chore(*.psql/*.sql): update all *.psql to *.sql files

queries/functions/update_scheduled_episode_status.sql

@@ -0,0 +1,10 @@
+CREATE OR REPLACE FUNCTION update_scheduled_episode_status()
+RETURNS TRIGGER AS $$
+BEGIN
+  UPDATE scheduled_episodes
+  SET status = 'aired'
+  WHERE air_date < CURRENT_DATE
+    AND status = 'upcoming';
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;