add index on sessions(token); fixes #1201

lib/model/migrations/20241001-01-index-on-session-table.js

@@ -0,0 +1,18 @@
+// Copyright 2024 ODK Central Developers
+// See the NOTICE file at the top-level directory of this distribution and at
+// https://github.com/getodk/central-backend/blob/master/NOTICE.
+// This file is part of ODK Central. It is subject to the license terms in
+// the LICENSE file found in the top-level directory of this distribution and at
+// https://www.apache.org/licenses/LICENSE-2.0. No part of ODK Central,
+// including this file, may be copied, modified, propagated, or distributed
+// except according to the terms contained in the LICENSE file.
+
+const up = (db) => db.raw(`
+  CREATE UNIQUE INDEX "sessions_token_index" ON sessions (token);
+`);
+
+const down = (db) => db.raw(`
+  DROP INDEX "sessions_token_index";
+`);
+
+module.exports = { up, down };