Update duckdb index files

.gitattributes

@@ -17,3 +17,4 @@ default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0001.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0002.parquet filter=lfs diff=lfs merge=lfs -text
 default/test/0000.parquet filter=lfs diff=lfs merge=lfs -text
+default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5ca4606ae57ce067d61c8b6234b4fa03609354f2b26ecd629b0294f2ca7401cc
+size 2547527680