Problem

The NRQL interface has confusing command structure and could have better error messages.

Issues Encountered

1. Nested command structure is non-obvious:

# This doesn't work:
$ newrelic-cli nrql "SELECT * FROM Log..."

# Must use:
$ newrelic-cli nrql query "SELECT * FROM Log..."

2. Time range flags vs NRQL syntax confusion:

# Tried (doesn't work):
$ newrelic-cli nrql query "SELECT..." --since 7d

# Must embed in query:
$ newrelic-cli nrql query "SELECT... SINCE 7 days ago"

Proposed Enhancements

1. Accept query as direct argument to nrql subcommand (shortcut for common case)
2. Add --since and --until flags that inject into the NRQL query automatically
3. Better error messages when command structure is wrong: "Did you mean 'nrql query'?"