Create v_funnel_collections (#423)

* Add query

* Substitute sub-query with JOIN

* Fix typo in view

* Fix typo in view

* 🎨 Cleanup

* Remove redundant GRANT

* Fix revision for 504

migrations/000.504.sql

@@ -0,0 +1,15 @@
+-- View: public.v_funnel_collections
+
+DROP VIEW public.v_funnel_collections;
+
+CREATE VIEW public.v_funnel_collections
+ AS
+ SELECT c.id AS collection_id,
+        c.name AS collection_name,
+        c.inserted AS date_added,
+        cp.product_id,
+        cp.inserted AS product_date_added
+   FROM collections c
+   JOIN collections_products cp ON c.id = cp.collection_id;
+
+GRANT SELECT ON TABLE public.v_funnel_collections TO funnel;