TL;DR I suck, database tuned, automation applied.
The longer story: You may have noticed, when attempting to get to the forum, that there were occasionally some errors to the tune of "Error establishing connection to the database." I tossed Chatty on an out-of-the-box install of MySQL (okay, okay, MariaDB. Sheesh.) and left it at that, also sharing the database process with a few other low traffic sites on the same server.
A few things weren't tuned, and oomkiller would handle low memory situations by murdering MySQL. That should, hopefully, be a thing of the past now. Also, I dropped in some automation to handle things just in case there was more murdering, there can also be some resurrecting.
Carry on. (But also nag me if things still don't work)