diff --git a/Models/CalendarMapper.php b/Models/CalendarMapper.php
index 8a2008e..655abe9 100644
--- a/Models/CalendarMapper.php
+++ b/Models/CalendarMapper.php
@@ -33,14 +33,14 @@ final class CalendarMapper 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 = [
         'calendar_id'          => ['name' => 'calendar_id',          'type' => 'int',      'internal' => 'id'],
         'calendar_name'        => ['name' => 'calendar_name',        'type' => 'string',   'internal' => 'name'],
         'calendar_description' => ['name' => 'calendar_description', 'type' => 'string',   'internal' => 'description'],
-        'calendar_created_at'  => ['name' => 'calendar_created_at',  'type' => 'DateTime', 'internal' => 'createdAt'],
+        'calendar_created_at'  => ['name' => 'calendar_created_at',  'type' => 'DateTime', 'internal' => 'createdAt', 'readonly' => true],
     ];
 
     /**
diff --git a/Models/EventMapper.php b/Models/EventMapper.php
index ea13397..55d141f 100644
--- a/Models/EventMapper.php
+++ b/Models/EventMapper.php
@@ -29,7 +29,7 @@ final class EventMapper 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 EventMapper extends DataMapperAbstract
         'calendar_event_schedule'    => ['name' => 'calendar_event_schedule',    'type' => 'int',          'internal' => 'schedule'],
         'calendar_event_calendar'    => ['name' => 'calendar_event_calendar',    'type' => 'int',          'internal' => 'calendar'],
         'calendar_event_created_by'  => ['name' => 'calendar_event_created_by',  'type' => 'int',          'internal' => 'createdBy'],
-        'calendar_event_created_at'  => ['name' => 'calendar_event_created_at',  'type' => 'DateTime',     'internal' => 'createdAt'],
+        'calendar_event_created_at'  => ['name' => 'calendar_event_created_at',  'type' => 'DateTime',     'internal' => 'createdAt', 'readonly' => true],
     ];
 
     /**
diff --git a/Models/ScheduleMapper.php b/Models/ScheduleMapper.php
index 3fd5aa7..142f60c 100644
--- a/Models/ScheduleMapper.php
+++ b/Models/ScheduleMapper.php
@@ -29,7 +29,7 @@ final class ScheduleMapper 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 = [
@@ -44,7 +44,7 @@ final class ScheduleMapper extends DataMapperAbstract
         'schedule_start'                  => ['name' => 'schedule_start',                  'type' => 'DateTime', 'internal' => 'start'],
         'schedule_duration'               => ['name' => 'schedule_duration',               'type' => 'int',      'internal' => 'duration'],
         'schedule_end'                    => ['name' => 'schedule_end',                    'type' => 'DateTime', 'internal' => 'end'],
-        'schedule_created_at'             => ['name' => 'schedule_created_at',             'type' => 'DateTime', 'internal' => 'createdAt'],
+        'schedule_created_at'             => ['name' => 'schedule_created_at',             'type' => 'DateTime', 'internal' => 'createdAt', 'readonly' => true],
         'schedule_created_by'             => ['name' => 'schedule_created_by',             'type' => 'int',      'internal' => 'createdBy'],
     ];