All I know at this point is that the pictures, videos and music that were in my home folders got transmogrified after installing MySQL and restarting.
Pictures are thumbnail quality; e.g., reduced from 68.5 KB (original per d/l file) to 5.1 KB (per "properties").
I'm trying to restore what I can from a backup disk.
I think PostgreSQL gets installed as a dependency with Debian.
I mentioned that PostgrepSQL was not installed in post #14:
I see the amarok setup suggests installing a d/b server such as MySQL or PostgreSQL. These aren't installed on my ETCH distro.
I'm not sure what you want me to understand about it.