問題情報がADTに上書きされないようにする#1553
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INSERT する前に存在確認を行うことで、UPDATE を無くして既存の問題の情報（contest_id 等）が ADT によって上書きされないようにした。
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fix #1551 #1552
元々、クロールした問題情報をデータベースに入れる処理において、既に同じIDの問題が存在する場合は、新しい方の情報で上書きするという処理になっていました。ADTでは、URLのうち問題IDに使われる部分が出典のABCの問題と全く同じである（例: https://atcoder.jp/contests/adt_all_20260617_2/tasks/abc396_a ）ために、上書き処理が発動したのだと考えます。
PRでは、予め重複確認を行って上書き処理を無くすことで対応しています。すなわち、ある問題IDについて、問題情報は（クローラーから見て）初出のもので固定されるようになります。