Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 nayohan--siqa-ko/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 nayohan--siqa-ko/valid/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 sha256:75843e723a9c691bb4eb0e1021be236c8c569584b1e5d649c083e2405382d8b3
+size 1585152