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Marketplace Research Quality Manual
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== Deduplication == * Primary key: canonical product URL or marketplace item id. * Secondary key: marketplace + normalized title + brand/model + seller/item id. * Variant handling: if color/size/package changes the SKU, keep variants separate only when the user's criteria require it; otherwise group variants under one product family. * Duplicate rows do not count as additional category coverage. * When multiple agents find the same item, preserve all source attributions and share row-level quality responsibility.
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