How can I alter KWin rules via TTY?

I'm quite new to Linux and managed to screw up my desktop (KDE) royally... I wanted to change my global window transparency and set it to 0% opacity, instead of 0% transparency, as I had intended. I used the procedure described here: [https://userbase.kde.org/Tutorials/Force_Transparency_And_Blur](https://userbase.kde.org/Tutorials/Force_Transparency_And_Blur) Obviously, I cannot take the same route back, because all KDE setting windows ae fully transparent as well. My idea is to remove the rule that I applied manually via TTY. However, I could not find it under ~\.kde4. I also did a restore via timeshift, but that did not help. Apparently the rules are stored somewhere in root or home, because these directories are excluded from the snapshots. Any help is greatly appreciated, because a fully transparent desktop quite impedes productivity.