Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 ttss--rdf-triple/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ttss--rdf-triple/validation/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 sha256:9bc8a2aabf4c0778aaf6afc0721c7a506beaf0b54b5d8404f2a50a95357e5d9e
+size 1585152