Merge pull request #966 from PolicyEngine/codex/h5-migration-pr6-selection-reindexing

Extract local H5 selection and cloning seams

Author: anth-volk

changelog.d/965.added

@@ -0,0 +1 @@
+Extract local H5 clone selection, entity reindexing, and variable cloning into dedicated build-output seams.

policyengine_us_data/build_outputs/__init__.py

@@ -5,5 +5,6 @@
 H5 output request construction, exact calibration geography loading,
 fingerprinting, clone-weight shape contracts, worker partitioning, source
 dataset snapshot contracts, worker input normalization, worker-bootstrap
-artifacts, and worker-scoped session and validation context setup.
+artifacts, worker-scoped session and validation context setup, microsimulation
+access helpers, clone selection, entity reindexing, and source-variable cloning.
 """

policyengine_us_data/build_outputs/fingerprinting.py

@@ -11,6 +11,7 @@
 from policyengine_us_data.pipeline_metadata import pipeline_node
 
 from .geography_loader import CalibrationGeographyLoader
+from .simulation_access import calculate_variable_values
 
 FingerprintScope = Literal["regional", "national"]
 ScopeFingerprint = str
@@ -409,4 +410,9 @@ def _infer_n_records(
         from policyengine_us import Microsimulation
 
         simulation = Microsimulation(dataset=str(source_dataset_path))
-        return int(len(simulation.calculate("household_id", map_to="household").values))
+        household_ids = calculate_variable_values(
+            simulation,
+            "household_id",
+            map_to="household",
+        )
+        return int(len(household_ids))