Add indices to improve messages_on_delete trigger

ts/sql/migrations/1090-message-delete-indexes.ts

@@ -0,0 +1,32 @@
+// 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 = 1090;
+
+export function updateToSchemaVersion1090(
+  currentVersion: number,
+  db: Database,
+  logger: LoggerType
+): void {
+  if (currentVersion >= 1090) {
+    return;
+  }
+
+  db.transaction(() => {
+    db.exec(`
+      CREATE INDEX reactions_messageId
+        ON reactions (messageId);
+    
+      CREATE INDEX storyReads_storyId
+        ON storyReads (storyId);
+    `);
+  })();
+
+  db.pragma('user_version = 1090');
+
+  logger.info('updateToSchemaVersion1090: success!');
+}