Best way to remove GV Queue data is to do so via phpMyAdmin, where in TABLE = coupon_gv_queue, you select any/all records that you want to delete. Your table may have a PREFIX... eg: zen_coupon_gv_queue
If it is still a TEST shop, and the only data in that table is stuff you've put there for testing, then run the following via your webshop admin panel "Install SQL Ptches" (under TOOLS).
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BACKUP database before running SQL commands.
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Run this to EMPTY the whole table:
TRUNCATE TABLE `coupon_gv_queue`;
(No need to use prefixes here as your zc shop will know if it needs to put in a prefix or not.)
Gift Certificates are not so much "products" as they are a PAYMENT METHOD. This is also true in a physical shop too. If I buy a GC over the counter of my local bookshop, they don't care a hoot what I do with it after I take possession of it. I can give it to anyone, who then uses it as if it were cash, in the shop.
Gift Certificates are a way of issuing CREDIT, and, just as they are in physical shops, the value is NEGOTIABLE and TRANSFERABLE - just like real money.
If you want to offer a single customer a voucher that can only be used by them, then set up a COUPON that can only be redeemed by one person once only. E-mail the coupon code to that person and remind them that should they let others see the code, it can be used by a third party.