fix(dag): add sys.path relative import and correct duckdb partition column

dags/dag_factory.py

@@ -1,9 +1,15 @@
 import os
+import sys
 import glob
 import yaml
 from datetime import datetime, timedelta
 from airflow import DAG
 
+# Ensure bundle/dags directory is on sys.path for relative helper imports
+current_dir = os.path.dirname(os.path.abspath(__file__))
+if current_dir not in sys.path:
+    sys.path.insert(0, current_dir)
+
 try:
     from airflow.providers.standard.operators.bash import BashOperator
     from airflow.providers.standard.operators.python import PythonOperator