Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 ttss--rdf-query-based-summarization/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ttss--rdf-query-based-summarization/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

ttss--rdf-query-based-summarization/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8d5317a8cf8d3217636b78900be1f03fc2ed304748d1349d0df54ae25d2ce21d
+size 2109440