refactor and add outlet product table

internal/entities/product_outlet_price.go

@@ -0,0 +1,31 @@
+package entities
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type ProductOutletPrice struct {
+	ID        uuid.UUID `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
+	ProductID uuid.UUID `gorm:"type:uuid;not null;index" json:"product_id"`
+	OutletID  uuid.UUID `gorm:"type:uuid;not null;index" json:"outlet_id"`
+	Price     float64   `gorm:"type:decimal(10,2);not null" json:"price"`
+	CreatedAt time.Time `gorm:"autoCreateTime" json:"created_at"`
+	UpdatedAt time.Time `gorm:"autoUpdateTime" json:"updated_at"`
+
+	Product Product `gorm:"foreignKey:ProductID" json:"product,omitempty"`
+	Outlet  Outlet  `gorm:"foreignKey:OutletID" json:"outlet,omitempty"`
+}
+
+func (p *ProductOutletPrice) BeforeCreate(tx *gorm.DB) error {
+	if p.ID == uuid.Nil {
+		p.ID = uuid.New()
+	}
+	return nil
+}
+
+func (ProductOutletPrice) TableName() string {
+	return "product_outlet_prices"
+}