Log Book Emptied

guess… if the logbook is gone… it is gone…

Possible you have a save-point on disk and can try to restore the local file… but think more like “no chance”.

These file is stored in the cloud. Interessting posts/thread which discuss the cloud-sync are ( but for another reason ! ) :
for Steam users: Steam - CTD on Startup (after splash screen) - #11 by eaglechlapf6920
form MS-Store users: CTD On StartUp - #8 by Crocodoc584