FIX: permalinks table: increase limit of url column, make url index unique

db/migrate/20140828200231_make_url_col_bigger_in_permalinks.rb

@@ -0,0 +1,10 @@
+class MakeUrlColBiggerInPermalinks < ActiveRecord::Migration
+  def up
+    remove_index :permalinks, :url
+    change_column :permalinks, :url, :string, limit: 1000, null: false
+    add_index :permalinks, :url, unique: true
+  end
+
+  def down
+  end
+end