Database disk image is malformed - Error coming from nowhere

This error will popup if the container was a abruptly stopped for any reason - system update, reboot and so on.
The graceful stop is docker stop -t 300 storagenode, by default the daemon is uses a 10 seconds timeout, which is not enough to gracefully stop the storagenode.
You can take a look on this topic to configure your docker daemon:

To fix a malformed database you can use this guide:

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