FIX: Clarify User.group_locked_trust_level.

* Rename User.group_locked_trust_level to User.group_granted_trust_level.

* Remove the column from users table.

app/models/user.rb

@@ -21,6 +21,10 @@ class User < ActiveRecord::Base
   include SecondFactorManager
   include HasDestroyedWebHook
 
+  self.ignored_columns = %w{
+    group_locked_trust_level
+  }
+
   has_many :posts
   has_many :notifications, dependent: :destroy
   has_many :topic_users, dependent: :destroy
@@ -342,6 +346,13 @@ class User < ActiveRecord::Base
     find_by(username_lower: username.downcase)
   end
 
+  def group_granted_trust_level
+    GroupUser
+      .where(user_id: id)
+      .includes(:group)
+      .maximum("groups.grant_trust_level")
+  end
+
   def enqueue_welcome_message(message_type)
     return unless SiteSetting.send_welcome_message?
     Jobs.enqueue(:send_system_message, user_id: id, message_type: message_type)