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How to Build a Notification System with Sidekiq, Redis and Devise in Rails 6: How to build a real-time notification system. The project is a simple blog with user authentication and the necessary front to display our notifications. We will use Redis to store all of its job and operational data. We are going to save the user who logged in a cookie (it will help us to obtain it from other places, we will see an interesting solution for this problem with Devise using Warden Hooks.