本番環境などでやらかしちゃった人 Advent Calendar 2025

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Category：Other

Creator：

@sevenc-nanashi

本番環境などでやらかしちゃった人のアドベントカレンダーです。
本番環境にかぎらず検証環境のやらかしでも是非。

さて、2025年ももうそろそろ終わります。来年はやらかさないぞという強い気持ちとともに、そして他の誰かがやらかさないために、みなさんの「やらかし」を共有しましょう。

以下の２点については、記載をお願いします：

その「やらかし」はなぜおきてしまったのか
その「やらかし」を起こさないために次どうすればいか

本番環境などでやらかしちゃった人 Advent Calendar 2024
https://qiita.com/advent-calendar/2024/yarakashi-production

本番環境などでやらかしちゃった人 Advent Calendar 2023
https://qiita.com/advent-calendar/2023/yarakashi

本番環境などでやらかしちゃった人 Advent Calendar 2022
https://qiita.com/advent-calendar/2022/yarakashi-production

本番環境などでやらかしちゃった人 Advent Calendar 2021
https://qiita.com/advent-calendar/2021/yarakashi-production

本番環境などでやらかしちゃった人 Advent Calendar 2020
https://qiita.com/advent-calendar/2020/yarakashi-production

本番環境などでやらかしちゃった人 Advent Calendar 2019
https://qiita.com/advent-calendar/2019/yarakashi-production

How to join the calendar

You can join the calendar by selecting an available date and registering the URL of the article you wish to link to. If a slot is available, you can go back to a past date to join!

Series 1

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@lif_yumumu 客先のDBを間違えて削除した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ryo_s0127 スパゲティプログラムに3行追加したら決済ができなくなった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@waricoma コンセント配線で9万円を無駄にしかけた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@namamurasub メモリをモリモリにした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@iikaiki 客先本番環境のNASデータをすべてrmした事件 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@katohiro_fi ADサーバーが消えた日 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@katokonigiry 完了したと思っていたリプレイスに、ひそんでいた見落とし Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@infinity0206 メールサーバーを爆撃して部門長宛のメールを消失させた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tampopo256 コードミスで自社メールサーバーを受信不能にした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@piepie1231 何か書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@okakajp_25 本番と開発を間違えた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nekihcom 思い込みが招いたサービス稼働停止 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kaizen_nagoya A story about messing up in production environment. Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@nfujita55a プログラムに1文字加えて本番環境のバッチ処理を4倍遅くした Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@majp_tv 数百万の違約金!?「絶対停止できない」システムを止めた顛末 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kako-jun 誤ったバイブコーディングでOSSが3ヶ月停滞したので、リブートで復活させた全記録 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@MaseBB 間違って電源ぶち抜いてしまい、学園祭の全配信システムを止めた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@harumaki2000 操作ミスでめちゃくちゃになり、最終的にサ終した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Ayahira_0319 自分で作ったSNSを自分で壊した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@papillon おきのどくですがファイルシステムはきえてしまいました Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@Tatsu1567 思い出の詰まった大学サークルの記録DBをバックアップ取らずに全消しした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ocnito 他社の本番環境で署名検証がすり抜けクビになった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kizuki1749 「実家Wi-Fi、毎日落ちる。」――実家ネットワークを“やらかし本番環境”化した中学生時代の話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@mpcode_dev 他人が使うソフトを人生で初めて構築してとんでもないトラブルを2つも起こしてしまった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@sevenc-nanashi うっかりミスでアクティブユーザー1万人超えのサービスをサ終させた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@lif_yumumu
客先のDBを間違えて削除した話
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@ryo_s0127
スパゲティプログラムに3行追加したら決済ができなくなった話
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@waricoma
コンセント配線で9万円を無駄にしかけた話
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@namamurasub
メモリをモリモリにした話
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@iikaiki
客先本番環境のNASデータをすべてrmした事件
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@katohiro_fi
ADサーバーが消えた日
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@katokonigiry
完了したと思っていたリプレイスに、ひそんでいた見落とし
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@infinity0206
メールサーバーを爆撃して部門長宛のメールを消失させた話
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@tampopo256
コードミスで自社メールサーバーを受信不能にした話
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@piepie1231
何か書きます
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@okakajp_25
本番と開発を間違えた話
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@nekihcom
思い込みが招いたサービス稼働停止
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@kaizen_nagoya
A story about messing up in production environment.
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@nfujita55a
プログラムに1文字加えて本番環境のバッチ処理を4倍遅くした
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@majp_tv
数百万の違約金!?「絶対停止できない」システムを止めた顛末
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@kako-jun
誤ったバイブコーディングでOSSが3ヶ月停滞したので、リブートで復活させた全記録
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@MaseBB
間違って電源ぶち抜いてしまい、学園祭の全配信システムを止めた話
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@harumaki2000
操作ミスでめちゃくちゃになり、最終的にサ終した話
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@Ayahira_0319
自分で作ったSNSを自分で壊した話
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@papillon
おきのどくですがファイルシステムはきえてしまいました
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@Tatsu1567
思い出の詰まった大学サークルの記録DBをバックアップ取らずに全消しした話
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@ocnito
他社の本番環境で署名検証がすり抜けクビになった話
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@kizuki1749
「実家Wi-Fi、毎日落ちる。」――実家ネットワークを“やらかし本番環境”化した中学生時代の話
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@mpcode_dev
他人が使うソフトを人生で初めて構築してとんでもないトラブルを2つも起こしてしまった話
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@sevenc-nanashi
うっかりミスでアクティブユーザー1万人超えのサービスをサ終させた話
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Series 2

