anchor.diff:                  "workflow_id": {
                       "component_id": "styx-canary",
                       "id": "StyxCanary"
  -                }
  +                },
  +                "created": "2017-01-01T00:00:00Z",
  +                "last_modified": "2019-01-01T00:00:00Z",
               },
               "statuses": {
                   "active_states": [{
  
positive.code:             "workflow_id": {
                  "component_id": "styx-canary",
                  "id": "StyxCanary"
              }
          }
  
  ### Delete Backfill [DELETE]
  
negative.code:             "workflow_id": {
                  "component_id": "styx-canary",
                  "id": "StyxCanary"
              },
              "created": "2017-01-01T00:00:00Z",
              "last_modified": "2019-01-01T00:00:00Z",
          }
  
  ## Backfill [/{version}/backfills/{backfill_id}{?status}]
  