Right now, the way we create UIDs for meetings and series is not really globally unique. We should use a truly unique identifier and refer to the emitting host name as per the RFC (https://datatracker.ietf.org/doc/html/rfc5545#section-3.8.4.7)

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* Begin of the deletion [ ]End of the deletion Backfill current UIDs for series and one-time meetings Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion * Begin of the deletion [ ]End of the deletion Use a UUID and the host name to create a globally stable UID Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion * Begin of the deletion [ ]End of the deletion Store this UUID in case of future changes with an index for lookup on incoming mails