billing_period stores the first day of the calendar month (e.g. 2026-03-01). Added in migration 035. Pre-035 entries have NULL and are handled with a fallback in invoice generation:
Fee Ledger — Core Financial Record
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billing_period stores the first day of the calendar month (e.g. 2026-03-01). Added in migration 035. Pre-035 entries have NULL and are handled with a fallback in invoice generation:
WHERE (billing_period = $periodDate
OR (billing_period IS NULL AND DATE_TRUNC('month', created_at) = $periodDate))