purge data from history

.github/workflows/main.yml

@@ -41,6 +41,10 @@ jobs:
             git commit -m "Configure Git LFS for data folder"
           fi
 
+      - name: Rewrite history to move data files into LFS
+        run: |
+          git lfs migrate import --yes --include="data/**,*.txt,*.csv,*.nc" --include-ref=refs/heads/main
+
       - name: Re-add data files with LFS filters
         run: |
           git add --renormalize data || true