Add last seen info to devices table.

This allows us to purge old user_ips entries without having to preserve
the latest last seen info for active devices.

synapse/storage/client_ips.py

@@ -354,6 +354,21 @@ class ClientIpStore(background_updates.BackgroundUpdateStore):
                     },
                     lock=False,
                 )
+
+                # Technically an access token might not be associated with
+                # a device so we need to check.
+                if device_id:
+                    self._simple_upsert_txn(
+                        txn,
+                        table="devices",
+                        keyvalues={"user_id": user_id, "device_id": device_id},
+                        values={
+                            "user_agent": user_agent,
+                            "last_seen": last_seen,
+                            "ip": ip,
+                        },
+                        lock=False,
+                    )
             except Exception as e:
                 # Failed to upsert, log and continue
                 logger.error("Failed to insert client IP %r: %r", entry, e)

synapse/storage/schema/delta/56/devices_last_seen.sql

+/* Copyright 2019 Matrix.org Foundation CIC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+-- Track last seen information for a device in the devices table, rather
+-- than relying on it being in the user_ips table (which we want to be able
+-- to purge old entries from)
+ALTER TABLE devices ADD COLUMN last_seen BIGINT;
+ALTER TABLE devices ADD COLUMN ip TEXT;
+ALTER TABLE devices ADD COLUMN user_agent TEXT;