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Vitor PamplonaandClaude Opus 5
bf99eb740c
Restoring a backup handed back the groups with an empty history. The archive carried the MLS state, the cursor and the key packages but not one message, and the cursor it *did* carry told the sync loop the stream had been read to the end — so the coordinator was never asked to resend them either. Verified on the tablet with a true no-op round trip (export, restore that same file minutes later): both groups came back with names, icons, members and health, and every message gone, still gone after a cold start, and gone from the Messages inbox entirely for want of anything to sort on. That is not what the screen offers. Its first line is that losing the device without a backup loses "everything already said in it", which only reads one way. Archive version 2 adds the delivered messages per group, written as the same JSON the on-disk message log already stores so the two cannot drift. Version 1 files still open, and still restore empty — there is nothing in them to do better with. The import writes the messages back before the cursor is trusted again, because nothing will re-deliver them afterwards. The alternative was to reset the cursor on restore and re-pull from the coordinator, which does hold the complete ordered history. It is cheaper, but it only recovers the epochs the restored state can still open; carrying the plaintext is whole regardless of how often the group has rotated. Vitor picked this one. The "What is in the file" copy now says messages are in there, since that materially changes what the file is worth to whoever finds it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>