```ruby
# frozen_string_literal: true

namespace :one_off do
  # put your one off tasks here and delete them once they've been ran
  desc "set stable flag on all versions"
  task set_stable_versions: :environment do
    Version.find_in_batches do |versions|
      ActiveRecord::Base.transaction do
        versions.each do |v|
          v.update_column(:stable, v.stable_release?)
        end
      end
    end
  end

  desc "set stable flag on all tags"
  task set_stable_tags: :environment do
    Tag.find_in_batches do |tags|
      ActiveRecord::Base.transaction do
        tags.each do |t|
          t.update_column(:stable, t.stable_release?)
        end
      end
    end
  end
end
```

Add a task to remove hidden maven projects with no group id.
user
```ruby
# frozen_string_literal: true

namespace :one_off do
  # put your one off tasks here and delete them once they've been ran
  desc "set stable flag on all versions"
  task set_stable_versions: :environment do
    Version.find_in_batches do |versions|
      ActiveRecord::Base.transaction do
        versions.each do |v|
          v.update_column(:stable, v.stable_release?)
        end
      end
    end
  end

  desc "set stable flag on all tags"
  task set_stable_tags: :environment do
    Tag.find_in_batches do |tags|
      ActiveRecord::Base.transaction do
        tags.each do |t|
          t.update_column(:stable, t.stable_release?)
        end
      end
    end
  end

  desc "delete all hidden maven projects missing a group id"
  task delete_groupless_maven_projects: :environment do
    Project.
      where(platform: "Maven").
      where(status: "Hidden").
      where("name NOT LIKE '%:%'").
      find_each do |p|
        puts "Deleting Maven project #{p.name} (#{p.id})"
        p.destroy!
      end
  end
end
```
assistant