Exchange rate emergency fix

[matmair]

This PR switches the default exchange backend to frankfurter.app
Closes #5631

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[matmair]

This can only be merged after #5628

[SchrodingersGat]

Nice quick patch, very much appreciated :)

[wolflu05]

Maybe we should make this API url configurable, and default to frankfurter. That way ppl can host their own currency api server if they want to.

[SchrodingersGat]

Maybe we should make this API url configurable, and default to frankfurter. That way ppl can host their own currency api server if they want to.

I like the idea of adding more options - as a future PR. The focus here should be on getting this merged in ASAP.

For future reference, I would like to see:

• Different backends supported (with potential for users to supply API keys if they have them)
• Allow exchange rates to be edited manually (no external updates)
• Potentially custom plugins can be used to fetch exchange rates

[SchrodingersGat]

@matmair any chance to look at the errors here? Would be great to release this one ASAP

[SchrodingersGat]

@matmair very nice work. Are there any references in the documentation to the exchange rate system? If not, we should probably add something (in a separate PR)

[github-actions]

💔 All backports failed

Status	Branch	Result
❌	0.12.x	Backport failed because of merge conflicts You might need to backport the following PRs to 0.12.x: - Email fix (#5396)

Manual backport

To create the backport manually run:

backport --pr 5632

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details

[SchrodingersGat]

Backport to stable branch - #5650

[matmair]

@SchrodingersGat none that I am aware of.