Alt db support

[rybit]

- Summary

Create a featureflagged alternate DB connection. Based on the site's host we will choose the right DB to use.

I decided to not use the commons library to keep them separate as much as possible.

I also tried to minimize any large huge changes, just cleaning some warnings when I saw them.

- Test plan

• [ ] add a good unit test
• [ ] deploy to staging and test there

- Description for the changelog

Add the ability to use feature flags from launch darkly and use alternate DB connections