Recently I noticed a brand new tab of the Records Browser labeled “Analytics Browser”. This is the schema documentation that you can use for building Queries with the N/query module. The Analytics Browser can be accessed through the normal Records Browser, or directly.
This was one of the biggest obstacles I saw to adopting the N/query module more fully, so I am happy to see this reference finally available. It appears to be a vastly different schema than the normal SuiteScript record schema, so it will take a bit of study and adapting, but at least we can get started.