Added entity scene count function.

migrations/20220126132955_scene_counts.js

@@ -0,0 +1,11 @@
+exports.up = async (knex) => knex.raw(`
+	CREATE OR REPLACE FUNCTION entities_scene_total(entity entities) RETURNS integer AS $$
+		SELECT COUNT(id)
+		FROM releases
+		WHERE releases.entity_id = entity.id;
+	$$ LANGUAGE SQL STABLE;
+`);
+
+exports.down = async (knex) => knex.raw(`
+	DROP FUNCTION IF EXISTS entities_scene_total;
+`);