FEATURE: Introduce Ignore user (#7072)

app/models/ignored_user.rb

@@ -0,0 +1,20 @@
+class IgnoredUser < ActiveRecord::Base
+  belongs_to :user
+  belongs_to :ignored_user, class_name: "User"
+end
+
+# == Schema Information
+#
+# Table name: ignored_users
+#
+#  id            :integer          not null, primary key
+#  user_id       :integer          not null
+#  ignored_user_id :integer          not null
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
+#
+# Indexes
+#
+#  index_ignored_users_on_ignored_user_id_and_user_id  (ignored_user_id,user_id) UNIQUE
+#  index_ignored_users_on_user_id_and_ignored_user_id  (user_id,ignored_user_id) UNIQUE
+#