first commit

Models/Staff.cs

@@ -0,0 +1,30 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    public class Staff
+    {
+        [Key]
+        public Guid StaffId { get; set; }
+
+        public Guid FKUserId { get; set; }
+        [ForeignKey("FKUserId")]
+        public virtual User User { get; set; }
+
+        public Guid FKClientId { get; set; }
+        [ForeignKey("FKClientId")]
+        public virtual Client Client { get; set; }
+
+        // Null = no role assigned yet = zero permissions (see PermissionService).
+        public Guid? FKGymRoleId { get; set; }
+        [ForeignKey("FKGymRoleId")]
+        public virtual GymRole? GymRole { get; set; }
+
+        public string? StaffPosition { get; set; }
+        public string? Department { get; set; }
+        public DateTime HireDate { get; set; } = DateTime.UtcNow;
+        public bool IsActive { get; set; } = true;
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    }
+}