Migration and template for email invoice

migrations/108_email_invoice.rb

@@ -0,0 +1,9 @@
+Sequel.migration do
+  up {
+    DB.add_column :sites, :email_invoice, :boolean, default: false
+  }
+
+  down {
+    DB.drop_column :sites, :email_invoice
+  }
+end

views/templates/email/invoice.erb

@@ -0,0 +1,13 @@
+Neocities Invoice
+
+For: Neocities Supporter Account
+
+Date: <%= date.strftime("%D") %>
+
+Billing Period: <%= period_start.strftime("%D") %> - <%= period_end.strftime("%D") %>
+
+Amount: <%= Money.new(amount, "USD").format %>
+
+You have been successfully charged. Thank you for being a Neocities supporter!
+
+- The Neocities Team