Support expiry of refresh tokens and expiry of the overall session when refresh tokens are in use.

synapse/storage/schema/main/delta/65/10_expirable_refresh_tokens.sql

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+/* Copyright 2021 The Matrix.org Foundation C.I.C
+ *
+ * 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.
+ */
+
+
+ALTER TABLE refresh_tokens
+  -- We add an expiry_ts column (in milliseconds since the Epoch) to refresh tokens.
+  -- They may not be used after they have expired.
+  -- If null, then the refresh token's lifetime is unlimited.
+  ADD COLUMN expiry_ts BIGINT DEFAULT NULL;
+
+ALTER TABLE refresh_tokens
+  -- We also add an ultimate session expiry time (in milliseconds since the Epoch).
+  -- No matter how much the access and refresh tokens are refreshed, they cannot
+  -- be extended past this time.
+  -- If null, then the session length is unlimited.
+  ADD COLUMN ultimate_session_expiry_ts BIGINT DEFAULT NULL;