diff --git a/src/Database/Model.php b/src/Database/Model.php
index df1def8..7903340 100644
--- a/src/Database/Model.php
+++ b/src/Database/Model.php
@@ -13,7 +13,7 @@
 		public const DATE_FORMAT     = Database::DATE_FORMAT;
 		public const DATETIME_FORMAT = Database::DATETIME_FORMAT;
 
-		abstract public string $id { get; }
+		abstract public mixed $id { get; }
 
 		protected readonly Database $db;
 		private bool $_resolved = false;