Kydoimosandanthropic/claude-opus-4-8
acda3cda0f
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A student who enrols while a group class is pay-now is charged once at enrolment, and that charge carries no period_key. When the class is later switched to monthly, the daily scan — which dedups scheduled charges by period_key — does not see the up-front charge and bills the enrolment again for the current month, double-charging students who had already paid. The differing payer between the two rows (student vs guardian) was a side effect of guardian links created between the two charge dates, not the cause. Switching a group class into monthly now adopts each active enrolment's up-front charge into the current month (stamping period_key and due_date) so the scan treats that month as billed and charges from the next month on. Enrolments with no up-front charge, or already billed for the month, are left alone; weekly and non-group offerings are not touched. Wired into both offering-update paths (admin form and REST). Co-authored-by: anthropic/claude-opus-4-8