addSql('ALTER TABLE device ADD COLUMN locked_image_id INT DEFAULT NULL'); $this->addSql('ALTER TABLE device ADD CONSTRAINT fk_device_locked_image FOREIGN KEY (locked_image_id) REFERENCES image(id) ON DELETE SET NULL'); } public function down(Schema $schema): void { $this->addSql('ALTER TABLE device DROP CONSTRAINT fk_device_locked_image'); $this->addSql('ALTER TABLE device DROP COLUMN locked_image_id'); } }