A narrow Clerk webhook failure: replayed user.created events can duplicate local user rows unless your handler reconciles by provider ID.
The login worked. The webhook worked. Then the same event arrived again.
Clerk webhooks are easy to treat like a notification:
user.created arrived
create a local user
done
The Silent Killer: Why Webhook Idempotency Matters You deploy a webhook handler that...
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Stripe webhook delivery is at-least-once, not exactly-once. Here is the atomic dedupe pattern our SaaS kit ships with by default.
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