Wouldn't be any need to. Just run a SQL query on the database, just deleting entries that had a figure in their dateline column on the infraction table that was between 1104537600 (Unix time for Jan-1-05) and 1136073600 (Unix time for Jan-1-06).
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That would be cool.
I do believe that infractions from mid August 2006 on were also deleted as the first time they did it they deleted all infractions older than X years.
Infractions before mid August 2006 weren't deleted because the infraction system didn't exist ;)