Update duckdb index files

.gitattributes

@@ -4,3 +4,4 @@ arbml--ESCWA/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 arbml--ESCWA/train/0001.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0001.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 sha256:7d869b0bb73bf1c2f096354fd6b348112756b7b99319c7a156fb1a526443627c
+size 669265920