Delete the database folder and start the wallet again.

Will supernova ever be back up?

Hi. Don't worry. There is no fork.
What you refer to is that the pool is continously calculate/estimate how many shares it normally need to find a block. And due to that there has been a lot of changes in the network according hashrate and luck of finding the blocks, the pool will get "rare" estimate and real values of estimate share due to the adaption time of the new "PoW PoS" blocks rule (because that the calculations use "old" data/values to estimate the future). After a while it will then start to show more correct.

BTW: TrasMaMod XMG pool will continoue to keep the limit of 300KH/s to create the posibility for everyone participating the pool to get a good part of the block reward, even for small miners.
Everyone is welcome to TrasMaMod XMG pool as long they respect the 300KH/s limit.

it would be nice. 
in OP there is no link to MAGI`s telegram group

Might be a good option to add it.

Depending on what sort of pool you want to setup, all lot of info is available on github pages of for example mpos and unomp. Takes a little knowledge of coding and time to test and setup. It's no plug and play software like you can download from Google play.

I tend to learn better through doing so that sounds good.  This is more of a private thing to play around with and I have no intentions of making a public pool.  Do you have any specifics to look at first?

Thank you!