Audit item #9. pollPrices() and refreshStations() shared the same
do/while batch loop with token + try/catch + Log::error + clean-exit
detection but different bodies. Extracted to a private iterateBatches()
that takes the endpoint, optional since timestamp, and a process
callable. Returns [total_processed, completedCleanly] so pollPrices
can still gate its incremental-poll cache update on a clean exhaustion.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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