# Design a system to manage redundant denormalized data

Canonical URL: <https://datadriven.io/problems/design-a-system-to-manage-redundant-denormalized-data-creat-11601e48>

Domain: Data Modeling · Difficulty: medium

## Problem

Design a system to manage redundant denormalized data. Create a products table with a cached category_name and a separate categories table as the source of truth, plus a sync_log to track when caches were refreshed.

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