Redshift Snapshot Copy Grants are not currently supported by cloud-nuke. These resources can accumulate from failed or incomplete test runs, eventually hitting the AWS quota limit of 10 grants per region.

When the quota is exceeded, Terraform deployments fail with: SnapshotCopyGrantQuotaExceededFault: Cannot create more than 10 snapshot copy grants.

The resource type is aws_redshift_snapshot_copy_grant in Terraform, and can be listed via aws redshift describe-snapshot-copy-grants. Adding support for nuking these resources would help keep test accounts clean and prevent quota-related failures.