WC Coupon Lookup Fix
Removes redundant LOWER() from WooCommerce coupon lookup query, enabling index usage on wp_posts.post_title. Safe on all WordPress installations because WordPress guarantees case-insensitive collation (utf8mb4_unicode_ci) since WP 4.2.
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Install
No release zip yet. The repository archive installs, but the folder name will carry the branch suffix and updates will not flow:
wp plugin install https://github.com/kissplugins/woo-coupon-fix/archive/refs/heads/main.zip