Adjusting indexes to make favorites query more efficient, based on feedback from ops.

fave_user_id_idx index changed from (user_id) to (user_id,modified), so the timestamp ordering can be done straight from the index while we're looking up the user's notices.
Added to 08to09.sql and 08to09_pg.sql; may need to be run manually by folks doing development.
(No harm if you don't update it, the favorites tab/rss feed will just stay inefficent.)

1 files changed, 3 insertions, 0 deletions

diff --git a/db/08to09_pg.sql b/db/08to09_pg.sql
index 197fcabfd..956c4dee5 100644
--- a/db/08to09_pg.sql
+++ b/db/08to09_pg.sql
@@ -48,3 +48,6 @@ create table login_token (
     constraint primary key (user_id)
 );
 
+alter table fave
+    drop index fave_user_id_idx,
+    add index fave_user_id_idx using btree(user_id,modified);