Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ renyulin--test_ds/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 renyulin--test_ds/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 sha256:203fa93bb09097fbc312530d97db2e669c44dfcc32b9c79e0e22a8c2dc603874
+size 1585152