Add drg_cms:clear_session rake task to clear robots visits from session collection.
user
```ruby
#--
# Copyright (c) 2012+ Damjan Rems
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#++

namespace :drgcms do
  desc 'Clears mongodb session collection.'
  task :clear_session, [:name] => :environment do |t, args|
# Pa poizkusaj ti primerjati dva datuma v MongoDB
    ActionDispatch::Session::MongoidStore::Session.all.each do |doc|
      doc.delete if (doc.created_at == doc.updated_at or doc.updated_at < 100.days.ago)
    end
    DcSite.collection.database.command(eval: "db.runCommand ( { compact: 'sessions' } )" )
  end
end
```
assistant