change revision number in SVN

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http://serverfault.com – I have a system that receives files from clients using svn, and we keep track of revision ID in one of our databases. every year we clear the svn repo, and create new repo as it gets very large size. now how can i preserve the revision id when i create new repo. in other words my repo for this year will reach 20000 revisions. how can i start my new repo from revision id 20001. I hope this can be done (HowTos)