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fix(stats): retry transient query failures - #50205
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Issue for this PR
The full production backfill encountered an R2 SQL
40005query timeout after pagination was deployed. One transient failure discarded all completed queries in the pass.Type of change
What does this PR do?
Retry the failing page up to twice, with exponential backoff, for R2 query timeouts, HTTP 429, and HTTP 5xx responses. Preserve already-read pages. Syntax, authorization, and unpaginated row-limit errors still fail immediately.
How did you verify your code works?
All 29 stats-core tests pass, including a second-page timeout that recovers without duplicating earlier rows, bounded retry exhaustion, and immediate failure for permanent errors. Stats core/server and repository-wide typechecks plus
git diff --checkpass. A fresh production replay of the historical query succeeded with 6,736 unique rows after the earlier timeout and HTTP 500 failures.Checklist