first commit

Models/CustomerSubItem.cs

@@ -0,0 +1,26 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    public class CustomerSubItem
+    {
+        [Key]
+        public Guid CustomerSubItemId { get; set; }
+
+        public Guid FKCustomerSubscriptionId { get; set; }
+        [ForeignKey("FKCustomerSubscriptionId")]
+        public virtual CustomerSubscription CustomerSubscription { get; set; }
+
+        public string? SubItemName { get; set; }
+        public string? SubItemDescription { get; set; }
+        public decimal SubItemPrice { get; set; }
+
+        // "OneTime" (charged once, e.g. via a supplemental invoice) | "Recurring" (carried
+        // forward onto the invoice each time this subscription renews/upgrades).
+        public string Frequency { get; set; } = "OneTime";
+
+        public bool IsActive { get; set; } = true;
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    }
+}