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@ayane0857 ユニプロ鯖で盛大にやらかした話とその教訓 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ajisai_engineer タッチパッドの誤操作で、不要なデータを移行しかけた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nagashi_ma_w 間違えて顧客の本番webサーバーを止めちゃった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@zzzzico システム再起動で起動しなくなった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@LearWisteria Slaveに更新クエリを投げてしまった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tampopo256 サービスの本番データベースを吹き飛ばした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@add2 新卒時代にSTG環境のサーバログをふっとばした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@lovablepleiad LBを再起動して客先のネットワークを止めた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@xx_mana 設定ファイルの変更を横着して、普段と違うテキストエディタを使った結果 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@evakichi だれだれ？俺だ(った)よ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@poropinai1966 最速復旧を実現し続けていた後輩 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tekun0701 本番環境のデータベースを誤って消しそうになった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@KMKZ その日、なぜお客様のサーバーは止まってしまったのか Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@nprimem 開発者ツールでテストしたら本番環境だった話〜不正入力とバリデーションの大事さ〜 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@udon_jihanki 本番サーバー数10台を空っぽにしちゃった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@umeyon Apacheを2.2から2.4にバージョンアップしたら、Requireディレクティブでも、BASIC認証が適用されなくなってしまってた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@yaju 余裕だったはずの採番が最大値に到達してしまった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@KoheiKushida 「今日ネットワークめっちゃ重くない？」の真犯人は私だった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kotmyn0812 消費税対応をミスって会社の売上を飛ばしかけた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kizawa2020 恐怖！どんどん消えていくファイル達とトドメを刺した私 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@Takabatake_Y `sudo chmod -R 777 /` Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@yousaku AWSリソース操作でやらかしちゃった話しと学び Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@inorin__62 資材レビューのつもりが業務影響につながった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@yanbaru 卒業発表2週間前に研究データが2回消えかけた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@shota0616 たった1行のSELECT文でシステムを停止しかけた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@ayane0857
ユニプロ鯖で盛大にやらかした話とその教訓
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@ajisai_engineer
タッチパッドの誤操作で、不要なデータを移行しかけた話
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@nagashi_ma_w
間違えて顧客の本番webサーバーを止めちゃった話
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@zzzzico
システム再起動で起動しなくなった話
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@LearWisteria
Slaveに更新クエリを投げてしまった話
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@tampopo256
サービスの本番データベースを吹き飛ばした話
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@add2
新卒時代にSTG環境のサーバログをふっとばした話
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@lovablepleiad
LBを再起動して客先のネットワークを止めた話
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@xx_mana
設定ファイルの変更を横着して、普段と違うテキストエディタを使った結果
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@evakichi
だれだれ？俺だ(った)よ
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@poropinai1966
最速復旧を実現し続けていた後輩
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@tekun0701
本番環境のデータベースを誤って消しそうになった話
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@KMKZ
その日、なぜお客様のサーバーは止まってしまったのか
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@nprimem
開発者ツールでテストしたら本番環境だった話〜不正入力とバリデーションの大事さ〜
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@udon_jihanki
本番サーバー数10台を空っぽにしちゃった話
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@umeyon
Apacheを2.2から2.4にバージョンアップしたら、Requireディレクティブでも、BASIC認証が適用されなくなってしまってた話
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@yaju
余裕だったはずの採番が最大値に到達してしまった話
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@KoheiKushida
「今日ネットワークめっちゃ重くない？」の真犯人は私だった話
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@kotmyn0812
消費税対応をミスって会社の売上を飛ばしかけた話
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@kizawa2020
恐怖！どんどん消えていくファイル達とトドメを刺した私
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@Takabatake_Y
`sudo chmod -R 777 /`
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@yousaku
AWSリソース操作でやらかしちゃった話しと学び
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@inorin__62
資材レビューのつもりが業務影響につながった話
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@yanbaru
卒業発表2週間前に研究データが2回消えかけた話
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@shota0616
たった1行のSELECT文でシステムを停止しかけた話
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Series 3

