1 files changed, 35 insertions, 0 deletions
diff --git a/db/migrate/20200305020459_add_label_restore_foreign_keys.rb b/db/migrate/20200305020459_add_label_restore_foreign_keys.rb
new file mode 100644
index 00000000000..4b7c68cb20b
--- /dev/null
+++ b/db/migrate/20200305020459_add_label_restore_foreign_keys.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class AddLabelRestoreForeignKeys < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    # create foreign keys
+    connection.foreign_keys(labels_table_name).each do |fk|
+      fk_options = fk.options
+      add_concurrent_foreign_key(backup_labels_table_name, fk.to_table, name: fk.name, column: fk_options[:column])
+    end
+  end
+
+  def down
+    connection.foreign_keys(backup_labels_table_name).each do |fk|
+      with_lock_retries do
+        remove_foreign_key backup_labels_table_name, name: fk.name
+      end
+    end
+  end
+
+  private
+
+  def labels_table_name
+    :labels
+  end
+
+  def backup_labels_table_name
+    :backup_labels
+  end
+end