Likely Saturday, 1st of November.
We need to do some server OS upgrades and a some other things that will cause a few hours downtime.
Maybe I will already start with some smaller things this week, that should only cause a short down-time for reboots.
Once that is done, I will look into running a Piefed test instance to investigate how to do the database migration from Lemmy. If everything goes smoothly, we might be able to do the Lemmy to Piefed migration end of this year or early next year.
Hmm on lemmy.ml we dont have such a problem with RAM usage by Postgres. In our case total RAM usage is quite stable with 10 - 16 GB over the past month. Its also strange that restarting Lemmy would solve the problem, I would expect that you have to restart Postgres.
The list of popular communities is only loaded when a new instance is setup for the first time. For existing instances like slrpnk.net it wont be used at all.