Not necessarily. If I initialize Ashikawa::Core as follows:

```ruby
Ashikawa::Core::Database.new do |config|
  config.url = 'http://localhost:8529'
end
```

It does default to the `_system` database. This is for backwards compatability reasons in ArangoDB. I could of course change this behavior in Ashikawa and always attach `_db/_system` if the user did not provide a database. But this would have been out of scope for this PR.