@murgero Thank you
Before seeing this, I decided to be a 'windows user' and reboot the cloudron server.
I guess same effect, but will definitely do your more limited kick next time.
And yes it is working again.
@girish No, I don't have a lot of experience with postgresql. The strategy you describe aligns with my understanding of mysql's philosophy, but postgresql seems to require admins be more explicit. E.g. granting permissions to an arbitrary quoted LIKE pattern is documented in mysql, but postgresql's GRANT docs don't mention anything of the like and look like they require the specific object to exist (by nature of being a valid identifier) before granting permissions. Though I could be mistaken.
I finally managed to get to the bottom of this. There was a bug in the postgresql addon backup logic where connections were not closed properly. This resulted in periodic backups keeping lots of connections open. This is fixed in 6.3.