1 files changed, 21 insertions, 0 deletions
diff --git a/db/migrate/20200729181641_add_index_to_resource_milestone_events_add_events.rb b/db/migrate/20200729181641_add_index_to_resource_milestone_events_add_events.rb
new file mode 100644
index 00000000000..438f9c6bfa3
--- /dev/null
+++ b/db/migrate/20200729181641_add_index_to_resource_milestone_events_add_events.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class AddIndexToResourceMilestoneEventsAddEvents < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  INDEX_NAME = 'index_resource_milestone_events_on_milestone_id_and_add_action'
+  ADD_ACTION = '1'
+
+  def up
+    # Index add milestone events
+    add_concurrent_index :resource_milestone_events, :milestone_id, where: "action = #{ADD_ACTION}", name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index :resource_milestone_events, :milestone_id, name: INDEX_NAME
+  end
+end