Add updated columns (#359)

* Add updated columns

* Fix numbering of migration

migrations/000.446.sql

@@ -0,0 +1,17 @@
+ALTER TABLE prices_external_products
+  ADD COLUMN updated TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW();
+
+ALTER TABLE prices_wallpaper_m2
+  ADD COLUMN updated TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW();
+
+CREATE TRIGGER updated_timestamp
+    BEFORE UPDATE
+    ON prices_external_products
+    FOR EACH ROW
+    EXECUTE FUNCTION updated_timestamp();
+
+CREATE TRIGGER updated_timestamp
+    BEFORE UPDATE
+    ON prices_wallpaper_m2
+    FOR EACH ROW
+    EXECUTE FUNCTION updated_timestamp();