Save the session activity in the database

crates/storage-pg/migrations/20230919155444_record_session_last_activity.sql

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+-- Copyright 2023 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.
+
+-- This adds a `last_active_at` timestamp and a `last_active_ip` column
+-- to the `oauth2_sessions`, `user_sessions` and `compat_sessions` tables.
+-- The timestamp is indexed with the `user_id`, as they are likely to be queried together.
+ALTER TABLE "oauth2_sessions"
+    ADD COLUMN "last_active_at" TIMESTAMP WITH TIME ZONE,
+    ADD COLUMN "last_active_ip" INET;
+
+CREATE INDEX "oauth2_sessions_user_id_last_active_at"
+    ON "oauth2_sessions" ("user_id", "last_active_at");
+
+
+ALTER TABLE "user_sessions"
+    ADD COLUMN "last_active_at" TIMESTAMP WITH TIME ZONE,
+    ADD COLUMN "last_active_ip" INET;
+
+CREATE INDEX "user_sessions_user_id_last_active_at"
+    ON "user_sessions" ("user_id", "last_active_at");
+
+
+ALTER TABLE "compat_sessions"
+    ADD COLUMN "last_active_at" TIMESTAMP WITH TIME ZONE,
+    ADD COLUMN "last_active_ip" INET;
+
+CREATE INDEX "compat_sessions_user_id_last_active_at"
+    ON "compat_sessions" ("user_id", "last_active_at");