What's causing [ERROR] Invalid (old?) table or database name 'd:q'? I've two entries in my MariaDB 10.5 error log file last night:
[ERROR] Invalid (old?) table or database name 'd:q'

I've looked at my nginx access log around that time and can't see any unusual entries.  I've searched for that error with the d:q bit and got no hits.  Anyone know what this could be?  Does it suggest my server has been exploited in some way...?
Thanks
The following day I got the same errors at exactly the same time (2am and 2:05am), so looked into it more.
The :q felt like a bit of a clue to me.  I couldn't really understand how I could have accidentally affected MariaDB when (failing) to quit vim... but I went looking in my /var/lib/mysql directory, and sure enough there was an empty directory d:q.  Deleted it and I'm assuming the problem will go away.