Index changeset comments by changeset and date

db/migrate/20201006220807_add_changeset_index_to_changeset_comments.rb

@@ -0,0 +1,8 @@
+class AddChangesetIndexToChangesetComments < ActiveRecord::Migration[6.0]
+  disable_ddl_transaction!
+
+  def change
+    remove_index :changeset_comments, [:author_id, :created_at]
+    add_index :changeset_comments, [:changeset_id, :created_at], :algorithm => :concurrently
+  end
+end