code: func (b *DynamoDBBackend) deleteTable(ctx context.Context, tableName string, wait bool) error {
  	tn := aws.String(tableName)
  	_, err := b.svc.DeleteTable(&dynamodb.DeleteTableInput{TableName: tn})
  	if err != nil {
  		return trace.Wrap(err)
  	}
  	if wait {
  		return trace.Wrap(
  			b.svc.WaitUntilTableNotExists(&dynamodb.DescribeTableInput{TableName: tn}))
  	}
  	return nil
  }
docs: // deleteTable deletes DynamoDB table with a given name