adds paranoia to User

app/models/user.rb

@@ -1,9 +1,11 @@
 class User < ActiveRecord::Base
+  include ActsAsParanoidAliases
   apply_simple_captcha
   devise :database_authenticatable, :registerable, :confirmable,
          :recoverable, :rememberable, :trackable, :validatable
 
   acts_as_voter
+  acts_as_paranoid column: :hidden_at
 
   has_one :administrator
   has_one :moderator

db/migrate/20150819135933_add_hidden_at_to_users.rb

@@ -0,0 +1,6 @@
+class AddHiddenAtToUsers < ActiveRecord::Migration
+  def change
+    add_column :users, :hidden_at, :datetime
+    add_index :users, :hidden_at
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150817150457) do
+ActiveRecord::Schema.define(version: 20150819135933) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -137,16 +137,18 @@ ActiveRecord::Schema.define(version: 20150817150457) do
     t.datetime "confirmation_sent_at"
     t.string   "unconfirmed_email"
     t.string   "nickname"
-    t.string   "phone_number",            limit: 30
-    t.boolean  "use_nickname",            default: false, null: false
-    t.boolean  "email_on_debate_comment", default: false
-    t.boolean  "email_on_comment_reply",  default: false
+    t.boolean  "use_nickname",                       default: false, null: false
+    t.boolean  "email_on_debate_comment",            default: false
+    t.boolean  "email_on_comment_reply",             default: false
     t.string   "official_position"
-    t.integer  "official_level",          default: 0
+    t.integer  "official_level",                     default: 0
+    t.string   "phone_number",            limit: 30
+    t.datetime "hidden_at"
   end
 
   add_index "users", ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true, using: :btree
   add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree
+  add_index "users", ["hidden_at"], name: "index_users_on_hidden_at", using: :btree
   add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true, using: :btree
 
   create_table "visits", id: :uuid, default: nil, force: :cascade do |t|