The way I see it these are 2 different settings. "Messages to retain when pruning" is what messages to keep when the pruning runs. So 2 weeks would keep only the messages from the last 2 weeks. "Message prune task interval" is what interval between pruning tasks. So if you set 36000 seconds, then th...
No I was just talking in general for my board cleanup instructions. If later an extension comes around that can import data from an old mod you could put those back from backup. It had nothing to do with mChat. Sorry for the offtopic.
There are not many extensions that can import data from previous mods. I know of one, the Gallery mod.
If you have a backup, you could of course put those tables back at a later stage. Now back to mChat