Thanks for the question! Well, production web transaction traces in New Relic are only available to paying customers - and pay you will :).

But also those usually only give you great data about SQL statements or things like this (Application code (in Document#transaction)) which doesn't say much, unless you add more New Relic instrumentation blocks in your code, which then requires a re-deploy.

Also, New Relic dev mode hasn't been updated in a long long time the last time I checked, and it was really buggy in showing you what line of code you were in.