TT#32910 TT#33037 initial cash_balance, free_time_balance

lt 3secs for 100k contract_balances records

Change-Id: I17f3273d30aba39c67b767874ce39cd58545fc29
(cherry picked from commit 6629703415)

db_scripts/diff/15385.down

@@ -0,0 +1,7 @@
+use billing;
+
+ALTER TABLE `contract_balances`
+  DROP COLUMN `initial_cash_balance`,
+  DROP COLUMN `initial_free_time_balance`;
+
+ALTER TABLE topup_log CHANGE COLUMN `type` `type` ENUM('cash','voucher') NOT NULL;

db_scripts/diff/15385.up

@@ -0,0 +1,8 @@
+use billing;
+
+ALTER TABLE `contract_balances`
+  ADD COLUMN `initial_cash_balance` double DEFAULT NULL,
+  ADD COLUMN `initial_free_time_balance` int(11) DEFAULT NULL;
+
+ALTER TABLE topup_log CHANGE COLUMN `type` `type` ENUM('cash','voucher','set_balance') NOT NULL;
+