CNAME block list

I am reasonably good in breaking down a problem into the steps, needed to solve the problem, terrible when turning the steps into code (trial and error, using duckduckgo examples to translate a step into code).
This sometimes ends up in simply rebooting, due to a watchdog trigger (max-load-15), or manual intervention if the system is still responsive.
I'm using this to look at the database, but it's a lousy way to apply massive changes (remove all regex entries to avoid falsifying the test result).
I also tried to remove all blocklists (except one) from the database, but failed (timeout). It even looks like you cannot remove a blocklist from the database, only enable/disable it (can you confirm or deny this?).
Anyway, I rebooted, that caused FTL to read (compile).