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

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)