I used this module https://github.com/umotif-public/terraform-aws-rds-aurora/blob/master/main.tf
line 391 create auto-scaling of aurora rds
But the autoscaled instance state is not maintained by terraform and deleting the autoscale resource didn't work
Error message: Error: error deleting RDS Cluster InvalidDBClusterStateFault: Cluster cannot be deleted, it still contains DB instances in non-deleting state. status code: 400, request id: b62f33ee-57d8-4887-9cad-3cbf6229b4ac
Error: Error deleting DB parameter group: InvalidDBParameterGroupState: One or more database instances are still members of this parameter group my-parameter-group, so the group cannot be deleted status code: 400, request id: 8a501e66-39e5-4365-ba33-7667894b9cf6
Cheers!