attempts to run the test rig with eventloopdelay measure and other feedback

perf-tests/debug_session.ts

@@ -0,0 +1,63 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+import { Storage } from '../packages/core/src/config/storage';
+import { SessionSelector } from '../packages/cli/src/utils/sessionUtils';
+import { join } from 'node:path';
+import { mkdirSync, writeFileSync } from 'node:fs';
+
+async function main() {
+  const testDir = '/private/tmp/perf-scroll-up-true-true';
+  mkdirSync(testDir, { recursive: true });
+
+  const storage = new Storage(testDir);
+  await storage.initialize();
+
+  console.log('Project Temp Dir:', storage.getProjectTempDir());
+
+  const chatsDir = join(storage.getProjectTempDir(), 'chats');
+  mkdirSync(chatsDir, { recursive: true });
+
+  const sessionFile = join(chatsDir, 'session-2026-04-10T00-00-test.jsonl');
+  const metadata = {
+    sessionId: 'test-session-id',
+    projectHash: 'test-project-hash',
+    startTime: new Date().toISOString(),
+    lastUpdated: new Date().toISOString(),
+    kind: 'main',
+    hasUserOrAssistantMessage: true,
+    messageCount: 1,
+    summary: 'Test Session',
+  };
+
+  const msg = {
+    id: 'msg-0',
+    timestamp: new Date().toISOString(),
+    type: 'user',
+    content: 'Message content 0',
+  };
+
+  writeFileSync(
+    sessionFile,
+    JSON.stringify(metadata) + '\n' + JSON.stringify(msg) + '\n',
+  );
+  console.log('Created file:', sessionFile);
+
+  const selector = new SessionSelector(storage);
+  const sessions = await selector.listSessions();
+  console.log(
+    'Sessions found:',
+    sessions.map((s) => s.id),
+  );
+
+  try {
+    const resolved = await selector.resolveSession('test-session-id');
+    console.log('Resolved session:', resolved.sessionData.sessionId);
+  } catch (e) {
+    console.error('Failed to resolve:', e);
+  }
+}
+
+main();