addSql('ALTER TABLE notes DROP FOREIGN KEY FK_11BA68C19EB6921'); $this->addSql('DROP INDEX UNIQ_11BA68C19EB6921 ON notes'); } public function down(Schema $schema): void { // this down() migration is auto-generated, please modify it to your needs $this->addSql('ALTER TABLE notes ADD CONSTRAINT FK_11BA68C19EB6921 FOREIGN KEY (client_id) REFERENCES clients (id) ON UPDATE NO ACTION ON DELETE NO ACTION'); $this->addSql('CREATE UNIQUE INDEX UNIQ_11BA68C19EB6921 ON notes (client_id)'); } }