Artisan Archive

Hi All

Does anyone know if the commodities such as Steel, Copper, are randomly created when a particular commodity runs out or is the replacement selected from a large pre-existing list. The reason I am asking is because I am considering creating a database of the commodities, but if they are randomly created then this would be a pointless waste of time

I have read somewhere that Holo said some specific resources may VERY RARELY reappear. I'm guessing the resource data base is huge. The idea as I understand it was so that schematics become obsolete. Because of this intention, the repitition of specific resources is not likely.