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Used the existing key-value store to add a per-identifier index for active holds, with add on reserve, remove on release, and pruning of expired entries on read. Enabled single-key lookup without scanning all holds.
Implemented bounded key-pattern scanning over existing stock and hold keys with literal escaping, case handling, result caps, and a separate replica reader. Verified only with an in-memory fake and unit tests, not against a live cluster.
Used as durable backing for the SMS queue, with persistence and a dedicated volume in the compose setup and a real server process for end-to-end checks. Health checks and queued jobs behaved as expected.
Relied on the existing key-value store abstraction for idempotency keys and per-item timestamps behind the webhook replay and staleness guards. Duplicate deliveries applied once in tests.
