diff --git a/crates/storage-pg/migrations/20240718075125_sessions_active_index.sql b/crates/storage-pg/migrations/20240718075125_sessions_active_index.sql
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+++ b/crates/storage-pg/migrations/20240718075125_sessions_active_index.sql
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+-- Copyright 2024 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.
+
+
+-- Adds an index on the last_active_at column of the sessions tables
+CREATE INDEX "compat_sessions_last_active_at_idx" ON "compat_sessions" ("last_active_at");
+CREATE INDEX "oauth2_sessions_last_active_at_idx" ON "oauth2_sessions" ("last_active_at");
+CREATE INDEX "user_sessions_last_active_at_idx" ON "user_sessions" ("last_active_at");