---
title: "Inbox and processing deduplication"
description: "How can you discard a duplicate message using a persisted identifier?"
status: "coming-soon"
language: "en"
canonical: "https://bulnik.dev/en/articles/topics/T22.05/"
topicId: "T22.05"
---

> Coming soon — this article is being prepared. Below are its question, intended outcome, and place in the story.

## The question

How can you discard a duplicate message using a persisted identifier?

## What we will work through

Discard a duplicate message using a persisted identifier.

## Before you begin

Previously covered: At-most-once and at-least-once in one scenario; Primary keys and record identity.

- [At-most-once and at-least-once in one scenario](/en/articles/topics/T22.02/)
- [Primary keys and record identity](/en/articles/topics/T39.02/)