[rt-users] Help with mySQL query to prune RT3 database before upgrading to RT 4.2.5

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Hi,

As I have posted recently, I am working on upgrading our current 
production RT 3.8.1 to RT 4.2.5

I have a working copy of RT 3.8.1 on my test server including a copy of 
our current production database which is over 18 gig of old data.  I 
have imported this database into RT 4 and when I run make 
upgrade-database against the RT4 database, it runs a while and then dies 
with a message that the script was killed.

What I would like to be able to do before our "real" production upgrade 
is to wipeout everything from a given date back, including 
objects/attachments or anything associated with tickets older than 3 
years.  Our current production RT3 database, in all it's glory will be 
archived for posterity.  I was not the original admin of our RT system, 
so I am still on the learning curve and not completely familiar with all 
of the database tables and how they are linked.

Will RT:Shredder do this or do I need to use a custom mysql query to 
catch everything?

Thanks,

Dave