Remnants of an ancient past...
The previous YAPF host server was not under my control, and the admin refused to install postgres. Hence I was forced to use mysql.
Then I changed to the new server, installed postgres, then got pressed for time to port to PG so I just installed MySQL and moved YAPF.
Porting to Postgres is right at the top of my list... get that shitty mysql off my darling server :-)