feat: complete assessment tasks

db.sql

@@ -1347,7 +1347,7 @@ CREATE TABLE `wp_wc_download_log` (
 	`permission_id` bigint(20) unsigned NOT NULL DEFAULT 0,
 	`user_id` bigint(20) unsigned,
 	`user_ip_address` varchar(100) DEFAULT '',
-	`KEY` timestamp(timestamp),
+	KEY `idx_timestamp` (`timestamp`),
 	PRIMARY KEY (`download_log_id`),
 	KEY `permission_id` (`permission_id`)
 );