Hello Brajesh,

Please can you take a look at this code if its safe to use for auto deleting registered users by roles and time.
Do you see any negative down side to this kind of code
If possible to improve

 function auto_delete_users() {
	global $wpdb;
	$userlevel = 0; //0 = non_active_member // please change with your desired role.
	$deleteafter = 30; //deleter User after X days

	$query = $wpdb->prepare("SELECT $wpdb->users.ID FROM $wpdb->users LEFT JOIN $wpdb->usermeta ON $wpdb->users.ID = $wpdb->usermeta.user_id WHERE $wpdb->usermeta.meta_key = %s AND $wpdb->usermeta.meta_value = %d AND DATEDIFF(CURDATE(), $wpdb->users.user_registered) > %d", $wpdb->prefix.'user_level',$userlevel,$deleteafter);

	if($oldUsers = $wpdb->get_results($query, ARRAY_N)){
		foreach ($oldUsers as $user_id) {
			wp_delete_user($user_id[0]);
		}
	}
}

add_action('daily_clean_database', 'auto_delete_users');

wp_schedule_event(time(), 'daily', 'daily_clean_database');