feat: enhance database models with metadata and new resource types

models/__init__.py

@@ -1,6 +1,16 @@
-"""Database models for the CalMiner domain."""
+"""Database models and shared metadata for the CalMiner domain."""
 
 from .financial_input import FinancialCategory, FinancialInput
+from .metadata import (
+    COST_BUCKET_METADATA,
+    RESOURCE_METADATA,
+    STOCHASTIC_VARIABLE_METADATA,
+    CostBucket,
+    ResourceDescriptor,
+    ResourceType,
+    StochasticVariable,
+    StochasticVariableDescriptor,
+)
 from .project import MiningOperationType, Project
 from .scenario import Scenario, ScenarioStatus
 from .simulation_parameter import DistributionType, SimulationParameter
@@ -14,4 +24,12 @@ __all__ = [
     "ScenarioStatus",
     "DistributionType",
     "SimulationParameter",
+    "ResourceType",
+    "CostBucket",
+    "StochasticVariable",
+    "RESOURCE_METADATA",
+    "COST_BUCKET_METADATA",
+    "STOCHASTIC_VARIABLE_METADATA",
+    "ResourceDescriptor",
+    "StochasticVariableDescriptor",
 ]