addSql('ALTER TABLE customer ADD warning_level VARCHAR(10) DEFAULT NULL'); $this->addSql('ALTER TABLE customer ADD warning_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL'); } public function down(Schema $schema): void { // this down() migration is auto-generated, please modify it to your needs $this->addSql('ALTER TABLE customer DROP warning_level'); $this->addSql('ALTER TABLE customer DROP warning_at'); } }