addSql('ALTER TABLE user ADD username VARCHAR(180) NOT NULL'); $this->addSql('CREATE UNIQUE INDEX UNIQ_IDENTIFIER_USERNAME ON user (username)'); } public function down(Schema $schema): void { // this down() migration is auto-generated, please modify it to your needs $this->addSql('DROP INDEX UNIQ_IDENTIFIER_USERNAME ON `user`'); $this->addSql('ALTER TABLE `user` DROP username'); } }