Insert data into the keyword table

        'args' should be a list, but since we can't store a list in an
        sqlite database we'll make it json we can can convert it back
        to a list later.

def _add_keyword(self, collection_id, name, doc, args):
        """Insert data into the keyword table

        'args' should be a list, but since we can't store a list in an
        sqlite database we'll make it json we can can convert it back
        to a list later.
        """
        argstring = json.dumps(args)
        self.db.execute("""
            INSERT INTO keyword_table
                (collection_id, name, doc, args)
            VALUES
                (?,?,?,?)
        """, (collection_id, name, doc, argstring))