added migration file (#386)

* added migration file

* added new constraint

* moved file

migrations/000.471.sql

@@ -0,0 +1,9 @@
+-- Add a new column to the editorial_content table
+ALTER TABLE editorial_content ADD COLUMN editorial_page_type editorial_type NOT NULL DEFAULT 'campaign';
+
+-- Update all editorial_content rows to have the same editorial_page_type as their associated editorial_pages
+UPDATE editorial_content ec SET editorial_page_type = ep.type FROM editorial_pages ep WHERE ec.editorial_page_id = ep.id;
+
+-- We need to update the contraint and add the type to make the id unique since slug can be the same
+ALTER TABLE editorial_content DROP CONSTRAINT editorial_content_unique_key;
+ALTER TABLE editorial_content ADD CONSTRAINT editorial_content_unique_key UNIQUE (slug, market_locale_id, editorial_page_type);