Migrations will be based on the [From trait](https://doc.rust-lang.org/std/convert/trait.From.html).
It should be implemented on every schema that needs a transition.
It should be implemented for the *reference* of the source
Migration operation will be operated through these couchdb URI:
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For the moment, all the needed struct are to be in the same file.
It is 1 file for 1 db.
@TODO
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