diff --git a/Models/ClientMapper.php b/Models/ClientMapper.php
index 73fc8f8..1863c75 100644
--- a/Models/ClientMapper.php
+++ b/Models/ClientMapper.php
@@ -32,7 +32,7 @@ final class ClientMapper extends DataMapperAbstract
     /**
      * Columns.
      *
-     * @var array<string, array{name:string, type:string, internal:string, autocomplete?:bool, annotations?:array}>
+     * @var array<string, array{name:string, type:string, internal:string, autocomplete?:bool, readonly?:bool, annotations?:array}>
      * @since 1.0.0
      */
     protected static array $columns = [
@@ -42,7 +42,7 @@ final class ClientMapper extends DataMapperAbstract
         'clientmgmt_client_status'     => ['name' => 'clientmgmt_client_status',     'type' => 'int',      'internal' => 'status'],
         'clientmgmt_client_type'       => ['name' => 'clientmgmt_client_type',       'type' => 'int',      'internal' => 'type'],
         'clientmgmt_client_info'       => ['name' => 'clientmgmt_client_info',       'type' => 'string',   'internal' => 'info'],
-        'clientmgmt_client_created_at' => ['name' => 'clientmgmt_client_created_at', 'type' => 'DateTime', 'internal' => 'createdAt'],
+        'clientmgmt_client_created_at' => ['name' => 'clientmgmt_client_created_at', 'type' => 'DateTime', 'internal' => 'createdAt', 'readonly' => true],
         'clientmgmt_client_account'    => ['name' => 'clientmgmt_client_account',    'type' => 'int',      'internal' => 'profile'],
     ];