Add indexes to support messages foreign key constraints

ts/sql/migrations/1120-messages-foreign-keys-indexes.ts

@@ -0,0 +1,33 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { Database } from '@signalapp/better-sqlite3';
+
+import type { LoggerType } from '../../types/Logging';
+
+export const version = 1120;
+
+export function updateToSchemaVersion1120(
+  currentVersion: number,
+  db: Database,
+  logger: LoggerType
+): void {
+  if (currentVersion >= 1120) {
+    return;
+  }
+
+  db.transaction(() => {
+    /** Adds indexes for all tables with foreign key relationships to messages(id) */
+    db.exec(`
+      CREATE INDEX edited_messages_messageId
+        ON edited_messages(messageId);
+
+      CREATE INDEX mentions_messageId
+        ON mentions(messageId);
+    `);
+  })();
+
+  db.pragma('user_version = 1120');
+
+  logger.info('updateToSchemaVersion1120: success!');
+}