chore: fix product

backend/gestion/db/db_init.go

@@ -152,7 +152,7 @@ func (db *Database) createTables() error {
 		`CREATE TABLE IF NOT EXISTS product_prices (
 			id SERIAL PRIMARY KEY,
 			product_id INTEGER NOT NULL REFERENCES products(id) ON DELETE CASCADE,
-			quantity INTEGER NOT NULL,
+			quantity NUMERIC(10,3) NOT NULL,
 			price NUMERIC(10,2) NOT NULL,
 			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
 			UNIQUE(product_id, quantity)
@@ -211,7 +211,7 @@ func (db *Database) createTables() error {
 			id SERIAL PRIMARY KEY,
 			username VARCHAR(255) NOT NULL,
 			product_id INTEGER NOT NULL REFERENCES products(id) ON DELETE CASCADE,
-			quantity INTEGER NOT NULL,
+			quantity NUMERIC(10,3) NOT NULL,
 			price NUMERIC(10,2) NOT NULL,
 			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 		);`,

backend/gestion/db/db_product.go

@@ -77,7 +77,7 @@ func (db *Database) CreateProduct(product interface{}) error {
 			log.Printf("❌ [DB CreateProduct] Erreur insertion prix[%d]: %v", i, err)
 			return fmt.Errorf("erreur insertion prix: %v", err)
 		}
-		log.Printf("✅ [DB CreateProduct] Prix[%d] inséré: quantity=%d, price=%.2f",
+		log.Printf("✅ [DB CreateProduct] Prix[%d] inséré: quantity=%g, price=%.2f",
 			i, price.Quantity, price.Price)
 	}
 

backend/gestion/db/db_product_price.go

@@ -38,7 +38,7 @@ func (db *Database) GetProductPrices(productID int) ([]models.ProductPrice, erro
 }
 
 // CreateProductPrice ajoute un nouveau prix pour un produit
-func (db *Database) CreateProductPrice(productID, quantity int, price float64) error {
+func (db *Database) CreateProductPrice(productID int, quantity float64, price float64) error {
 	query := `INSERT INTO product_prices (product_id, quantity, price) 
 			  VALUES ($1, $2, $3)`
 	_, err := db.Exec(query, productID, quantity, price)
@@ -49,7 +49,7 @@ func (db *Database) CreateProductPrice(productID, quantity int, price float64) e
 }
 
 // UpdateProductPrice met à jour un prix
-func (db *Database) UpdateProductPrice(priceID, quantity int, price float64) error {
+func (db *Database) UpdateProductPrice(priceID int, quantity float64, price float64) error {
 	query := `UPDATE product_prices SET quantity = $1, price = $2 WHERE id = $3`
 	result, err := db.Exec(query, quantity, price, priceID)
 	if err != nil {