I can answer some of your questions. There are a LOT of db changes including table additions, movement of columns, new columns, etc. Most, if not all, the changes can be made to your database without impacting your database. There was a new addition to the svn code base that included sql files that made the modifications. You'll need to add in all those changes that have been made from your current rev. The sql files are numbered for the rev that they pertain to. Also, you'll likely need to go through the changelog.txt file between the rev you update to and the rev you are currently on and ensure that you have all the changes. I'm not certain all the database changes were included in the sql files.
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