Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ NEUDM--acos/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 NEUDM--acos/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:af559d6a768ed58da310da02142f737f166b7dcea0759f44ea036836cac0e5fb
+size 1060864