Check if SKU exists before Adding

[igorsimb]

The flow

• User puts SKUs in the "Добавить новые товары для парсинга" field and clicks Add
• We check if any of these already exist for this user
• If they do, should we:
  • Not count them and then inform the user that these SKUs were not updated and that they can update them in the Manual Update tab?
  • Count them regardless and then inform user about it pos-factum?
  • Warn user beforehand and ask if they can still process the request? (adds complexity in user flow)

I'm not even sure we should implement this in the first place. Reasons:

• If user is parsing 1000 items, we do not want to make them hand-pick out the existing SKUs. Pain in the butt.
• Big load on the server to check every single SKU agains every single user's SKU.