@mariash so just to clarify you're thinking that we should expose timestamp and event_timestamp as queryable parameters?  Like this:

```
query_parameters({:timestamp => :event_timestamp}, :event_timestamp, :app_guid)
```
I can do this but I'd think you'd want to keep your public api as clean as possible.  Unless you're thinking you want to migrate the api eventually over to event_timstamp away from timestamp?  Just confirming.

Mike