getTracker ran a payments query per bill plus computeAmountSuggestion per bill
(up to 12 queries each: 6 months x 2) inside bills.map — ~70-450 queries for a
35-bill account per load. Now one query fetches all cycle payments (grouped in
JS per bill range) and two compute all amount suggestions
(computeAmountSuggestionsBatch). Behavior-preserving.
Test: tests/amountSuggestionService.test.js pins batch == per-bill output.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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