A Successful YouTube Upload Left No Local Record, Enabling Silent Duplicates

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A developer building an automated YouTube video pipeline discovered a critical flaw where a failed post-upload verification step prevented a local record file from ever being written, even though the video had already been successfully uploaded. Because the duplicate-upload guard relied solely on the existence of that local file, re-running the pipeline would bypass the check entirely and upload the same video a second time. The bug was compounded by a second blind spot: five earlier videos uploaded via a separate tool had never created the required record files, leaving those episodes invisible to the guard from the start. All existing unit tests passed throughout, as none verified the on-disk state left behind after an exception. The root cause was not faulty guard logic but the absence of a shared bookkeeping contract across two independent upload paths.

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