Add additional index for reverse sorting order

db/migrate/20210601125410_add_runners_created_at_index.rb

@@ -8,13 +8,13 @@ class AddRunnersCreatedAtIndex < ActiveRecord::Migration[6.0]
 
   disable_ddl_transaction!
 
-  INDEX_NAME = 'index_ci_runners_on_created_at_and_id'
-
   def up
-    add_concurrent_index :ci_runners, [:created_at, :id], name: INDEX_NAME
+    add_concurrent_index :ci_runners, [:created_at, :id], order: { id: :desc }, name: 'index_ci_runners_on_created_at_and_id_desc'
+    add_concurrent_index :ci_runners, [:created_at, :id], order: { created_at: :desc, id: :desc }, name: 'index_ci_runners_on_created_at_desc_and_id_desc'
   end
 
   def down
-    remove_concurrent_index :ci_runners, [:created_at, :id], name: INDEX_NAME
+    remove_concurrent_index :ci_runners, [:created_at, :id], order: { id: :desc }, name: 'index_ci_runners_on_created_at_and_id_desc'
+    remove_concurrent_index :ci_runners, [:created_at, :id], order: { created_at: :desc, id: :desc }, name: 'index_ci_runners_on_created_at_desc_and_id_desc'
   end
 end

db/migrate/20210601133459_replace_runners_contacted_at_index.rb

@@ -9,16 +9,17 @@ class ReplaceRunnersContactedAtIndex < ActiveRecord::Migration[6.0]
   disable_ddl_transaction!
 
   OLD_INDEX_NAME = 'index_ci_runners_on_contacted_at'
-  NEW_INDEX_NAME = 'index_ci_runners_on_contacted_at_and_id'
 
   def up
-    add_concurrent_index :ci_runners, [:contacted_at, :id], name: NEW_INDEX_NAME, using: 'btree'
+    add_concurrent_index :ci_runners, [:contacted_at, :id], order: { id: :desc }, name: 'index_ci_runners_on_contacted_at_and_id_desc', using: 'btree'
+    add_concurrent_index :ci_runners, [:contacted_at, :id], order: { contacted_at: :desc, id: :desc }, name: 'index_ci_runners_on_contacted_at_desc_and_id_desc', using: 'btree'
 
     remove_concurrent_index_by_name :ci_runners, OLD_INDEX_NAME
   end
 
   def down
-    remove_concurrent_index_by_name :ci_runners, NEW_INDEX_NAME
+    remove_concurrent_index_by_name :ci_runners, 'index_ci_runners_on_contacted_at_and_id_desc'
+    remove_concurrent_index_by_name :ci_runners, 'index_ci_runners_on_contacted_at_desc_and_id_desc'
 
     add_concurrent_index :ci_runners, :contacted_at, name: OLD_INDEX_NAME, using: 'btree'
   end

db/structure.sql

@@ -22904,9 +22904,13 @@ CREATE INDEX index_ci_runner_projects_on_project_id ON ci_runner_projects USING
 
 CREATE INDEX index_ci_runner_projects_on_runner_id ON ci_runner_projects USING btree (runner_id);
 
-CREATE INDEX index_ci_runners_on_contacted_at_and_id ON ci_runners USING btree (contacted_at, id);
+CREATE INDEX index_ci_runners_on_contacted_at_and_id_desc ON ci_runners USING btree (contacted_at, id DESC);
 
-CREATE INDEX index_ci_runners_on_created_at_and_id ON ci_runners USING btree (created_at, id);
+CREATE INDEX index_ci_runners_on_contacted_at_desc_and_id_desc ON ci_runners USING btree (contacted_at DESC, id DESC);
+
+CREATE INDEX index_ci_runners_on_created_at_and_id_desc ON ci_runners USING btree (created_at, id DESC);
+
+CREATE INDEX index_ci_runners_on_created_at_desc_and_id_desc ON ci_runners USING btree (created_at DESC, id DESC);
 
 CREATE INDEX index_ci_runners_on_description_trigram ON ci_runners USING gin (description gin_trgm_ops);