First sorry for my english.
I make eer diagram but I want make good optimizzation(I hope).
My project is a comparison price, but need speed, so i start in tables.
For translate in diagram:
prodotti = products
accessori = accessories
produttori = manufacturers
negozi = stores
valuta = currency
prezzi = prices
lingue = languages
utenti = users

I make multi ean because some products have more ean

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For you the db is make good or need some adjustments or is better redo again?