diff --git a/eval_records.py b/eval_records.py
index bc0f7dd..48585e7 100644
--- a/eval_records.py
+++ b/eval_records.py
@@ -111,16 +111,24 @@ for day in day_list:
 
 	for filename in file_list:
 		file_path = os.path.join(day_path, filename)
+		print(f"Open file: {filename}")
 		with open(file_path, "r") as fp:
 			records = json.load(fp)
+			print(f"Found {len(records)} records")
 			for record in records:
 				try:
+					vehicle_data = record['data']
 					if record['info']['is_delta']:
-						record = deep_merge(last, record['data'])
+						print(f"Found delta record {record['info']['record_id']}")
+						vehicle_data = deep_merge(last, record['data'])
+						record['data'] = vehicle_data
+					else:
+						print(f"Found full record {record['info']['record_id']}")
+
 				except KeyError:
 					pass
 
-				last = record
+				last = vehicle_data
 				try:
 					for end_point in end_points:
 						end_point.assign(record)