improved logging

python_app/orchestration/config_writer.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 from contextlib import suppress
 import json
+import logging
 import os
 from pathlib import Path
 
@@ -16,6 +17,8 @@ from python_app.orchestration.preprocess_assets import (
 )
 from python_app.storage.npz_store import NpzStore
 
+logger = logging.getLogger(__name__)
+
 
 class ConfigWriter:
     """Write runtime artifacts consumed by C++ processes."""
@@ -39,6 +42,7 @@ class ConfigWriter:
             spec = PREPROCESS_ASSET_SPECS[key]
             asset = preprocess_asset_model(config, key)
             bundle_path = self._runtime_dir / spec.runtime_filename
+            logger.debug("Exporting preprocess bundle %s (set=%s) -> %s", key, asset.set_name, bundle_path)
             store.export_set_bundle(spec.set_kind, radar_key, asset.set_name, bundle_path)
             asset.bundle_path = str(bundle_path)
 
@@ -63,10 +67,12 @@ class ConfigWriter:
                 os.fsync(handle.fileno())
             os.replace(tmp_path, output_path)
         except Exception:
+            logger.exception("Failed to write run config to %s; removing temp file", output_path)
             # Never leave a half-written .tmp behind on a write/fsync failure.
             with suppress(OSError):
                 tmp_path.unlink()
             raise
+        logger.debug("Wrote run config to %s (%d bytes)", output_path, len(serialized))
         return output_path