Use DB for auth sessions (#1233)

* DB sessions

* Validations for profile image

test/models/current_test.rb

@@ -3,7 +3,7 @@ require "test_helper"
 class CurrentTest < ActiveSupport::TestCase
   test "family returns user family" do
     user = users(:family_admin)
-    Current.user = user
+    Current.session = user.sessions.create!
     assert_equal user.family, Current.family
   end
 end