Migrate to separate tokens table

db/migrate/20170210180426_remove_tokens_from_users.rb

+class RemoveTokensFromUsers < ActiveRecord::Migration[5.0]
+  def up
+    remove_column :users, :confirmation_token
+    remove_column :users, :password_reset_token
+
+    create_table :tokens do |t|
+      t.string    :token
+      t.datetime  :expires
+      t.string    :tokentype
+      t.integer   :user_id
+      t.index ["token"], name: "index_tokens_on_token", unique: true
+    end
+  end
+
+  def down
+    add_column :users, :confirmation_token, :string
+    add_column :users, :password_reset_token, :string
+
+    drop_table :tokens
+  end
+end

db/schema.rb

 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20161231185937) do
+ActiveRecord::Schema.define(version: 20170210180426) do
 
   create_table "activities", force: :cascade do |t|
     t.string   "public_name"
     t.index ["user_id"], name: "index_sessions_on_user_id"
   end
 
+  create_table "tokens", force: :cascade do |t|
+    t.string   "token"
+    t.datetime "expires"
+    t.string   "tokentype"
+    t.integer  "user_id"
+    t.index ["token"], name: "index_tokens_on_token", unique: true
+  end
+
   create_table "users", force: :cascade do |t|
     t.string   "email"
     t.string   "password_digest"
-    t.string   "confirmation_token"
-    t.string   "password_reset_token"
     t.integer  "person_id"
-    t.datetime "created_at",           null: false
-    t.datetime "updated_at",           null: false
+    t.datetime "created_at",      null: false
+    t.datetime "updated_at",      null: false
     t.index ["email"], name: "index_users_on_email", unique: true
     t.index ["person_id"], name: "index_users_on_person_id", unique: true
   end