add an index for api key

packages/db/migrations/0162.do.create_more_index_on_library_item.sql

@@ -4,3 +4,4 @@
 
 CREATE INDEX CONCURRENTLY IF NOT EXISTS library_item_user_id_state_idx ON omnivore.library_item (user_id, state);
 
+CREATE INDEX CONCURRENTLY IF NOT EXISTS api_key_key_idx ON omnivore.api_key (key);

packages/db/migrations/0162.undo.create_more_index_on_library_item.sql

@@ -4,6 +4,7 @@
 
 BEGIN;
 
+DROP INDEX IF EXISTS api_key_key_idx;
 DROP INDEX IF EXISTS library_item_user_id_state_idx;
 
 COMMIT;