Firstly - great work - one of my favourite games is Chronicles of Crime and this immediately made me think back to how I would've gone about investigating some of those stories using SQL.

w.r.t the comments - you can add `--` to comment out lines of queries but when I do it on two or more lines they get mashed into a single line and I can't reliably uncomment them again without the queries getting mangled.

I've found you can use multiline comments /* and */ though which worked for me - just a bit more back and forth on the keyboard.

Anyway - again - awesome work.