extern: rename group table
https://gitlab.com/caosdb/caosdb-mysqlbackend/-/issues/27
maybe fix on the go:
https://gitlab.com/caosdb/caosdb-mysqlbackend/-/issues/29
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review and merge !6 (merged)
https://gitlab.com/caosdb/caosdb-mysqlbackend/-/issues/27
maybe fix on the go:
https://gitlab.com/caosdb/caosdb-mysqlbackend/-/issues/29