1 files changed, 32 insertions, 0 deletions
diff --git a/db/post_migrate/20211202145237_add_todos_project_and_id_index.rb b/db/post_migrate/20211202145237_add_todos_project_and_id_index.rb
new file mode 100644
index 00000000000..69f7822c057
--- /dev/null
+++ b/db/post_migrate/20211202145237_add_todos_project_and_id_index.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+# See https://docs.gitlab.com/ee/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddTodosProjectAndIdIndex < Gitlab::Database::Migration[1.0]
+  # When using the methods "add_concurrent_index" or "remove_concurrent_index"
+  # you must disable the use of transactions
+  # as these methods can not run in an existing transaction.
+  # When using "add_concurrent_index" or "remove_concurrent_index" methods make sure
+  # that either of them is the _only_ method called in the migration,
+  # any other changes should go in a separate migration.
+  # This ensures that upon failure _only_ the index creation or removing fails
+  # and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  disable_ddl_transaction!
+
+  NEW_INDEX_NAME = 'index_todos_on_project_id_and_id'
+  OLD_INDEX_NAME = 'index_todos_on_project_id'
+
+  def up
+    add_concurrent_index :todos, [:project_id, :id], name: NEW_INDEX_NAME
+    remove_concurrent_index_by_name :todos, OLD_INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index :todos, :project_id, name: OLD_INDEX_NAME
+    remove_concurrent_index_by_name :todos, NEW_INDEX_NAME
+  end
+end