anchor.diff:    "timestamp": 1447033291,
     "result": null,
     "user": "admin",
  -  "context_id": null
  +  "context_id": ""
   }
   ```
   
  
positive.code:     "timestamp": 1447033291,
      "result": null,
      "user": "admin",
      "context_id": null
    }
  ]
  ```
  
negative.code:     "timestamp": 1447033291,
      "result": null,
      "user": "admin",
      "context_id": ""
    },
    {
      "id": 1179,
  