[Refactor]: Notification Streams

[lewislarsen]

Contact Details

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Refactoring Title

Improve notification stream

Refactoring Description

Currently the logic mostly lives in the BackupTask model, which was okay when it was just a couple of notification choices but it's getting pretty unweildly.

In the future this should be addressed and extracted into its own set of classes in the app/Services directory.

Notifications are pretty well tested and that's not an area I'm concerned about, but it could do with some love to make it less messy to work on. There doesn't need to be any change in functionality but I am concerned about the code in the long-term.

Current Issues

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Additional Context

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[lewislarsen]

Will be tackling this in the new year because it's a part of the codebase I'm not happy with.