docs: def uri(self):
          """
          Return sqlalchemy connect string URI.
          """
          return self.uri_template.format(
              host=self.host,
              port="" if self.port is None else self.port,
              database=self.database,
              username=self.username,
              password="" if self.password is None else self.password,
              has_password="" if self.password is None else ":",
              has_port="" if self.port is None else ":",
          )