MT#5879 Change is_active field to boolean and add unique index to (reseller_id,is_active) so maintain only one active template per reseller.

db_scripts/diff/15042.down

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+USE billing;
+
+ALTER TABLE invoice_template MODIFY is_active  int(1) unsigned NOT NULL DEFAULT '1';
+ALTER TABLE `invoice_template` DROP INDEX `invoice_template_reseller_active_UNIQUE`;

db_scripts/diff/15042.up

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+USE billing;
+
+ALTER TABLE invoice_template MODIFY is_active boolean not null default 0;
+
+ALTER TABLE `invoice_template`
+  ADD UNIQUE INDEX `invoice_template_reseller_active_UNIQUE` (`reseller_id`,`is_active`);