Optimize some indices and queries

ts/sql/migrations/74-optimize-convo-open.ts

@@ -0,0 +1,39 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { Database } from '@signalapp/better-sqlite3';
+
+import type { LoggerType } from '../../types/Logging';
+
+export default function updateToSchemaVersion74(
+  currentVersion: number,
+  db: Database,
+  logger: LoggerType
+): void {
+  if (currentVersion >= 74) {
+    return;
+  }
+
+  db.transaction(() => {
+    db.exec(
+      `
+      -- Previously: (isUserInitiatedMessage)
+      DROP INDEX message_user_initiated;
+
+      CREATE INDEX message_user_initiated ON messages (conversationId, isUserInitiatedMessage);
+
+      -- Previously: (unread, conversationId)
+      DROP INDEX reactions_unread;
+
+      CREATE INDEX reactions_unread ON reactions (
+        conversationId,
+        unread
+      );
+      `
+    );
+
+    db.pragma('user_version = 74');
+  })();
+
+  logger.info('updateToSchemaVersion74: success!');
+}