perf(worker): Batch fetch testruns for flake processing

[sentry]

Fixes WORKER-Y7N. The issue was that: Testruns are fetched individually for each upload within a loop, causing an N+1 query pattern.

• Refactored get_testruns into get_testruns_for_uploads to accept multiple upload IDs and return a dictionary of testruns grouped by upload ID.
• Modified process_single_upload to directly accept a list of testruns, removing its internal fetching logic.
• Updated process_flakes_for_commit to fetch all relevant testruns for all uploads in a single batched query.
• Significantly reduced database queries from N+1 to 2 when processing flakes for multiple uploads, improving performance.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13332217

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Note

Low Risk
Low risk performance refactor that reduces DB queries by batching Testrun fetches; main risk is subtle behavior differences in how testruns are grouped per upload and bulk-updated.

Overview
Reduces an N+1 query pattern in flake processing by fetching all recent Testruns for a commit’s uploads in a single query and grouping them by upload_id.

process_single_upload is refactored to accept a pre-fetched list of testruns (instead of querying per upload), and process_flakes_for_commit now batches upload retrieval and passes the grouped testruns through before bulk-updating outcomes.

^{Reviewed by Cursor Bugbot for commit 27cf839. 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 (8c332b1) to head (27cf839).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #817   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files        1306     1306           
  Lines       48004    48010    +6     
  Branches     1636     1636           
=======================================
+ Hits        44286    44292    +6     
  Misses       3407     3407           
  Partials      311      311           

Flag	Coverage Δ
workerintegration	58.56% <16.66%> (-0.02%)	⬇️
workerunit	90.39% <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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