Many artists have 0 merch products because their merch is sold through label mega-stores (Warner Music, Rockabilia, MerchNow, Impericon) rather than individual Shopify stores. Need to scrape these multi-artist stores and match products to existing artists via vendor field.

Need to detect new products on Shopify stores quickly (within 30 minutes) without re-scraping entire catalogs each time. Full re-scrapes are wasteful — most stores don't add products daily.

Need to populate artist merchandise data from official online stores. Most artist stores use Shopify but many URLs are guessed wrong, stores are down, or use non-Shopify platforms. Need a reliable method to test and scrape multiple artist stores efficiently.