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Where do you see `resource_name` documened? I see only `identifier`

Ah, it's the python 1st arg. resource_name is the (prefix of the) name of the ClusterInstance resource. identifier is the id of the RDS instance.

identifier is an args property: it goes to AWS. resource_name is not, it's the Pulumi name and stays only in state.

<@U05CB9CQRNZ> Please be careful with the resource_name, changing it could force the RDS instance creation as well.