```ruby
class MedicalSafetyAlert < AbstractDocument
  def self.tag_metadata_keys
    %w(
      alert_type
      medical_specialism
    )
  end
end
```

Add issued date to medical safety alerts
user
```ruby
class MedicalSafetyAlert < AbstractDocument
  def self.tag_metadata_keys
    %w(
      alert_type
      medical_specialism
    )
  end

  def self.date_metadata_keys
    %w(
      issued_date
    )
  end

  def self.metadata_name_mappings
    {
      "issued_date" => "Issued",
    }
  end
end
```
assistant