraph has some own nodes for ‘under the hood’ stuff
as long as it doesnt cause any problems i would just leave it be
BTW join our discord Dgraph Users Community (unofficial)
BTW2: maybe you did some stuff with inheritance and so on and that node was created by a parent or smth like that?
edit
maybe youve got the same problem, so here some screenshots of a discussion rn by @droslean and @jdgamble555
