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キャッシュに生成日時
created_at
と参照日時reference_at
を追加して、長時間参照されていないレコードを削除するようにしました。
ことわざ「人の噂も七十五日」から75日経過すると削除しますw
このソフトの仕様上、更新される事がないので
良くある更新日時
updated_at
はありません。