ulc_code_ in user metadata

Hi Uncanny Owl team,

We use Uncanny Redemption Codes 5.0 with Gravity Forms. Our custom flow processes anonymous redemptions through one shared WordPress user, which now has approximately 183,000 ulc_code_<coupon_id> rows in wp_usermeta. This causes WordPress metadata-cache queries to load all those rows and significantly affects performance.

We noticed that the plugin also records redemptions in wp_uncanny_codes_usage, while the source describes ulc_code_* metadata as “just for backup.”

Could you please confirm:
1. Is ulc_code_* used by any current functionality or recovery process?
2. Can we safely delete these rows after verifying corresponding wp_uncanny_codes_usage records?
3. Is there a supported way to disable the backup metadata write?
4. Is using one shared WordPress user for anonymous redemptions supported?

Thanks.