Because I was having 'issues' with some alts, I deleted the wtf folder and my cache files. This was a 'good' thing because it solved my problem with some of my alts crashing when I loaded them.
However...
I lost all of my Fishing Buddy history. :(
Not a disaster but certainly an inconvenience.
Hmm... perhaps the files are still loaded in the 'recycled' bin but then I've already started 'new' data and I probably don't want to go to the trouble of merging them (if it is even possible).
Anyway, fishers beware...