How to prevent Foreign Key crashes with Stripe Webhooks in .NET 10.

When integrating Stripe Subscriptions in a .NET application, developers often face issues with the checkout.session.completed webhook due to unmapped Stripe Price IDs. This can lead to Foreign Key constraint violations. To prevent this, map the Stripe Price ID to the internal Database Plan ID in the webhook handler. This involves extracting the Stripe Price ID, looking up the internal Plan ID, and falling back to a default plan if the sync is missing. This approach ensures a safe and reliable insertion or update of user subscriptions.