perf: optimize leaderboard serialization bypassing pydantic

[RohanExploit]

Optimized leaderboard performance by bypassing Pydantic serialization. Constructs native Python dictionaries directly before JSON serialization, reducing overhead without breaking application flow. Tests have been executed and passed.

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PR created automatically by Jules for task 16737325514022446465 started by @RohanExploit

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Summary by cubic

Speed up the leaderboard endpoint by bypassing pydantic during serialization. Build plain dicts in get_leaderboard, reducing per-item overhead without changing the JSON response.

• Refactors
  • Replace LeaderboardEntry model creation with direct dict construction; remove .model_dump(mode="json").
  • Keep response shape the same ({"leaderboard": [...]}) and continue using json.dumps.

^{Written for commit f91a57f. Summary will update on new commits.}

Summary by CodeRabbit

• Refactor
  • Optimized internal data handling in leaderboard retrieval. No user-visible changes to functionality or behavior.

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[github-actions]

🙏 Thank you for your contribution, @RohanExploit!

PR Details:

• Title: perf: optimize leaderboard serialization bypassing pydantic
• Number: perf: optimize leaderboard serialization bypassing pydantic #636

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

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 01a7572a-4226-404e-bc5a-8c22e7cbe2c9

📥 Commits

Reviewing files that changed from the base of the PR and between da76aa4 and f91a57f.

📒 Files selected for processing (1)

• backend/routers/utility.py

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📝 Walkthrough

Walkthrough

The get_leaderboard function in backend/routers/utility.py is refactored to construct leaderboard entries as plain dictionaries with user_email, reports_count, total_upvotes, and rank fields instead of instantiating LeaderboardEntry schema objects and calling model_dump(mode='json'). All upstream and downstream logic remains unchanged.

Changes

Cohort / File(s)	Summary
Leaderboard Data Construction backend/routers/utility.py	Replaced Pydantic LeaderboardEntry model instantiation with plain dictionary construction in get_leaderboard function—same fields and output, simplified data assembly.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• ⚡ Bolt: [performance improvement] Pre-serialized JSON caching for utility endpoints #616: Also modifies backend/routers/utility.py and changes leaderboard response construction methodology, potentially affecting how the endpoint serializes and returns data.

Suggested labels

size/s

Poem

🐰 Dicts now bloom where schemas once stood,
Plain keys and values, just as they should.
No Pydantic dance, just data so clean,
The leaderboard flows like it's never been seen! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'perf: optimize leaderboard serialization bypassing pydantic' directly and clearly describes the main change—a performance optimization that bypasses Pydantic serialization in the leaderboard endpoint.
Description check	✅ Passed	The pull request description covers the main change, references testing, and aligns with the template structure, though some optional template fields are not explicitly addressed.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch perf/optimize-leaderboard-serialization-16737325514022446465

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[Copilot]

Pull request overview

This PR improves the /leaderboard endpoint performance in the FastAPI backend by avoiding per-entry Pydantic model construction/serialization and instead building plain Python dictionaries prior to JSON encoding and caching.

Changes:

• Replace LeaderboardEntry(...).model_dump(mode="json") with direct dict construction for each leaderboard row.
• Keep response JSON caching behavior unchanged while reducing serialization overhead in the hot loop.

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[cubic-dev-ai]

No issues found across 1 file