Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 nayohan--piqa-ko/valid/index.duckdb filter=lfs diff=lfs merge=lfs -text
 nayohan--piqa-ko/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/valid/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/valid/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c9df9136c3701fade61a0e104e5ae08c3e01f7ba33b8a325e147f9e10d31a057
+size 1585152