Updated to remove the old index

Reverts to the old index on removal

db/migrate/20200616145031_add_author_id_index_to_audit_events.rb

@@ -7,13 +7,16 @@ class AddAuthorIdIndexToAuditEvents < ActiveRecord::Migration[6.0]
 
   disable_ddl_transaction!
 
-  INDEX_NAME = 'index_on_author_id_and_entity_id_and_entity_type_and_id_desc'.freeze
+  INDEX_NAME = 'index_on_entity_id_and_entity_type_and_id_desc_and_author_id'.freeze
+  OLD_INDEX_NAME = 'index_audit_events_on_entity_id_and_entity_type_and_id_desc'.freeze
 
   def up
-    add_concurrent_index(:audit_events, [:author_id, :entity_id, :entity_type, :id], order: { id: :desc }, name: INDEX_NAME)
+    add_concurrent_index(:audit_events, [:entity_id, :entity_type, :id, :author_id], order: { id: :desc }, name: INDEX_NAME)
+    remove_concurrent_index_by_name(:audit_events, OLD_INDEX_NAME)
   end
 
   def down
+    add_concurrent_index(:audit_events, [:entity_id, :entity_type, :id], order: { id: :desc }, name: OLD_INDEX_NAME)
     remove_concurrent_index_by_name(:audit_events, INDEX_NAME)
   end
 end

db/structure.sql

@@ -9419,8 +9419,6 @@ CREATE INDEX index_approvers_on_target_id_and_target_type ON public.approvers US
 
 CREATE INDEX index_approvers_on_user_id ON public.approvers USING btree (user_id);
 
-CREATE INDEX index_audit_events_on_entity_id_and_entity_type_and_id_desc ON public.audit_events USING btree (entity_id, entity_type, id DESC);
-
 CREATE INDEX index_audit_events_on_ruby_object_in_details ON public.audit_events USING btree (id) WHERE (details ~~ '%ruby/object%'::text);
 
 CREATE INDEX index_award_emoji_on_awardable_type_and_awardable_id ON public.award_emoji USING btree (awardable_type, awardable_id);
@@ -10469,7 +10467,7 @@ CREATE UNIQUE INDEX index_oauth_applications_on_uid ON public.oauth_applications
 
 CREATE INDEX index_oauth_openid_requests_on_access_grant_id ON public.oauth_openid_requests USING btree (access_grant_id);
 
-CREATE INDEX index_on_author_id_and_entity_id_and_entity_type_and_id_desc ON public.audit_events USING btree (author_id, entity_id, entity_type, id DESC);
+CREATE INDEX index_on_author_id_and_entity_id_and_entity_type_and_id_desc ON public.audit_events USING btree (entity_id, entity_type, id DESC, author_id);
 
 CREATE UNIQUE INDEX index_on_deploy_keys_id_and_type_and_public ON public.keys USING btree (id, type) WHERE (public = true);