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<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Migration_Add_username_index extends CI_Migration {
public function up()
{
$this->db->query("
ALTER TABLE `users`
ADD UNIQUE `username` (`username`);
");
}
public function down()
{
$this->db->query("
ALTER TABLE `users`
DROP INDEX `username`;
");
}
}
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