مبرمج Backend وصاحب خبرة في AWS

I have an app available on both the App Store and Android platforms, which provides audio and text versions of books. Subscribers can read and listen to books through the app. We use an admin panel to upload books, making them accessible in the app.

Recently, we encountered a problem with the backend where the app suddenly stopped displaying content. The app only shows content that was previously stored, but it no longer displays any new content. While all the previously uploaded content is still visible in the admin panel, any new books we upload will show the book information, but the actual content—such as the cover, audio, and text—does not load.

This issue began after we hired a backend developer to extract additional user data that wasn't visible in the admin panel. The developer restarted the AWS EC2 instances during troubleshooting, which is when the problem occurred. It's been several days now, and we're urgently looking for a solution as the app is live.

Based on this information, could you provide your insight into what might be causing the issue, how we can fix it, and an estimated timeline for resolution?