Decouple Database Models from API Response Models

[Arthi-chaud]

There is a very strong coupling between the DB models and API responses. This leads to some overhead, e.g. Response Builders.

• There should be API-Specific models, uncoupled from the DB models
  • We could then remove the dependency to the prisma swagger model generator
• We should not need Response Builders for Illustrations

[Arthi-chaud]

Closes, since the synchronous response builders now makes this more acceptable