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The v2 poll loop held the session ID in a local variable, so every container restart started a fresh SDK session even though the .jsonl transcript was still sitting in the shared .claude mount. Store it in outbound.db (container-owned, already per channel/thread), seed the loop on startup, clear on /clear, and recover from stale-session errors the same way v1 did. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>