I'm finding myself in the same situation now. I sent several test gift vouchers to myself and now need to delete them.
I'm looking at the coupons table with phpMyAdmin and I'm wondering if just deleting the records for these vouchers in the coupons table is all I need to do to delete them completely or do I need to delete something else elsewhere and will I mess up anything in doing so?
Also, if I wanted to void a gift voucher, I see there's the column coupon_active, do I just need to change this from 'Y' to 'N' and, again, would I mess up anything by doing so?
Thanks for any input on this.