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@kako-jun ステージング環境の仕組みを知らずに自作SNSを開発してたら、URLを発見されてそのまま本番環境で開発してる話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ysmreg1 godransom というデータベースマルウェアに感染した話（MySQL） Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ysmreg1 ProxmoxでDBをレプリケーションして「全部消した」話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 4 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 5 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 6 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
Join calendar on 7 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 8 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 9 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 10 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 11 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 12 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 13 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
Join calendar on 14 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 15 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 16 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 17 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 18 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@yuito_it_ GitHubの機密情報は消えない！ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 20 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@ayane0857 失敗から学ぶ初心者でもわかるコードの保守性 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y ファイル削除失敗でメールが無限送信された事故 ― 副作用と状態管理の設計の落とし穴 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y SQL Serverでログを縮小しているのにディスクが減らない理由 ― msdb肥大化に気づくまでの話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kyoooohei_y Loggerくらい new でいいでしょ』が客先障害になった話（ASP.NET Core / DI） Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kotauchisunsun 地獄のクローラー運用　～クラウドから自宅物理サーバーへ。しかし～ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@kako-jun
ステージング環境の仕組みを知らずに自作SNSを開発してたら、URLを発見されてそのまま本番環境で開発してる話
Overwrite
Title
URL
You can post either your article on Qiita or your blog post.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
@ysmreg1
godransom というデータベースマルウェアに感染した話（MySQL）
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Title
URL
You can post either your article on Qiita or your blog post.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
@ysmreg1
ProxmoxでDBをレプリケーションして「全部消した」話
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You can post either your article on Qiita or your blog post.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
Join calendar on 4 day
You can also reserve a slot without registering a title or URL.
Title
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Articles to be submitted are welcome on any website as well as on Qiita.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
Join calendar on 5 day
You can also reserve a slot without registering a title or URL.
Title
URL
Articles to be submitted are welcome on any website as well as on Qiita.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
Join calendar on 6 day
You can also reserve a slot without registering a title or URL.
Title
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Articles to be submitted are welcome on any website as well as on Qiita.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
Join calendar on 7 day
You can also reserve a slot without registering a title or URL.
Title
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Articles to be submitted are welcome on any website as well as on Qiita.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
Join calendar on 8 day
You can also reserve a slot without registering a title or URL.
Title
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Articles to be submitted are welcome on any website as well as on Qiita.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
Join calendar on 9 day
You can also reserve a slot without registering a title or URL.
Title
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Articles to be submitted are welcome on any website as well as on Qiita.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
Join calendar on 10 day
You can also reserve a slot without registering a title or URL.
Title
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Articles to be submitted are welcome on any website as well as on Qiita.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
Join calendar on 11 day
You can also reserve a slot without registering a title or URL.
Title
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Articles to be submitted are welcome on any website as well as on Qiita.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
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When you participate, we will assume that you have agreed to the terms of use
Join calendar on 12 day
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Title
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About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
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Join calendar on 13 day
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When you participate, we will assume that you have agreed to the terms of use
Join calendar on 14 day
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When you participate, we will assume that you have agreed to the terms of use
Join calendar on 15 day
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About reserved posting
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Join calendar on 16 day
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Join calendar on 18 day
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@yuito_it_
GitHubの機密情報は消えない！
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When you participate, we will assume that you have agreed to the terms of use
Join calendar on 20 day
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About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
