final db structure

db/migrate/20170403174309_create_lookups.rb

@@ -0,0 +1,9 @@
+class CreateLookups < ActiveRecord::Migration[5.0]
+  def change
+    create_table :lookups do |t|
+      t.string :lookup_type, :null => false
+      t.string :name, :null => false
+      t.string :value, :null => false
+    end
+  end
+end