feat: complete catalog-driven preprocessing

deploy/workspaces/example.yaml

@@ -2,18 +2,11 @@ workspace:
   schema_version: 4
   id: example
   name: Example workspace
-  description: Generic example WorkspaceV4 descriptor.
+  description: Database-free WorkspaceV4 descriptor; PostgreSQL Catalog owns database metadata.
   language: en
 
-dwh:
-  engine: postgres
-  database: postgres
-  schema: datawarehouse
-  supported_transports:
-    - postgres_direct
-    - rest_api
-
 evidence:
+  schema_version: 1
   source:
     type: filesystem
     uri: example/evidence
@@ -23,12 +16,3 @@ evidence:
   policy:
     max_chunk_chars: 4000
     retain_published_generations: 3
-
-diagnostics:
-  dwh_rest:
-    method: GET
-    path: /health
-    auth: none
-    response:
-      database: database
-      schema: schema