build-reports.csv keeps only a single line

[CHN-beta]

I am using the version from current nixpkgs (nixos-unstable branch). I found ~/.cache/nix-output-monitor/build-reports.csv contains a single line even a lot of packages have been built. The line is like:

,gnujump.desktop,0

If I delete the file and rebuild something using nom build .#xxx, the file appears again, but still only contains a single line.

[maralorn]

I am not surprised. Reasonable predictions have been broken on my system as well for quite a while.
We have no reasonable tests for that and its embarrassing. Better handling of this database is high on my list as soon as I have capacity to work on nom again.