Complete context package for when we're ready to implement:
- Current webhook handler code (checkout.session.completed only)
- Database schema (what exists vs what's needed)
- Missing handlers list (payment_failed, cancelled, chargeback)
- Grace period sweeper requirements
- Reference to March 30 code blocks
This is prep for future session, not immediate work.
Signed-off-by: claude@firefrostgaming.com
