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An interrupted blob upload left the blob's chunks, blob_chunks, and blobs rows committed before the upload was attempted, so a later run deduplicated against data that never reached storage and produced a snapshot that reported success but could not be restored. Chosen fix (issue option b): a chunk counts as known only when a blob holding it has uploaded_ts set, and each run drops un-uploaded blob rows and the chunks they orphan at startup, so the affected data is re-chunked and re-uploaded. Option a (withholding all row writes until the upload succeeds) would entangle the packer's writes with upload ordering; gated reads plus a startup repair is smaller and self-healing. Blobs recorded with no remote backend are marked uploaded so the invariant holds uniformly. model: claude-opus-4-8