feat(#884): add X-Idempotent-Replayed header to idempotency middleware#978
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ogazboiz merged 1 commit intoMay 28, 2026
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…middleware - Cache hit → X-Idempotent-Replayed: true (alongside existing X-Idempotency-Cache: HIT) - Fresh exec → X-Idempotent-Replayed: false (set before next() so header is present in every response that carries an Idempotency-Key) - Lets the frontend de-duplicate toasts and avoid double-counting without consulting two separate headers - Add two new unit tests asserting both header values - Add docs/wiki/api-idempotency.md documenting both response headers, TTL, cached status-code policy, and a TS usage example
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closes [Backend] Set X-Idempotent-Replayed response header from idempotency middleware #884