Standalone Inventory menu program for operators who must keep specific catalog
items out of store-wide special sales. Rows in
pd_special_sales_excluded_products are omitted by
specialSale.php when previewing and creating offers. Operators add
exclusions by exact Product ID or Model Code (a contextual match list appears
only when a typed model is ambiguous), or by selecting products from a
store/category cascade. Existing exclusions can be removed one product at a time.
Product titles join oc_product_description with
language_id = 1.
product_id so re-submitting the same SKU will not raise a unique-key conflict.