Can only update a competition's currency code if there are no unrefunded payments #10497
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Addresses #1356 - in draft because I've asked WCAT if this is something that's still needed.
If this is needed, then I think this implementation may be a bit thin. If we get the mega-edge-case of a user having been over-refunded, and another user still having a not-yet-refunded payment, the total amount paid for a competition will be $0 even though there are still two unresolved payments.
As such, it might be better to
find
a registration with a non-zero sum of itsregistration_payments
Also - it seems like we don't track the overall status of a payment (eg, whether it has been refunded) - we only infer this by summing registration_payments related to a given registration.