Stripe Discount warehouse sync fails with KeyError: 'created'

Bug

Stripe Discount schema sync fails with:

KeyError: 'created'

Why

Stripe Discount objects expose start / end, not created (Discount object).

Empty Discount syncs succeed (0 rows, webhook-only short-circuit). Once real customer.discount.* events arrive (e.g. coupon applied to a subscription), the webhook→warehouse path crashes looking up created.

Repro

1. Connect Stripe with Discount schema enabled (sync_type: webhook)
2. Apply a coupon to a customer/subscription so customer.discount.created fires
3. Observe Discount sync fail with KeyError: 'created'

Expected

Discount rows land in stripe_discount using start (or coalesce created/start) as the timestamp field.

Impact

• Source shows Failed; Discount table never created
• Under webhook mode, stripe_subscription.discounts is only ["di_…"] IDs with no join target
• Other Stripe schemas continue syncing normally

Suggested fix

In the Stripe Discount webhook ingest path, do not assume obj['created'] — use start for Discount objects.

Context

• Cloud project, Stripe API version pinned to 2024-09-30.acacia
• Also reported via PostHog agent-feedback channel

Start in the Stripe Discount webhook ingest path and search for the lookup of obj['created']; inspect how customer.discount.* events are transformed for warehouse sync. Reproduce with a real Discount event, then verify that a stripe_discount row is created using the Discount timestamp and that other Stripe schemas continue syncing.