Update duckdb index files

.gitattributes

@@ -349,3 +349,4 @@ default/bn.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/bn.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/ba.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/br.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/br.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/br.validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bb95331b736d4ef00cf84abedaf4684e0705ca38c8d79dbf74a33e59d3334c04
+size 1847296