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The used `func(http.ResponseWriter, *http.Request)` return values made
the HTTP handler factory functions quite unreadable. Thus it is switched
to the http.Handler type.
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Reducing global variables makes it easier to understand functions
independently of the rest of the code.
Adding the new model.DB type as a custom variant of the sql.DB type
makes it possible to write methods for the database which makes the code
way more readable.
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Instead a database transaction has to be used. Each database interaction
should be wrapped into a transaction to make sure any possible change
(even side-effects) can be rolled back in case of errors.
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This reflects that these HTTP handler functions implement one of the
four CRUD methods create, read update and delete.
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