Update duckdb index files

.gitattributes

@@ -60,3 +60,4 @@ KaiLv--UDR_Python/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/debug/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 sha256:31908e93c7bf8575231d4c53d69a1cace90ce13b5c5e0ebfb7c510a0ac8bd9ec
+size 11284480