Structurare backend

backend/Core/Entities/Chat.cs

@@ -0,0 +1,22 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Core.Entities
+{
+    public class Chat
+    {
+        public Chat() 
+        {
+            Id = Guid.NewGuid();
+        }
+
+        [Key]
+        public Guid Id { get; private set; }
+        public Guid UserId { get; private set; }
+        public Guid DoctorId { get; private set; }
+        public string? Content { get; private set; }
+
+        public void SetUserId(Guid userId) { UserId = userId; }
+        public void SetDoctorId(Guid doctorId) { DoctorId = doctorId; }
+        public void SetContent(string content) { Content = content; }
+    }
+}