addSql('ALTER TABLE trace DROP FOREIGN KEY FK_315BD5A119EB6921'); $this->addSql('ALTER TABLE trace ADD CONSTRAINT FK_315BD5A119EB6921 FOREIGN KEY (client_id) REFERENCES client (id) ON DELETE CASCADE'); } public function down(Schema $schema): void { // this down() migration is auto-generated, please modify it to your needs $this->addSql('ALTER TABLE trace DROP FOREIGN KEY FK_315BD5A119EB6921'); $this->addSql('ALTER TABLE trace ADD CONSTRAINT FK_315BD5A119EB6921 FOREIGN KEY (client_id) REFERENCES client (id)'); } }