shell> curl -X PATCH --data-binary @- --dump - http://localhost:8529/_api/gharial/social/edge/relation/aliceAndBob
{ 
  "since" : "01.01.2001" 
}

HTTP/1.1 202 Accepted
content-type: application/json
etag: 1581147606

{ 
  "error" : false, 
  "code" : 202, 
  "edge" : { 
    "_id" : "relation/aliceAndBob", 
    "_rev" : "1581147606", 
    "_oldRev" : "1579705814", 
    "_key" : "aliceAndBob" 
  } 
}