https://github.com/vergoh/vnstat/tree/sqldb says:
This is the development branch for vnStat 2.0 that uses a sqlite database for storing data instead of a C structure dump in a file. A better database format was needed for enabling longer duration statistics with user configurable durations. Yearly and 5 minute resolution statistics are now included.
It looks like it has features that I really would like, such as forever-durations for logs 
.Anyway, doesn't matter what I like. What I really would like to know is: Is it safe to use this on my lede router? Will it work?