1 files changed, 20 insertions, 0 deletions
diff --git a/db/migrate/20210529164247_change_iterations_title_uniqueness_index.rb b/db/migrate/20210529164247_change_iterations_title_uniqueness_index.rb
new file mode 100644
index 00000000000..47e7e2c757d
--- /dev/null
+++ b/db/migrate/20210529164247_change_iterations_title_uniqueness_index.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class ChangeIterationsTitleUniquenessIndex < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  INDEX_NAME = 'index_sprints_on_iterations_cadence_id_and_title'
+  OLD_INDEX_NAME = 'index_sprints_on_group_id_and_title'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :sprints, [:iterations_cadence_id, :title], name: INDEX_NAME, unique: true
+    remove_concurrent_index_by_name :sprints, OLD_INDEX_NAME
+  end
+
+  def down
+    # noop
+    # rollback would not work as we can have duplicate records once the unique `index_sprints_on_group_id_and_title` index is removed
+  end
+end