* Add (failing) test for deleted coupon amounts in reporting.
* Always sync an ID into the order-coupon lookup table.
* Don't remove coupon data from order analytics when the coupon is deleted.
* Fix coupon ID lookup from order item metadata.
* Allow negative coupon_id in the lookup table.
Representing deleted coupons.
* Handle deleted coupons when gathering extended info.
* Add more tests for deleted coupon handling.
* Handle deleted coupons in coupons report table.
* Fix lint errors.
Jeff Stieler
Peter Fabian