@ayane0857
失敗から学ぶ初心者でもわかるコードの保守性
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About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
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When you participate, we will assume that you have agreed to the terms of use
@kyoooohei_y
ファイル削除失敗でメールが無限送信された事故 ― 副作用と状態管理の設計の落とし穴
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You can post either your article on Qiita or your blog post.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
@kyoooohei_y
SQL Serverでログを縮小しているのにディスクが減らない理由 ― msdb肥大化に気づくまでの話
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You can post either your article on Qiita or your blog post.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
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Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
@kyoooohei_y
Loggerくらい new でいいでしょ』が客先障害になった話（ASP.NET Core / DI）
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@kotauchisunsun
地獄のクローラー運用　～クラウドから自宅物理サーバーへ。しかし～
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Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@lif_yumumu 客先のDBを間違えて削除した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ryo_s0127 スパゲティプログラムに3行追加したら決済ができなくなった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@waricoma コンセント配線で9万円を無駄にしかけた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@namamurasub メモリをモリモリにした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@iikaiki 客先本番環境のNASデータをすべてrmした事件 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@katohiro_fi ADサーバーが消えた日 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@katokonigiry 完了したと思っていたリプレイスに、ひそんでいた見落とし Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@infinity0206 メールサーバーを爆撃して部門長宛のメールを消失させた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tampopo256 コードミスで自社メールサーバーを受信不能にした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@piepie1231 何か書きます Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@okakajp_25 本番と開発を間違えた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@nekihcom 思い込みが招いたサービス稼働停止 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kaizen_nagoya A story about messing up in production environment. Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@nfujita55a プログラムに1文字加えて本番環境のバッチ処理を4倍遅くした Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@majp_tv 数百万の違約金!?「絶対停止できない」システムを止めた顛末 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kako-jun 誤ったバイブコーディングでOSSが3ヶ月停滞したので、リブートで復活させた全記録 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@MaseBB 間違って電源ぶち抜いてしまい、学園祭の全配信システムを止めた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@harumaki2000 操作ミスでめちゃくちゃになり、最終的にサ終した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Ayahira_0319 自分で作ったSNSを自分で壊した話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@papillon おきのどくですがファイルシステムはきえてしまいました Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@Tatsu1567 思い出の詰まった大学サークルの記録DBをバックアップ取らずに全消しした話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ocnito 他社の本番環境で署名検証がすり抜けクビになった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@kizuki1749 「実家Wi-Fi、毎日落ちる。」――実家ネットワークを“やらかし本番環境”化した中学生時代の話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@mpcode_dev 他人が使うソフトを人生で初めて構築してとんでもないトラブルを2つも起こしてしまった話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@sevenc-nanashi うっかりミスでアクティブユーザー1万人超えのサービスをサ終させた話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@lif_yumumu
客先のDBを間違えて削除した話
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@ryo_s0127
スパゲティプログラムに3行追加したら決済ができなくなった話
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@waricoma
コンセント配線で9万円を無駄にしかけた話
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@namamurasub
メモリをモリモリにした話
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@iikaiki
客先本番環境のNASデータをすべてrmした事件
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@katohiro_fi
ADサーバーが消えた日
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@katokonigiry
完了したと思っていたリプレイスに、ひそんでいた見落とし
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@infinity0206
メールサーバーを爆撃して部門長宛のメールを消失させた話
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@tampopo256
コードミスで自社メールサーバーを受信不能にした話
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@piepie1231
何か書きます
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@okakajp_25
本番と開発を間違えた話
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@nekihcom
思い込みが招いたサービス稼働停止
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@kaizen_nagoya
A story about messing up in production environment.
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@nfujita55a
プログラムに1文字加えて本番環境のバッチ処理を4倍遅くした
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@majp_tv
数百万の違約金!?「絶対停止できない」システムを止めた顛末
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@kako-jun
誤ったバイブコーディングでOSSが3ヶ月停滞したので、リブートで復活させた全記録
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@MaseBB
間違って電源ぶち抜いてしまい、学園祭の全配信システムを止めた話
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@harumaki2000
操作ミスでめちゃくちゃになり、最終的にサ終した話
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@Ayahira_0319
自分で作ったSNSを自分で壊した話
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@papillon
おきのどくですがファイルシステムはきえてしまいました
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@Tatsu1567
思い出の詰まった大学サークルの記録DBをバックアップ取らずに全消しした話
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@ocnito
他社の本番環境で署名検証がすり抜けクビになった話
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@kizuki1749
「実家Wi-Fi、毎日落ちる。」――実家ネットワークを“やらかし本番環境”化した中学生時代の話
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@mpcode_dev
他人が使うソフトを人生で初めて構築してとんでもないトラブルを2つも起こしてしまった話
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@sevenc-nanashi
うっかりミスでアクティブユーザー1万人超えのサービスをサ終させた話
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You can increase the number of series when Calendar 3 is filled with more than 10 articles.

本番環境などでやらかしちゃった人 Advent Calendar 2025

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