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Oliver Kieselbach
a7a1cc43c1
First production auto-approve (mueller-steinag.ch) activated 64s after signup, 5s before the user saved their notification address on the activation page - the approval path found no address and silently skipped the welcome mail. Both racing paths now write-then-read: the notification-email save path checks approval fresh (bypassing the 30s negative cache) and triggers the send when activation already happened. A conditional-insert welcome-email-sent marker in PreviewWhitelist makes the send once-only across both paths; it is consumed strictly after the address check so it can never be burned without an address. Revoke clears the marker, the GA resend endpoint sends unconditionally and consumes it best-effort. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>