⚡ Bolt: Offload blocking file I/O to threadpool in field officer uploads

[RohanExploit]

💡 What: Wrapped the synchronous f.write(content) file saving logic in the upload_visit_images endpoint (backend/routers/field_officer.py) inside run_in_threadpool.

🎯 Why: The upload_visit_images endpoint is an async def function. Performing blocking synchronous I/O directly within it blocks the FastAPI/Starlette asyncio main event loop. This significantly degrades throughput and increases tail latency for all concurrent users while the file is being written to disk.

📊 Impact: Reduces event loop blocking during field officer image uploads, allowing the server to handle more concurrent requests and improving overall responsiveness, especially under high load scenarios.

🔬 Measurement: Verify by running load tests against the /api/field_officer/visit/{visit_id}/images endpoint with concurrent requests. The 95th percentile latency of other concurrent non-blocking endpoints should decrease significantly compared to before the optimization.

---

PR created automatically by Jules for task 11282042600359396073 started by @RohanExploit

---

Summary by cubic

Offloaded blocking file writes in the field officer image upload endpoint by wrapping f.write(...) in run_in_threadpool. This prevents blocking the async event loop, improving responsiveness and throughput during concurrent uploads.

^{Written for commit 300e831. Summary will update on new commits. Review in cubic}

[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.

[netlify]

✅ Deploy Preview for fixmybharat canceled.

Name	Link
🔨 Latest commit	300e831
🔍 Latest deploy log	https://app.netlify.com/projects/fixmybharat/deploys/6a15ae18da38090008fba283

[coderabbitai]

Warning

Review limit reached

@RohanExploit, we couldn't start this review because you've reached your PR review rate limit.

More reviews will be available in 51 minutes and 55 seconds. Learn how PR review limits work.

Your organization has run out of usage credits. Purchase more in the billing tab.

⌛ How to resolve this issue?

After more reviews become available, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans include higher PR review limits than trial, open-source, and free plans. In all cases, reviews become available again over time. During sustained high-volume PR review activity, CodeRabbit may temporarily slow when the next review becomes available.

Please see our Fair Usage Limits Policy for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b562b3c6-e82c-42c0-b413-d2e1a6ec050d

📥 Commits

Reviewing files that changed from the base of the PR and between ebecc88 and 300e831.

📒 Files selected for processing (2)

• .jules/bolt.md
• backend/routers/field_officer.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bolt-async-io-field-officer-11282042600359396073

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[github-actions]

🙏 Thank you for your contribution, @RohanExploit!

PR Details:

• Title: ⚡ Bolt: Offload blocking file I/O to threadpool in field officer uploads
• Number: ⚡ Bolt: Offload blocking file I/O to threadpool in field officer uploads #807

Quality Checklist:
Please ensure your PR meets the following criteria:

• Code follows the project's style guidelines
• Self-review of code completed
• Code is commented where necessary
• Documentation updated (if applicable)
• No new warnings generated
• Tests added/updated (if applicable)
• All tests passing locally
• No breaking changes to existing functionality

Review Process:

1. Automated checks will run on your code
2. A maintainer will review your changes
3. Address any requested changes promptly
4. Once approved, your PR will be merged! 🎉

Note: The maintainers will monitor code quality and ensure the overall project flow isn't broken.

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}

[Copilot]

Pull request overview

This PR improves FastAPI async endpoint responsiveness by offloading blocking disk writes during field officer visit image uploads to a threadpool, preventing event-loop blocking under concurrent load.

Changes:

• Imported run_in_threadpool and used it in upload_visit_images to write image bytes on a worker thread.
• Added a Bolt learning note documenting the rationale and recommended pattern for async endpoints doing file I/O.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
backend/routers/field_officer.py	Wraps synchronous open(...).write(...) in run_in_threadpool inside the async upload endpoint to avoid blocking the event loop.
.jules/bolt.md	Documents the learning/action item for offloading blocking file I/O in async FastAPI endpoints.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.