- BackupScheduler manages per-device backup goroutines independently from status poll
- First backup uses 30-300s random jitter delay to spread load
- Concurrency limited by buffered channel semaphore (configurable max)
- Per-device Redis lock prevents duplicate backups across pods
- Auth failures and host key mismatches block retries with clear warnings
- Transient errors use 5m/15m/1h exponential backoff with cap
- Offline devices skipped via Redis status key check
- TOFU fingerprint stored on first successful SSH connection
- Config output validated, normalized, hashed, published to NATS
- SSHHostKeyUpdater interface added to interfaces.go
- All 12 backup unit tests pass
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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