Delete data or set display to "Inactive"
I've got a question about a best practice for storing historical / reference data in a database.
I'm creating an e-commerce system (online catalog, shopping cart, etc.) with a way of creating arbitrary groupings of products ("Gifts for Mother's Day", etc.) and selecting particular products as "featured".
In both cases, these items will be listed differently: promotional text, a catchy title, a larger or different picture. So I'll have entries in a "promotional_group" table and a "featured_product" table to store the additional text and picture references.
These items will also be temporary; probably not stay around longer than a month, in the case of promotional groups.
I want to keep track of user clicks on these promotional items and relate them specifically to sales. I could statically store the most important fragments of data and delete the temporary promotional group. Or, I could set a display status on the promotional group (setting it to "Inactive" when I'm done with it) and reference the promotional group id with the order, keeping -all- data.
Which option is the "best" way of doing it?