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feat(api): zero-downtime CHECKIN_ENCRYPTION_KEY rotation - #863
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Adds safe rotation of the check-in encryption key without data loss.
CHECKIN_ENCRYPTION_KEY= current key (all new encryption). OptionalCHECKIN_ENCRYPTION_KEY_PREVIOUS(comma-separated) = decrypt-only fallback.v1.<kid>.<base64(iv|tag|ct)>, kid = 16-hex SHA-256 fingerprint of the key. Legacy bare-base64 rows still decrypt (current, then previous keys; AES-256-GCM auth rejects wrong keys).node dist/jobs/run-checkin-reencrypt.js [--apply] [--batch-size n]: dry-run by default, batched, idempotent, compare-and-set updates, verifies token hash, prints counts only.