PERF: finalize porting to new incoming links structure

app/models/incoming_domain.rb

@@ -1,4 +1,32 @@
 class IncomingDomain < ActiveRecord::Base
+  def self.add!(uri)
+    name = uri.host
+    https = uri.scheme == "https"
+    port = uri.port
+
+    current = find_by(name: name, https: https, port: port)
+    return current if current
+
+    # concurrency ...
+
+    begin
+      current = create!(name: name, https: https, port: port)
+    rescue
+      # duplicate key is just ignored
+    end
+
+    current || find_by(name: name, https: https, port: port)
+  end
+
+  def to_url
+    url = "http#{https ? "s" : ""}://#{name}"
+
+    if https && port != 443 || !https && port != 80
+      url << ":#{port}"
+    end
+
+    url
+  end
 end
 
 # == Schema Information