lexarks

Hi! I am newbie and I am trying to find a way, to solve my problem. I got shop and I add coupons. Problem is with: discount_coupons_to_products. If I add too many coupons, there is problem with buying. A lot of products, a lot of coupons and it makes a lot of "discount_coupons_to_products" (for example: 10 000 000). When someone is trying to buy product with coupon, there is problem. People can't finish orders. Is there something I can do with it?