addSql('ALTER TABLE variable_flux DROP INDEX UNIQ_9823D51166D1F9C, ADD INDEX IDX_9823D51166D1F9C (project_id)'); $this->addSql('ALTER TABLE variable_flux CHANGE project_id project_id INT DEFAULT NULL'); } public function down(Schema $schema): void { // this down() migration is auto-generated, please modify it to your needs $this->addSql('ALTER TABLE variable_flux DROP INDEX IDX_9823D51166D1F9C, ADD UNIQUE INDEX UNIQ_9823D51166D1F9C (project_id)'); $this->addSql('ALTER TABLE variable_flux CHANGE project_id project_id INT NOT NULL'); } }