@roger.carlson, The URL that you posted to the OMOP CDM GitHub site defaults to the Wiki tab, a.k.a. the “data dictionary”. If you’re looking for the Data Definition Language (DDL) files, you need to navigate to the Code tab: https://github.com/OHDSI/CommonDataModel
@MPhilofsky is correct that the Data Dictionary has moved to https://ohdsi.github.io/CommonDataModel/ but, unfortunately, it is not immediately apparent to the uninitiated that you need to select “CDM v5.3.1” or “CDM v6.0” from the “CDM Versions” menu at the top of the page before you see what you would expect.