[FEATURE] Allow for external database options

[krainboltgreene]

Description

Since removing redis as a datastore my company can no longer use hemmelig on on-demand web service providers like Google Cloud Run or AWS Fargate, as the local datastore wont be present on any dynamically spun up instances.

It would be nice to at least allow me to pass in a SQL instance URI to use as the datastore.

Screenshots

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Additional information

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