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based on what I saw with terraform examples it is a manual setup of replica configuration such as https://github.com/google-terraform-modules/terraform-google-cloudsql-ha/blob/master/main.tf

@some-waitress-78905, @important-leather-28796 I think you just want to use

REGIONAL

availability type: https://www.terraform.io/docs/providers/google/r/sql_database_instance.html#availability_type

Thanks @gifted-island-55702 - I had that in my notes but it is only for postgres unfortunately