Request for Continued Sandbox Access and Feature Suggestion

From clay cohort 29 to here, thought I would request to continue for the Sandbox option. Its really helpful, and I have some usecases I would love to try with I love how we can not only save credits, but actually test our "hypothesis" as well. Would love if there was a feature of testing just one row for half a credit, before running for all in the column. But hey just a suggestion!