Add commit / rollback SQLA on commands which edit the database on harddisk. See https://github.com/google/vizier/issues/1187. Originally executions only occurred in memory but weren't saved to harddisk.

Add commit / rollback SQLA on commands which edit the database on harddisk. See https://github.com/google/vizier/issues/1187. Originally executions only occurred in memory but weren't saved to harddisk. #3398