4 min read

Backend reliability · Worker correctness

Commit before ack: accepting the duplicate window

Why persistence precedes acknowledgement, which effects a unique key protects, and how real helper-process exits verify the two commit boundaries.

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4 min read

Backend reliability · Durable acceptance

Transactional outbox recovery: close the acceptance gap

The implemented transaction and dispatcher contract for durable acceptance, confirmed publication, and duplicate-safe recovery after a real subprocess exit.

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4 min read

Backend reliability · Capacity and observability

Backpressure under load: bound work before measuring scale

How admission, prefetch, database capacity, and retries interact, with corrected measurements of submission through observed committed results on a local host.

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9 min read

AI infrastructure · Recovery contracts

Deterministic checkpoint recovery: what state must survive?

A code-backed examination of atomic checkpoints, configuration identity, RNG restoration, and the exact-equality test that separates a real restart from a plausible-looking continuation.

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10 min read

Distributed systems · Delivery semantics

Why at-least-once delivery requires an idempotency strategy

A concrete worker contract for stable message identity, durable acceptance, duplicate suppression, bounded retries, and dead-letter handling—grounded in executable Go tests.

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