Kydoimosandanthropic/claude-opus-4-8
e389e40843
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The daily billing scan runs on request via WP-Cron and can overlap itself under concurrent traffic. Each run emailed the payments it created with no record that a notice had gone out, so two overlapping runs could send a payer two identical "Payment due" emails for one charge — read by families as being billed twice, though only one row exists. Stamp us_payments.notice_sent_at atomically before emailing: the scan now claims each payment with a conditional UPDATE ... WHERE notice_sent_at IS NULL and only notices, credits and batches the rows it won. A competing run finds them claimed and stays quiet, so exactly one notice is sent regardless of how the scan is triggered. A one-time backfill stamps existing scheduled rows on upgrade so already-noticed charges are not re-emailed. Co-authored-by: anthropic/claude-opus-4-8