anchor.diff:  
   {
     "status": "END",
  -  "id": "571",
  +  "id": "571:53195832",
     "ts_ms": 1486500577691,
     "event_count": 2,
     "data_collections": [
  
positive.code:   "op": "c",
    "ts_ms": "1580390884335",
    "transaction": {
      "id": "571",
      "total_order": "1",
      "data_collection_order": "1"
    }
  
negative.code: For every transaction `BEGIN` and `END`, {prodname} generates an event that contains the following fields:
  
  `status`:: `BEGIN` or `END`.
  `id`:: String representation of the unique transaction identifier composed of Postgres transaction ID itself and LSN of given operation separated by colon, i.e. the format is `txID:LSN`.
  `ts_ms`:: The time of a transaction boundary event (`BEGIN` or `END` event) at the data source.
  If the data source does not provide {prodname} with the event time, then the field instead represents the time at which {prodname} processes the event.
  `event_count` (for `END` events):: Total number of events emmitted by the transaction.
  