install/update-21.sql

   1 -- episode indices
   2 create index episode_podcast_index on episode (podcast_id);
   3 create index episode_url_index on episode (url);
   4
   5 -- episode_log indices
   6 create index user_id on episode_log(user_id);
   7 create index action on episode_log(action);
   8 create index timestamp on episode_log(timestamp);
   9