Add database migration for indexes and constraints

db/migrations/23-02-2013-13-04-add-indexes-and-constraints.sql

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+-- create index
+ALTER TABLE `users` ADD INDEX ( `list_id` );
+
+-- add constraint
+ALTER TABLE `users` ADD FOREIGN KEY ( `list_id` ) 
+REFERENCES `lists` ( `id` )
+ON DELETE CASCADE ON UPDATE CASCADE;
+
+-----------------
+
+-- create index
+ALTER TABLE `resources` ADD INDEX ( `newsletter_id` );
+
+-- add constraint
+ALTER TABLE `resources` ADD FOREIGN KEY ( `newsletter_id` ) 
+REFERENCES `newsletters` ( `id` )
+ON DELETE CASCADE ON UPDATE CASCADE;
+
+-----------------
+
+-- create index
+ALTER TABLE `newsletters` ADD INDEX ( `template_id` );
+
+-- template_id can be NULL
+ALTER TABLE `newsletters` CHANGE `template_id` `template_id` INT( 10 ) UNSIGNED NULL DEFAULT NULL; 
+ALTER TABLE `templates` CHANGE `id` `id` INT( 10 ) UNSIGNED NULL AUTO_INCREMENT;
+
+-- add constraint
+ALTER TABLE `newsletters` ADD FOREIGN KEY ( `template_id` )
+REFERENCES `newsletter`.`templates` ( `id` )
+ON DELETE SET NULL ON UPDATE CASCADE;
+
+