-id BIGINT(20) NOT NULL AUTO_INCREMENT,
-userid BIGINT(20) NOT NULL DEFAULT '0',
-refid BIGINT(20) NOT NULL DEFAULT '0',
-points DOUBLE(20,5) NOT NULL DEFAULT '0.00000',
+id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
+userid BIGINT(20) UNSIGNED NOT NULL DEFAULT '0',
+refid BIGINT(20) UNSIGNED NOT NULL DEFAULT '0',
+points DOUBLE(20,5) UNSIGNED NOT NULL DEFAULT '0.00000',