Parse a line from database
        :param line: line to parse

def parse_line(self, line: str):
        """
        Parse a line from database
        :param line: line to parse
        """
        for i in KEYPAIR_RE.finditer(line):
            key = i.group(1)
            value = urllib.parse.unquote(i.group(2))
            self[key] = value