UnknownWorkflow too

src/simstadt/results/__init__.py

@@ -7,6 +7,7 @@ from .photovoltaic import PhotovoltaicResults
 from .providers import Providers
 from .solar_potential import SolarPotentialResults
 from .energy_grid import EnergyGridResults
+from .unknown_workflow import UnknownWorkflowResults
 
 
 def create_simstadt_results(description: str, output_files: list) -> SimStadtResults:
@@ -27,6 +28,7 @@ __all__ = [
     "LoadProfileResults",
     "SolarPotentialResults",
     "GreenWaterResults",
+    "UnknownWorkflowResults",
     "create_simstadt_results",
     "detect_decimal",
     "get_workflow_provider",

src/simstadt/results/base.py

@@ -242,6 +242,7 @@ class SimStadtResults(ABC):
     @classmethod
     def create(cls, provider: str, **kwargs) -> "SimStadtResults":
         if provider not in cls._registry:
-            # TODO: Warning, and return GenericSimStadtResult instead?
-            raise ValueError(f"Unknown workflow provider: {provider}")
+            from .unknown_workflow import UnknownWorkflowResults
+            logger.warning("Unknown workflow provider: %s. Returning UnknownWorkflowResults.", provider)
+            return UnknownWorkflowResults(**kwargs)
         return cls._registry[provider](**kwargs)

src/simstadt/results/unknown_workflow.py

+from dataclasses import dataclass
+from typing import ClassVar
+
+import pandas as pd
+
+from .base import SimStadtResults
+from .kpi import KPI
+
+
+@dataclass(repr=False)
+class UnknownWorkflowResults(SimStadtResults):
+    """Fallback for unrecognized workflow providers."""
+
+    supported_providers: ClassVar[list[str]] = []
+    csv_identifier: ClassVar[str] = ""
+
+    def _parse_results(self) -> pd.DataFrame:
+        return pd.DataFrame()
+
+    @property
+    def kpis(self) -> list[KPI]:
+        return []