Has this ever happened to you??
I've had Lr for years and have never made this mistake. When asked to upgrade current catalog to latest version -instead of selecting yes- I selected "older catalog". That resulted in my active catalog being deleted. Spent 2 hours with Adobe tech support. Was able to select a catalog (not my current one). All folders had a ? next to them. So I then had to sync all folders with those stored on an ext drive.
When completed I discovered that there were no images in catalog from last year and all of this year. We went into the time machine, to a specific date and I was able to see images shot on that date.
HAS THIS HAPPENED TO YOU ????
