Page History

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1. When adding metadata check if context already exists and create new if it doesnt
2. Ability to edit context
3. Ability edit metadata
4. Create GUI to manipulate this new metadata
5. Store extractor metadata (on top of context metadata)
   1. store external services and libraries used
6. Create example extractor using this new representation
7. Add heartbeat for extractors that sends over extractor metadata and updates the heartbeat

Example json-ld document:

...

case class ExtractorInfo (
  id: UUID,
  name: String,
  description: String,
  creator: User,
  version: String,
  lastSeen: Date,
  contexts: List[UUID],
  external_services: List[URL],
  libraries: List[String],
  bibtex: List[String]
)