Instead of using just strings, this change converts the scopes to a
`StrEnum`, to be compatible with places where a string is expected. This
avoids typos when using these scopes, simplifies searching for usages,
and improves type hints.
An extra change was the fix to the Firmware download endpoint, which
wasn't respecting the `DISABLE_DOWNLOAD_ENDPOINT_AUTH` flag.
According to multiple FastAPI discussions [1], FastAPI only includes a
built-in mechanism to redirect requests including a trailing slash, to
its variation without slash, using a `307` status code.
This can be an issue when certain clients do not send the same headers
on the redirected request.
This change adds a custom FastAPI `APIRouter`, that registers both route
path variations (with and without trailing slash), while only marking
the path without slash for being included in the OpenAPI schema.
[1] https://github.com/fastapi/fastapi/discussions/7298
The current implementation for some of the database handlers, where the
same method is used to retrieve either a single entity (when an `id` is
passed), a list of entities, or `None`, makes the typing and overall
design more complex.
This change simplifies database handlers, by having two separate methods
where appropiate:
* A method that receives an `id`, and returns either an entity, or `None`.
* A method that optionally receives filters, and returns (depending on
the current handler implementation) a list of entities, or a `Select`
object that allows chaining more SQLAlchemy operations.
