Bulk Image Backfill

What this does: Scans all book products in your catalog that have a cover URL saved but no product image set. For each one it fetches the cover through the proxy and saves it as the Magento product image automatically.

Before running: Make sure cover-proxy.php is installed in your server's /pub/ directory.

This tool is safe to run multiple times — it skips any product that already has an image. It processes one product at a time to avoid server load.