I'm struggling to understand the traffic trends after the 3490 conversion.

I'm of the understanding that part of the trend files is now stored in the SID folder (The G2S folder no longer being required). If that is the case, why do we still need the DB file (D317400.db) in the SQLite folder. Note, I tried deleting this file and lost the traffic trends on the installed maps section.

The confusion gets worse as D317400.db does not seem to be bundles with 2012.40 Unicode which I believe the 3490 uses?