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Storage: - contacts sled tree: auto-tracked on send/receive - fingerprint, alias, first_seen, last_seen, message_count - history sled tree: all messages stored locally - key: hist:<peer_fp>:<timestamp>:<uuid> for ordered scan - sender, text, is_self, timestamp TUI commands: - /contacts or /c — list all contacts (sorted by most recent) Shows alias, fingerprint, message count - /history or /h — show last 50 messages with current peer - /h <fingerprint> — show history with specific peer Auto-tracking: - On send: touch_contact + store_message (is_self=true) - On receive: touch_contact + store_message (is_self=false) - Both KeyExchange and Message variants tracked Backup: contacts + history included in export_all (encrypted backup). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>