Implement display artifacts, pricing integrity, draft base and publish preview bundle

backend/app/services/draft_guard.py

@@ -0,0 +1,20 @@
+from fastapi import HTTPException, status
+
+from app.repositories.scheme_versions import get_current_scheme_version
+from app.repositories.schemes import get_scheme_record_by_scheme_id
+
+
+async def get_current_draft_context(scheme_id: str):
+    scheme = await get_scheme_record_by_scheme_id(scheme_id)
+    version = await get_current_scheme_version(
+        scheme_id=scheme.scheme_id,
+        current_version_number=scheme.current_version_number,
+    )
+
+    if version.status != "draft" or scheme.status != "draft":
+        raise HTTPException(
+            status_code=status.HTTP_409_CONFLICT,
+            detail="Current scheme version is not editable because it is not in draft state",
+        )
+
+    return scheme, version