```ruby
module CoursemologyV1::Source
  def_model 'user_courses', 'announcements', 'achievements', 'levels', 'user_achievements'
end
```

Remove duplicate declaration of user_achievements
user
```ruby
module CoursemologyV1::Source
  def_model 'user_courses', 'announcements', 'achievements', 'levels'
end
```
assistant