Check the validity of a card against the backend regularly

[maxammann]

Is your feature request related to a problem? Please describe.

Disable cards which become invalid because of their expiration date or because they have been revoked, or because the same Anmeldecode was scanned twice.
Check if cards are still valid by verifying them against the backend.

An invalid card should stay in the app but it should be grayed out or a thick text should be displayed above it.

If the card becomes valid again then enable it again.

• Depends on: Verify imported Anmeldecodes #17

Describe the solution you'd like
TBD

Describe alternatives you've considered
None

Additional context
None

[maxammann]

First non-revoked cards will expire probably early 2024.

[maxammann]

@sarahsporck I think you planned to do this feature soon. Better pick some other issue as cards will not be become invalid soon.

[f1sh1918]

Before implementing this feature we need the possibility to revoke cards in the administration, but this was not requested by the customer yet as urgent. It's even not clear if service user can change the expiration date. If not we don't have to check the backend for changes of this field (only revoke)

[michael-markl]

It's even not clear if service user can change the expiration date. If not we don't have to check the backend for changes of this field (only revoke)

Changing expiration date is technically rather infeasible (as the expiration is printed onto the Anmeldecode).
Instead, it should be revoked and a new card should be issued.

Before implementing this feature we need the possibility to revoke cards in the administration, but this was not requested by the customer yet as urgent.

Revoking is not the only "dynamic" invalidation of cards: If you scan the same anmeldecode on another device, the card on the old device also gets invalidated. Hence, this should be taken care of before 2024 imo.