refactor(db)!: finalize pooled WNDB v2 migration

app/api/v1/endpoints/model_import.py

@@ -12,6 +12,7 @@ from fastapi import (
     UploadFile,
     status,
 )
+from starlette.concurrency import run_in_threadpool
 
 from app.auth.metadata_dependencies import (
     get_current_metadata_admin,
@@ -24,6 +25,7 @@ from app.auth.project_dependencies import (
 from app.core.audit import AuditAction, log_audit_event
 from app.infra.db.metadb.repositories.metadata_repository import MetadataRepository
 from app.infra.db.project_routing import activate_project_routing
+from app.native.wndb.core.database import MaterializedViewRefreshAfterCommitError
 from app.services.network_import import network_update
 from app.services.tjnetwork import run_inp
 
@@ -87,8 +89,8 @@ def _validate_inp_bytes(content: bytes, filename: str) -> str:
 async def _read_upload(file: UploadFile) -> tuple[bytes, str]:
     filename = Path(file.filename or "").name
     content = await file.read(MAX_INP_FILE_BYTES + 1)
-    _validate_inp_bytes(content, filename)
-    return content, filename
+    normalized = _validate_inp_bytes(content, filename).encode("utf-8")
+    return normalized, filename
 
 
 async def _audit_model_change(
@@ -114,7 +116,7 @@ async def _audit_model_change(
     )
 
 
-async def _run_uploaded_inp(content: bytes) -> str:
+def _run_uploaded_inp_sync(content: bytes) -> str:
     target_dir = Path("inp")
     target_dir.mkdir(parents=True, exist_ok=True)
     model_name = f"admin_model_{uuid4().hex}"
@@ -123,7 +125,11 @@ async def _run_uploaded_inp(content: bytes) -> str:
     return run_inp(model_name)
 
 
-async def _update_from_inp(content: bytes, project_code: str) -> None:
+async def _run_uploaded_inp(content: bytes) -> str:
+    return await run_in_threadpool(_run_uploaded_inp_sync, content)
+
+
+def _update_from_inp_sync(content: bytes, project_code: str) -> None:
     temp_path: Path | None = None
     try:
         with NamedTemporaryFile(suffix=".inp", delete=False) as temp_file:
@@ -135,9 +141,15 @@ async def _update_from_inp(content: bytes, project_code: str) -> None:
             temp_path.unlink(missing_ok=True)
 
 
+async def _update_from_inp(content: bytes, project_code: str) -> None:
+    await run_in_threadpool(_update_from_inp_sync, content, project_code)
+
+
 async def _apply_model_update(content: bytes, project_code: str) -> None:
     try:
         await _update_from_inp(content, project_code)
+    except MaterializedViewRefreshAfterCommitError:
+        raise
     except Exception as exc:
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,