Retructured solution

LiteCharms.Features/Shop/ShoppingCarts/Entities/ShoppingCart.cs

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+using LiteCharms.Features.Shop.Customers.Entities;
+using LiteCharms.Features.Shop.Orders.Entities;
+using LiteCharms.Features.Shop.Quotes.Entities;
+
+namespace LiteCharms.Features.Shop.ShoppingCarts.Entities;
+
+[EntityTypeConfiguration<ShoppingCartConfiguration, ShoppingCart>]
+public class ShoppingCart : Models.ShoppingCart
+{
+    public virtual Customer? Customer { get; set; }
+
+    public virtual Order? Order { get; set; }
+
+    public virtual Quote? Quote { get; set; }
+
+    public virtual ICollection<ShoppingCartItem>? ShoppingCartItems { get; set; }
+
+    public virtual ICollection<ShoppingCartPackage>? ShoppingCartPackages { get; set; }
+}

LiteCharms.Features/Shop/ShoppingCarts/Entities/ShoppingCartConfiguration.cs

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+namespace LiteCharms.Features.Shop.ShoppingCarts.Entities;
+
+public class ShoppingCartConfiguration : IEntityTypeConfiguration<ShoppingCart>
+{
+    public void Configure(EntityTypeBuilder<ShoppingCart> builder)
+    {
+        builder.ToTable(nameof(ShoppingCart));
+
+        builder.HasKey(f =>  f.Id);
+        builder.Property(f => f.CreatedAt).IsRequired().ValueGeneratedOnAdd().HasDefaultValueSql("now()");
+        builder.Property(f => f.UpdatedAt).IsRequired(false);
+        builder.Property(f => f.CustomerId).IsRequired();
+        builder.Property(f => f.OrderId);
+
+        builder.HasOne(s => s.Customer)
+            .WithMany(c => c.ShoppingCarts)
+            .HasForeignKey(s => s.CustomerId)
+            .IsRequired()
+            .OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne(s => s.Order)
+            .WithOne(o => o.ShoppingCart)
+            .HasForeignKey<ShoppingCart>(s => s.OrderId)
+            .OnDelete(DeleteBehavior.SetNull);
+    }
+}

LiteCharms.Features/Shop/ShoppingCarts/Entities/ShoppingCartItem.cs

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+using LiteCharms.Features.Shop.Products.Entities;
+
+namespace LiteCharms.Features.Shop.ShoppingCarts.Entities;
+
+public class ShoppingCartItem : Models.ShoppingCartItem
+{
+    public virtual ShoppingCart? ShoppingCart { get; set; }
+
+    public virtual ProductPrice? ProductPrice { get; set; }
+}

LiteCharms.Features/Shop/ShoppingCarts/Entities/ShoppingCartItemConfiguration.cs

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+using LiteCharms.Features.Shop.Products.Entities;
+
+namespace LiteCharms.Features.Shop.ShoppingCarts.Entities;
+
+public class ShoppingCartItemConfiguration : IEntityTypeConfiguration<ShoppingCartItem>
+{
+    public void Configure(EntityTypeBuilder<ShoppingCartItem> builder)
+    {
+        builder.ToTable(nameof(ShoppingCartItem));
+
+        builder.HasKey(f => f.Id);
+        builder.Property(f => f.CreatedAt).IsRequired().ValueGeneratedOnAdd().HasDefaultValueSql("now()");
+        builder.Property(f => f.UpdatedAt).IsRequired(false);
+        builder.Property(f => f.Quantity).IsRequired().HasDefaultValue(1);
+        builder.Property(f => f.ShoppingCartId).IsRequired();
+        builder.Property(f => f.ProductPriceId).IsRequired();
+
+        builder.HasOne<ShoppingCart>()
+            .WithMany(s => s.ShoppingCartItems)
+            .HasForeignKey(f => f.ShoppingCartId)
+            .IsRequired()
+            .OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne<ProductPrice>()
+               .WithMany()
+               .HasForeignKey(f => f.ProductPriceId)
+               .IsRequired()
+               .OnDelete(DeleteBehavior.Restrict);
+    }
+}

LiteCharms.Features/Shop/ShoppingCarts/Entities/ShoppingCartPackage.cs

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+using LiteCharms.Features.Shop.CartPackages.Entities;
+
+namespace LiteCharms.Features.Shop.ShoppingCarts.Entities;
+
+[EntityTypeConfiguration<ShoppingCartPackageConfiguration, ShoppingCartPackage>]
+public class ShoppingCartPackage : Models.ShoppingCartPackage
+{
+    public virtual ShoppingCart? ShoppingCart { get; set; }
+
+    public virtual Package? Package { get; set; }
+}

LiteCharms.Features/Shop/ShoppingCarts/Entities/ShoppingCartPackageConfiguration.cs

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+namespace LiteCharms.Features.Shop.ShoppingCarts.Entities;
+
+public class ShoppingCartPackageConfiguration : IEntityTypeConfiguration<ShoppingCartPackage>
+{
+    public void Configure(EntityTypeBuilder<ShoppingCartPackage> builder)
+    {
+        builder.ToTable(nameof(ShoppingCartPackage));
+
+        builder.HasKey(f => f.Id);
+        builder.Property(f => f.CreatedAt).IsRequired().ValueGeneratedOnAdd().HasDefaultValueSql("now()");
+        builder.Property(f => f.ShoppingCartId).IsRequired();
+        builder.Property(f => f.PackageId).IsRequired();
+
+        builder.HasOne(f => f.ShoppingCart)
+               .WithMany(s => s.ShoppingCartPackages)
+               .HasForeignKey(scp => scp.ShoppingCartId)
+               .IsRequired()
+               .OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne(f => f.Package)
+               .WithMany()
+               .HasForeignKey(scp => scp.PackageId)
+               .IsRequired()
+               .OnDelete(DeleteBehavior.Restrict);
+    }
+}