perf(worker): Optimize flake processing by batching testruns

[sentry]

Fixes WORKER-Y8X. The issue was that: process_single_upload queries Testrun table for each ReportSession in a loop, causing N+1 queries.

• Modified get_testruns to accept a list of ReportSession objects, enabling it to fetch testruns for multiple uploads simultaneously.
• Removed the process_single_upload function, consolidating its logic.
• Refactored process_flakes_for_commit to fetch all relevant testruns for a commit's uploads in a single query.
• Streamlined flake detection logic to iterate over all fetched testruns and perform a single bulk_update at the end.
• Improved performance by reducing database interactions and batching operations.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13544443

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Note

Medium Risk
Moderate risk because it refactors flake detection to process all uploads’ Testruns in one batch, which could subtly change ordering/side effects (e.g., when outcomes are updated) and impacts DB write patterns.

Overview
Optimizes flake processing by removing per-upload Testrun queries. get_testruns now accepts multiple ReportSessions and fetches all recent testruns via upload_id__in, eliminating the N+1 loop.

process_flakes_for_commit is refactored to load all relevant uploads and testruns up front, apply the existing pass/fail flake logic across the combined stream, and perform a single bulk_update of updated testrun outcomes at the end; the process_single_upload helper is removed.

^{Reviewed by Cursor Bugbot for commit 87b9bc5. Bugbot is set up for automated code reviews on this repo. Configure here.}

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.25%. Comparing base (0ad8a0c) to head (87b9bc5).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #863      +/-   ##
==========================================
- Coverage   92.25%   92.25%   -0.01%     
==========================================
  Files        1307     1307              
  Lines       48017    48012       -5     
  Branches     1636     1636              
==========================================
- Hits        44299    44294       -5     
  Misses       3407     3407              
  Partials      311      311              

Flag	Coverage Δ
workerintegration	58.55% <6.25%> (+<0.01%)	⬆️
workerunit	90.38% <100.00%> (-0.01%)	⬇️

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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