interface ExtractionResult {
  title: string | null
  content: string
  author: string | null
  author_url: string | null
  media_urls: string[]
  source_date: string | null
  source_type: SourceType
  raw_content: Record<string, unknown>
  metadata: Record<string, unknown>
}

interface Extractor {
  extract(input: string): Promise<ExtractionResult>
}

interface CategorizationResult {
  category: string
  subcategories: string[]
  tags: string[]
  summary: string
  language: string
  entities: Entity[]
}