Plex Media Server all conversions stuck at "Waiting"

Immediately after posting this, I was planning to post my logs here when I thought I’d take a look at them first. I found the following messages recurring in the log at random intervals:

database disk image is malformed
database corruption at line XXXXX of [xxxxxxxxxx]

That led me to this article from a while ago regarding corrupt databases:

Which led me to restore the database from a backup:

https://support.plex.tv/articles/202485658-restore-a-database-backed-up-via-scheduled-tasks/?_ga=2.87066332.538077081.1537919421-267541892.1416793740

And that seems to have resolved the issue!