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Has a simple backup and migration workflow. I recently had to backup and migrate a MediaWiki database. It was pretty smooth but not as simple as it could be. If your data model is spread across RDBMS and file, you need to provide a CLI tool that does the export/import.
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Easy to run as a systemd service. This is the main criteria for whether it will be easy to create a NixOS module.
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Has health endpoints for monitoring.
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Has an admin web UI that surfaces important configuration info.
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If there are external service dependencies like postgres or redis, then there needs to be a wealth of documentation on how those integrations work. Provide infrastructure as code examples! IME systemd and NixOS modules are very capable of deploying these kinds of distributed systems.
If you go this route I recommend installing Kodi + Jellyfin Plugin + Kore Android App. You can control everything from your phone or laptop.