- display products list
- display details products
- create a product
- edit a product
- delete a product
- display all stores
- edit a store
- delete a store
- add a price for a product and a store
- edit a price
- delete a price
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display list of products (all products where product minimal stock <= product actual stock and all recurrents products)
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user can select which products he wants to buy and how many of them, total prices for each stores are updated