Changes and fixes

Musify.Backend/Entities/EntityType.cs

@@ -0,0 +1,9 @@
+namespace Musify.Domain.Entities
+{
+    public enum EntityType
+    {
+        User,
+        Track,
+        PlayList
+    }
+}

Musify.Backend/Entities/Upload.cs

@@ -18,6 +18,12 @@ namespace Musify.Domain.Entities
         [Required]
         public required string ContentType { get; set; }
 
+        [Required]
+        public required EntityType EntityType { get; set; }
+
+        [Required]
+        public required Guid EntityId { get; set; }
+
         [Required]
         public UploadState State { get; set; } = UploadState.Pending;