# Prevent Duplicate Workflow Executions via Idempotency & Unique Event IDs

**URL:** <https://community.n8n.io/t/prevent-duplicate-workflow-executions-via-idempotency-unique-event-ids/319988>\
**Category:** Built with n8n\
**Tags:** workflow-building\
**Created:** [October 8, 2026, 8:56pm UTC](https://community.n8n.io/t/prevent-duplicate-workflow-executions-via-idempotency-unique-event-ids/319988 "2026-10-08T20:56:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ayub\_Shah](https://dub1.discourse-cdn.com/n8n/user_avatar/community.n8n.io/ayub_shah/32/192228_2.png) [@Ayub\_Shah](https://community.n8n.io/u/Ayub_Shah)\
**Post date:** [October 8, 2026, 8:56pm UTC](https://community.n8n.io/t/prevent-duplicate-workflow-executions-via-idempotency-unique-event-ids/319988/1 "2026-10-08T20:56:32Z")

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Today while helping in the n8n community I noticed many duplicate event issues come from retry behavior rather than logic bugs.

One useful thing to check:

Webhook response timing + unique event IDs.

Synthetic test environment.

Not client work.

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<div class="post-metadata">

**Author:** ![Angelo\_Salvacion](https://dub1.discourse-cdn.com/n8n/user_avatar/community.n8n.io/angelo_salvacion/32/194154_2.png) [@Angelo\_Salvacion](https://community.n8n.io/u/Angelo_Salvacion)\
**Post date:** [October 10, 2026, 2:09am UTC](https://community.n8n.io/t/prevent-duplicate-workflow-executions-via-idempotency-unique-event-ids/319988/2 "2026-10-10T02:09:55Z")

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Hello, do you need help, you can hire me as your part time n8n helper, I built n8n for 2 years dealing API and ids of recipients for both sender and receiver also use with AI. Feel free to contact me on mt email, [angelo.salvacion@gmail.com](mailto:angelo.salvacion@gmail.com).