- extract buildUserDbExportFile() from routes/export.js so the SQLite user-DB
export is testable (route behavior unchanged)
- tests/exportImportRoundTrip.test.js: export user A (bill/payment/override) →
import into fresh user B → assert all money survives exactly in cents. Confirms
the export(fromCents)/import(toCents) conversion is symmetric — no 100x drift —
and guards it from regressing.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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