Okay. I found one where the end wasn't borked. Lost a month of game, but that's not terrible, since they haven't leveled or had major shopping experiences since then. Truly bizarre. The file isn't in a Google Drive/Dropbox folder or anything like that. Super weird. Anyway, thanks for helping me out and for, as a by-product, helping me understand the underlying structure of the FG db.xml and related backup files.