In theory the data you need is stored in the orders tables following each order so it should not be a problem deleting products that you sold ...
However, anything related to reporting that is pulling data from the products tables will be effected ...
If the reports, displays, etc. are only referencing the orders tables, then again, you are fine to delete the product itself ...
Another way to manage this is to set the products_status to 0 so it does not show in the catalog but you retain the information in the admin ...
Linda McGrath
If you have to think ... you haven't been zenned ...
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