⚡ Bolt: Optimize session filtering in useSessionList

[TheRealAshik]

💡 What: Lifted new Date() allocation out of the .filter() loop by pre-calculating the 24-hours-ago cutoff as an ISO 8601 string, allowing for O(1) direct string comparison.

🎯 Why: Calling new Date() for every session inside an array iteration is O(N) overhead in CPU and memory and is not necessary when working with zero-padded, chronological ISO 8601 strings.

📊 Impact: Reduces memory allocation and CPU cycles linearly based on the number of cached sessions.

🔬 Measurement: Local tests (pnpm test) continue to pass. Verified via code inspection that timestamps correctly compare against a static ISO string boundary.

---

PR created automatically by Jules for task 7741048195780931115 started by @TheRealAshik

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
julesagent	Ready	Preview, Comment	Mar 25, 2026 4:06pm

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on a performance enhancement within the useSessionList hook, optimizing how sessions are filtered based on their creation time. By pre-calculating a 24-hour cutoff as an ISO 8601 string and performing direct string comparisons, the change avoids repeated Date object allocations, leading to improved efficiency. Additionally, it includes a resolution for merge conflicts in the ChatHistory component.

Highlights

• Performance Optimization: Eliminated new Date() allocations within the session filtering loop in useSessionList, significantly reducing CPU and memory overhead by pre-calculating the 24-hour cutoff.
• Efficient Date Comparison: Implemented direct lexical comparison of ISO 8601 strings for date filtering, leveraging their chronological nature for O(1) comparison, which is much faster than creating Date objects repeatedly.
• Merge Conflict Resolution: Resolved merge conflicts in ChatHistory.tsx related to aria-label attributes for artifact download and open actions, standardizing the labels.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for GitHub and other Google products, sign up here.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request introduces a good performance optimization in useSessionList by avoiding Date object creation inside a loop, which is a great improvement. My review includes a couple of comments regarding unrelated changes in ChatHistory.tsx that seem to be remnants of a merge conflict resolution. To maintain a clean and focused commit history, it would be best to remove these from this PR.

[gemini-code-assist]

These lines appear to be merge conflict markers. While the resolution is correct, including merge conflict resolutions in a feature or optimization PR makes the history harder to follow. It's a best practice to keep pull requests focused on a single logical change. Please consider rebasing your branch to remove these unrelated changes from this PR.

[gemini-code-assist]

Similar to the comment above, these lines are merge conflict markers. To keep the PR focused on the useSessionList optimization, it would be ideal to remove these unrelated changes.