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at-least-once-delivery

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A verified .NET 8 reference for DB↔messaging reliability boundaries — transactional outbox, idempotent inbox, SKIP LOCKED multi-worker safety, dead-letter reprocessing — with a deterministic stale-failure write-race case study.

  • Updated Jul 24, 2026
  • C#

Self-hosted webhook router. It verifies signatures, dedupes, persists, and fans events out to many destinations with at-least-once delivery: retries, dead-letter, and replay. FastAPI, async SQLAlchemy, Postgres as the ledger, Redis/SAQ as the executor.

  • Updated Jul 20, 2026
  • Python

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