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*How do I delete a subnet group which is used by a RDS instance? I got this error for `pulumi destroy`:*

*`Destroying (staging):`*
     *`Type                    Name                    Status                  Info`*
     *`pulumi:pulumi:Stack     myapp-infra-staging  **failed**              1 error`*
 *`-   └─ aws:rds:SubnetGroup  rds-subnet-group        **deleting failed**     1 error`*

*`Diagnostics:`*
  *`aws:rds:SubnetGroup (rds-subnet-group):`*
    *`error: deleting urn:pulumi:staging::myapp-infra::aws:rds/subnetGroup:SubnetGroup::rds-subnet-group: 1 error occurred:`*
        *`* deleting RDS Subnet Group (rds-subnet-group-84e29cf): InvalidDBSubnetGroupStateFault: Cannot delete the subnet group 'rds-subnet-group-84e29cf' because at least one database instance: myapp-staging is still using it.`*
        *`status code: 400, request id: 2d691633-f9eb-4bf9-969c-f4db4ac4ee89`*

  *`pulumi:pulumi:Stack (myapp-infra-staging):`*
    *`error: update failed`*

Try doing a targeted destroy against the database first by passing the urn of the resource in. You can get this by running `pulumi stack -u` and then `pulumi destroy -t resource_urn` 