Design 47 (Two graphs) keeps each revision as the list of its entries' digests and each entry as one object, so an unchanged entry is stored once. The bucket is declared in the old objects section with a 512 MiB cap (ADR 0619 §2: the indexer is the foundation), opened at its first use; a revision's list is written only after its entries, and a revision read back with an entry lost is an error naming the module. Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