Create the new index CONCURRENTLY

Author: sandhose

crates/storage-pg/migrations/20251121145458_user_registration_upstream_oauth_session.sql

@@ -8,6 +8,3 @@ ALTER TABLE user_registrations
     ADD COLUMN upstream_oauth_authorization_session_id UUID
       REFERENCES upstream_oauth_authorization_sessions (upstream_oauth_authorization_session_id)
       ON DELETE SET NULL;
-
-CREATE INDEX user_registrations_upstream_oauth_session_id_idx
-    ON user_registrations (upstream_oauth_authorization_session_id);

crates/storage-pg/migrations/20251127145951_user_registration_upstream_oauth_session_idx.sql

@@ -0,0 +1,9 @@
+-- no-transaction
+-- Copyright 2025 New Vector Ltd.
+--
+-- SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+-- Please see LICENSE in the repository root for full details.
+
+-- Index on the new foreign key added by the previous migration
+CREATE INDEX CONCURRENTLY user_registrations_upstream_oauth_session_id_idx
+    ON user_registrations (upstream_oauth_authorization_session_id);