first commit

Models/ClientDeviceBilling.cs

@@ -0,0 +1,26 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    // Records what an admin actually agreed with a client for their fingerprint/access
+    // device at assignment time (full purchase vs. rental + one-time setup fee).
+    // DevicePricingConfig stays as the admin's reference/default rates; this is per-client.
+    public class ClientDeviceBilling
+    {
+        [Key]
+        public Guid Id { get; set; }
+
+        public Guid FKClientId { get; set; }
+        [ForeignKey("FKClientId")]
+        public virtual Client Client { get; set; }
+
+        public string Mode { get; set; } = "Rental"; // "FullPurchase" | "Rental"
+        public decimal AgreedAmount { get; set; } // full price if FullPurchase, monthly fee if Rental
+        public decimal SetupFee { get; set; } = 0;
+
+        public bool IsActive { get; set; } = true;
+        public DateTime AssignedAt { get; set; } = DateTime.UtcNow;
+        public Guid? AssignedByAdminId { get; set; }
+    }
+}