reinstalled the OS, best way to migrate Syncthing?

this isn’t going well…

Ever since my previous post about 48 hours ago, Syncthing has been thrashing its home folder with .db files in tmp-index-sorter folders. See resmon.exe screenshot.

On top of that, there are now thousands of “Out of sync items” on both hosts, and the numbers aren’t shrinking. See webif screenshot.

What should i do ?