update patch on tenants

mifosng-db/patches/05a-modify_tenant_timezoneid.sql

@@ -1,2 +1,7 @@
-ALTER TABLE tenants MODIFY timezone_id  VARCHAR(100) not null;  -- timezone are refferd witn names rather than numerics
-UPDATE `tenants` SET `timezone_id`='Asia/Kolkata' WHERE  `id`=1 LIMIT 1; -- setting Indian time zone
+-- modified patch to update column (as nullable first), populate all tenants with indian timezone as default and then set timezone as not null for tenants
+USE `mifosplatform-tenants`;
+-- timezone are refferd with names rather than numerics
+ALTER TABLE `mifosplatform-tenants`.`tenants` CHANGE COLUMN `timezone_id` `timezone_id` VARCHAR(100) NULL DEFAULT NULL;
+-- setting Indian time zone
+UPDATE `tenants` SET `timezone_id`='Asia/Kolkata' WHERE `id`>0;
+ALTER TABLE `mifosplatform-tenants`.`tenants` CHANGE COLUMN `timezone_id` `timezone_id` VARCHAR(100) NOT NULL;