I was working in LR when we had an 8 hour power outage. After power resumed LR asked me what country I was in and also required that I load a catalog. Fortunately I save every day so I only lost 30 minutes of edits. The strange thing though is that the color rating disappeared from all my images. Edits and keywords all still intact but no color rating. so my questions are: is it preventable (short of getting a power backup that is), what caused it and is that information recoverable?