perf(worker): Batch testrun updates in flake processing

[sentry]

Fixes WORKER-Y7G. The issue was that: Missing eager loading of Testrun objects for ReportSessions causes N+1 queries within process_flakes_for_commit loop.

• Refactored get_testruns into get_testruns_for_uploads to fetch testruns for multiple uploads simultaneously.
• Modified process_single_upload to accept pre-fetched testruns, eliminating individual database queries within the loop.
• Consolidated Testrun outcome bulk updates into a single operation within process_flakes_for_commit after all uploads have been processed.
• Improved database efficiency by reducing the number of queries for testruns and bulk update operations during flake processing.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13305954

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Note

Medium Risk
Changes the query/update strategy for Testrun rows during flake processing (batch fetch + deferred bulk update), which could impact correctness if upload scoping or update ordering assumptions were relied on, though overall logic is unchanged.

Overview
Reduces N+1 queries in flake processing by fetching all recent Testrun rows for a commit’s uploads in a single query (get_testruns_for_uploads) and grouping them by upload_id.

Refactors process_single_upload to operate on pre-fetched testruns and defers all Testrun.outcome writes into one bulk_update after processing all uploads, instead of updating per upload.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Unused upload_id parameter in process_single_upload

Low Severity

The upload_id parameter was added to process_single_upload but is never referenced in the function body. The function only iterates over the testruns list and uses curr_flakes and repo_id. This dead parameter adds confusion about the function's contract and could mislead future developers into thinking it's used internally.

 

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[codecov-notifications]

Codecov Report

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

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[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.25%. Comparing base (8c332b1) to head (6fdc95b).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #811   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files        1306     1306           
  Lines       48004    48012    +8     
  Branches     1636     1636           
=======================================
+ Hits        44286    44294    +8     
  Misses       3407     3407           
  Partials      311      311           

Flag	Coverage Δ
workerintegration	58.56% <13.33%> (-0.03%)	⬇️
workerunit	90.39% <100.00%> (+<0.01%)	⬆️

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