add index for sorting by published_at

packages/db/migrations/0155.do.library_item_user_id_published_at_idx.sql

@@ -0,0 +1,6 @@
+-- Type: DO
+-- Name: library_item_user_id_published_at_idx
+-- Description: Add library_item_user_id_published_at_idx index on library_item table for user_id and published_at
+
+-- create index for sorting concurrently to avoid locking
+CREATE INDEX CONCURRENTLY IF NOT EXISTS library_item_user_id_updated_at_idx ON omnivore.library_item (user_id, updated_at DESC NULLS LAST);

packages/db/migrations/0155.undo.library_item_user_id_published_at_idx.sql

@@ -0,0 +1,9 @@
+-- Type: UNDO
+-- Name: library_item_user_id_published_at_idx
+-- Description: Add library_item_user_id_published_at_idx index on library_item table for user_id and published_at
+
+BEGIN;
+
+DROP INDEX IF EXISTS library_item_user_id_published_at_idx;
+
+COMMIT;