first commit

Models/ClientInvoice.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    public class ClientInvoice
+    {
+        [Key]
+        public Guid ClientInvoiceId { get; set; }
+        public Guid FKClientSubscriptionId { get; set; }
+        [ForeignKey("FKClientSubscriptionId")]
+        public virtual ClientSubscription ClientSubscription { get; set; }
+
+        public Guid FKUserId { get; set; }
+        [ForeignKey("FKUserId")]
+        public virtual User User { get; set; }
+
+        public int FKClientCardId { get; set; }
+        [ForeignKey("FKClientCardId")]
+        public virtual ClientCard ClientCard { get; set; }
+
+        public decimal Amount { get; set; }
+        // "Pending" | "Partial" | "Paid"
+        public string Status { get; set; } = "Pending";
+        public decimal PaidAmount { get; set; } = 0;
+
+        public DateTime ClientInvoiceDate { get; set; } = DateTime.UtcNow;
+
+        public virtual ICollection<ClientInvoiceItem> Items { get; set; } = new List<ClientInvoiceItem>();
+    }
+}