EventType=5 rows are added when you finish a book. As there is one for each book you finish, if you haven't finished one since you lost the stats, there won't be one
But, its a good point about the reading time. It has to be in one of the other events. It might be 3 as that is start a book and from memory the ExtraData looks like a series of timestamps. But there is another pair of events that are open and close a book, they might have the times. Or it might be in a singleton event that has the cumulative details. I have a list of events that I know about at home, and I've posted it in the past, but can't find it. I don't remember one I would have thought held the total time.
As to the checksum, I don't know how to calculate it. I've never really looked into it as I don't even know which columns in the table the checksum is over.
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