aws rds delete-db-instance-automated-backup
Deletes automated backups using the DbiResourceId value of the source DB instance or the Amazon Resource Name (ARN) of the automated backups. AWS CLI reference
2 options Its page in the AWS CLI reference
Options
--db-instance-automated-backups-arnThe Amazon Resource Name (ARN) of the automated backups to delete, for example, arn:aws:rds:us-east-1:123456789012:auto-backup:ab-L2IJCEXJP7XQ7HOJ4SIEXAMPLE.--dbi-resource-idThe identifier for the source DB instance, which can't be changed and which is unique to an Amazon Web Services Region.