getAllStories: Remove nested queries

ts/sql/migrations/1130-isStory-index.ts

@@ -0,0 +1,31 @@
+// 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 = 1130;
+
+export function updateToSchemaVersion1130(
+  currentVersion: number,
+  db: Database,
+  logger: LoggerType
+): void {
+  if (currentVersion >= 1130) {
+    return;
+  }
+
+  db.transaction(() => {
+    // This is to improve the performance of getAllStories
+    db.exec(`
+      CREATE INDEX messages_isStory
+        ON messages(received_at, sent_at)
+        WHERE isStory = 1;
+    `);
+  })();
+
+  db.pragma('user_version = 1130');
+
+  logger.info('updateToSchemaVersion1130: success!');
+}