console\migrations\m140702_115933_create_backend_user_table.php

<?php

use yii\db\Expression;
use yii\db\Schema;
use yii\db\Migration;

class m140702_115933_create_backend_user_table extends Migration
{
    public function safeUp()
    {
        $tableOptions = null;
        if ($this->db->driverName === 'mysql') {
            $tableOptions = 'CHARACTER SET utf8 COLLATE utf8_general_ci ENGINE=InnoDB';
        }

        $this->createTable('{{%backend_user}}', [
            'id'            => Schema::TYPE_PK,
            'username'      => Schema::TYPE_STRING . ' NOT NULL',
            'auth_key'      => Schema::TYPE_STRING . '(32) NOT NULL',
            'password_hash' => Schema::TYPE_STRING . ' NOT NULL',
            'email'         => Schema::TYPE_STRING . ' NOT NULL',
            'is_active'     => Schema::TYPE_BOOLEAN . ' NOT NULL',
            'created_by'    => Schema::TYPE_INTEGER,
            'created_at'    => Schema::TYPE_TIMESTAMP . ' NOT NULL',
            'updated_by'    => Schema::TYPE_INTEGER,
            'updated_at'    => Schema::TYPE_TIMESTAMP . ' NOT NULL',
        ], $tableOptions);

        $this->addForeignKey('fk_backend_user_created_by', '{{%backend_user}}', 'created_by', '{{%backend_user}}', 'id');
        $this->addForeignKey('fk_backend_user_updated_by', '{{%backend_user}}', 'updated_by', '{{%backend_user}}', 'id');

        $this->insert('{{%backend_user}}', [
            'id'                   => 1,
            'username'             => 'admin',
            'auth_key'             => Yii::$app->getSecurity()->generateRandomKey(32),
            'password_hash'        => Yii::$app->getSecurity()->generatePasswordHash('admin'),
            'email'                => 'admin@eshop.local',
            'is_active'            => true,
            'created_by'           => null,
            'created_at'           => new Expression('NOW()'),
            'updated_by'           => null,
            'updated_at'           => new Expression('NOW()'),
        ]);
    }

    public function safeDown()
    {
        $this->dropTable('{{%backend_user}}');
    }
}