diff --git a/.gitignore b/.gitignore
index 3295861..2b09f0d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -72,3 +72,9 @@ performance_report.txt
 
 # Streamlit cache
 .streamlit/
+
+# Windows artefacts
+nul
+
+# One-off analysis scripts
+check_ml_data.py