Optimize loading stories

ts/sql/migrations/70-story-reply-index.ts

@@ -0,0 +1,29 @@
+// Copyright 2021-2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { Database } from 'better-sqlite3';
+
+import type { LoggerType } from '../../types/Logging';
+
+export default function updateToSchemaVersion70(
+  currentVersion: number,
+  db: Database,
+  logger: LoggerType
+): void {
+  if (currentVersion >= 70) {
+    return;
+  }
+
+  db.transaction(() => {
+    // Used in `getAllStories`.
+    db.exec(
+      `
+      CREATE INDEX messages_by_storyId ON messages (storyId);
+      `
+    );
+
+    db.pragma('user_version = 70');
+  })();
+
+  logger.info('updateToSchemaVersion70: success!');
+}

ts/sql/migrations/index.ts

@@ -45,6 +45,7 @@ import updateToSchemaVersion66 from './66-add-pni-signature-to-sent-protos';
 import updateToSchemaVersion67 from './67-add-story-to-unprocessed';
 import updateToSchemaVersion68 from './68-drop-deprecated-columns';
 import updateToSchemaVersion69 from './69-group-call-ring-cancellations';
+import updateToSchemaVersion70 from './70-story-reply-index';
 
 function updateToSchemaVersion1(
   currentVersion: number,
@@ -1952,6 +1953,7 @@ export const SCHEMA_VERSIONS = [
   updateToSchemaVersion67,
   updateToSchemaVersion68,
   updateToSchemaVersion69,
+  updateToSchemaVersion70,
 ];
 
 export function updateSchema(db: Database, logger: LoggerType): void {