Deleting a Node using NQuad in Mutation

Hi @zebon43,

Welcome to Dgraph Community !!

I see that you want to use wildcard for objects, predicates.
To to that, you will have to pass this parameter as well to &api.NQuad,

ObjectValue: &api.Value{Val: &api.Value_DefaultVal{DefaultVal: "_STAR_ALL"}} along with passing ObjectId: ""