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You could hook into PrestaShop’s cron system and let a small custom script parse the CSV, match product numbers, then update images and descriptions through the Product API. It ends up being much lighter than building a full interface. I had a similar repetitive task once and, funny enough, while I was using a tool to extract emails from facebook for outreach, I built a quick parser like this on the side and it saved me tons of time.
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You can write a small module that reads the CSV with a cron job, loops through product numbers, then pulls images and descriptions through the core product classes before updating them automatically.