first commit

Models/StaffPayment.cs

@@ -0,0 +1,22 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    public class StaffPayment
+    {
+        [Key]
+        public Guid Id { get; set; }
+
+        public Guid FKStaffId { get; set; }
+        [ForeignKey("FKStaffId")]
+        public virtual Staff Staff { get; set; }
+
+        public decimal Amount { get; set; }
+        public string? Note { get; set; }
+        public DateTime PaidAt { get; set; } = DateTime.UtcNow;
+
+        // The gym-owner (Client.FKUserId) or staff user who recorded this payment.
+        public Guid FKPaidByUserId { get; set; }
+    }
+}