feat(database): update user table to add referral percentage and only first purchase fields

initialize/migrate/database/02108_user_referral.down.sql

@@ -1,3 +1,3 @@
-ALTER TABLE `u`
+ALTER TABLE `user`
 DROP COLUMN `referral_percentage`,
 DROP COLUMN `only_first_purchase`;

initialize/migrate/database/02108_user_referral.up.sql

@@ -1,4 +1,4 @@
-ALTER TABLE `u`
+ALTER TABLE `user`
     ADD COLUMN `referral_percentage` TINYINT UNSIGNED NOT NULL DEFAULT 0
       COMMENT 'Referral Percentage'
       AFTER `commission`,