docs: def delete_sourcesystem_cd(cls, tables: I2B2Tables, sourcesystem_cd: str) -> int:
          """
          Delete all records with the supplied sourcesystem_cd
          :param tables: i2b2 sql connection
          :param sourcesystem_cd: sourcesystem_cd to remove
          :return: number or records that were deleted
          """
          return cls._delete_sourcesystem_cd(tables.crc_connection, tables.observation_fact, sourcesystem_cd)