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Server: - Register stores per-device bundles: device:<fp>:<device_id> - GET /v1/keys/:fp/devices lists all registered devices - WS already pushes to ALL connected devices per fingerprint - DB queue: first device to poll gets messages (acceptable for Phase 2) Multi-device flow: - Same seed on two devices → same fingerprint - Both register with different device_ids - Both connect via WS → both receive messages in real-time - Each device maintains its own ratchet sessions Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>