1 files changed, 28 insertions, 0 deletions
diff --git a/db/migrate/20170928124105_create_fork_networks.rb b/db/migrate/20170928124105_create_fork_networks.rb
new file mode 100644
index 00000000000..ca906b953a3
--- /dev/null
+++ b/db/migrate/20170928124105_create_fork_networks.rb
@@ -0,0 +1,28 @@
+class CreateForkNetworks < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    create_table :fork_networks do |t|
+      t.references :root_project,
+                   references: :projects,
+                   index: { unique: true }
+
+      t.string :deleted_root_project_name
+    end
+
+    add_concurrent_foreign_key :fork_networks, :projects,
+                               column: :root_project_id,
+                               on_delete: :nullify
+  end
+
+  def down
+    if foreign_keys_for(:fork_networks, :root_project_id).any?
+      remove_foreign_key :fork_networks, column: :root_project_id
+    end
+    drop_table :fork_networks
+  end
+end