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File rows are shared by every snapshot and updated in place, while a blob row is deleted once no snapshot references it. Removing the newest snapshot, or the prune after an interrupted run, could drop the only blob holding a changed file's current chunks while an older snapshot kept the file row. The next backup compared metadata only, skipped the file, and completed a snapshot that could not restore it. The scanner now loads the IDs of known files that list a chunk no uploaded blob holds and re-chunks them even when their metadata is unchanged. The tests append to a file, so the file keeps its first chunk in a blob the first snapshot still references. Each backup run gets its own snapshot name, so the second-precision snapshot IDs differ without sleeping. Model: opus-5-5