@defer.inlineCallbacks
    def insert_client_ip(self, user, access_token, ip, user_agent):
        now = int(self._clock.time_msec())
        key = (user.to_string(), access_token, ip)

        try:
            last_seen = self.client_ip_last_seen.get(key)
        except KeyError:
            last_seen = None

        # Rate-limited inserts
        if last_seen is not None and (last_seen - now) < LAST_SEEN_GRANULARITY:
            defer.returnValue(None)

        self.client_ip_last_seen.prefill(key, now)

        # It's safe not to lock here: a) no unique constraint,
        # b) LAST_SEEN_GRANULARITY makes concurrent updates incredibly unlikely
        yield self._simple_upsert(
            "user_ips",
            keyvalues={
                "user_id": user.to_string(),
                "access_token": access_token,
                "ip": ip,
                "user_agent": user_agent,
            },
            values={
                "last_seen": now,
            },
            desc="insert_client_ip",
            lock=False,
        )
dataset/ETHPy150Open matrix-org/synapse/synapse/storage/__init__.py/DataStore.insert_client_ip/swapped operands of `-`