Summary by cubic

Enable case payloads to be objects or arrays and add a UDF to append or replace payload data. This supports richer ingestion and safer incremental updates.

• New Features

  • Case payload now accepts object or array in API schemas, DB model (JSONB), and frontend viewer.
  • Added update_payload(case_id, payload, append=false): when append=true, dict+dict merges keys, list+list extends, and dict<->list converts and appends.

• Migration

  • Regenerate API/client types and update any code that assumed payload is always an object.
  • No backend data migration needed (JSONB unchanged); the UI already renders arrays and hides empty payloads.

^{Written for commit d33eaf0. Summary will update automatically on new commits.}