Can it batch-process 10,000+ existing products?
Yes, easily. The CLI command (bin/magento panth:image:process --all) iterates your catalogue and pushes one job per image onto the same queue the live observer uses. A single 4-vCPU worker chews through ~700 images / hour with rembg + Pillow; 10,000 images takes ~14 hours overnight. Cost: about $0.40 in compute. If you spin up 4 parallel workers (cheap on Hetzner), that drops to 3.5 hours. Filters available: --since=YYYY-MM-DD, --category-id=N, --sku-pattern=PREFIX-*, --dry-run. Always dry-run first on a small subset (50 SKUs) to confirm output quality before letting it loose on the full catalogue.