westeurope-1 — data model instances not persisting; instances.list returns 400 "value must not be null" (cdf-bootcamp-50-prod)

Hi team, we're seeing what looks like a backend issue on westeurope-1 during the Cognite bootcamp.

Environment
- Cluster: westeurope-1
- Projects: cdf-bootcamp-50-prod (also observed in cdf-bootcamp-43-prod)
- Time: ~14:40 CEST, 1 Sep 2026

Symptom
- Transformations and hosted extractors report success / Running, but no instances appear in the data model (Flows/Search is empty).
- The datapoints Cognite Function fails when querying the data model:
  client.data_modeling.instances.list(...) ->
  CogniteAPIError: Request had 1 constraint violations ... [value must not be null] | code: 400 | cluster: westeurope-1 | project: cdf-bootcamp-50-prod
  X-Request-ID: 98821131-2f58-9cb9-84bf-b1f9368e4655

What we've ruled out
- Same code/config works in -test.
- Toolkit deploy is green; auth verified; extractors and transformations run without errors.
- Instructor indicated westeurope-1 may be having issues.

Question
- Is there a known incident on westeurope-1 affecting data-model instance writes/reads right now? Any ETA? Anything we should re-run once it recovers?

Thanks!