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Inflow publishes a message id onto the wire, RabbitMQ delivers it, and the subscriber never reads it. The response was a guard that skips deduplication rather than one that reads the id - and the correlation id that does cross is a fresh random Guid.
Inflow's inbox writes a row only after the handler succeeds, which makes its own duplicate-check predicate dead code and its name wrong. It is a good Idempotent Receiver with a one-hour memory, a decorator that resolves from the wrong provider, and an orphaned brace pair.
Every Pacco service that enables Convey's Mongo outbox also sets disableTransactions to true - the aggregate write and the outbox write are separate operations, the pattern's one guarantee switched off in configuration. Meanwhile the inbox that would absorb the resulting duplicates sits beside three handlers that throw on them.
DShop runs competing consumers over an at-least-once bus with no message-id dedup, so a redelivered reservation decrements stock twice - the estate aspires to idempotency and enforces none of it. Part 9 of Nine Services and a Message Bus.
The cross-cutting drawer of FastEndpoints holds a rate limiter that documents its own limitations, idempotency built on output caching, server-sent events - and a full implementation of the x402 micro-payments protocol. Part 16 of FastEndpoints in Depth.
Every five minutes a function hunts for people still virtually swiped in past ten hours and emails them - magic node numbers, an at-most-once flag with a gap in it, and a local config file pointing straight at production.
The leave sync resumes from wherever its own job log last said Success - one table serving as log, watermark and metrics store at once, with recursive pagination on top and an envelope check in exactly the wrong place.
