I would recommend just stopping. I have looked at the event table a lot over the years and posted what I know. But, I have never decoded the contents of the ExtraData column. I can see some things in it, but, not enough to do anything. And, there is also Checksum column. This is a checksum across more than one column in the table. I have no idea how it is calculated, but I know when I have tried fiddling with some of the data, it just didn't work.
If you have a backup of the database, then you can probably restore the data. But, I wouldn't recommend anything else.
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