* chore: Add the SPDX information to each file Add copyright and licensing information as defined in version 3.0 of the REUSE Specification. * tweak format --------- Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
findOneBy
exist
* refactor(backend): 存在確認の`findOneBy`を`exist`に置き換え * cleanup