With the latest version in OpenWRT being 1.18, and the vnStat project moving into the 2.x branch over the last year and a half (latest is 2.6), I didn't see a previous thread on whether it will be possible to incorporate this into an upcoming version of OpenWRT.
One major change is "C struct dump database has been replaced with sqlite database," which may have some bearing on if it's practical to do or not.
Right, but there must be a reason that what shows up in Software is <v2 (especially since v2 isn't new). Are we really meant to go outside that walled garden?
The new version 2.x is in master, like anomeome already said above.
It has been added after the 19.07 was branched off June 2019.
The new package has not been backported the old 19.07 series, which still ha just the 1.x vnstat.