Update duckdb index files

.gitattributes

@@ -15,3 +15,4 @@ hi/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 th/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 th/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+th/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

th/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6c3b3df25d957cacd20d22df3192962d023b9d80a40ab3f136caeb20ec0bb4ef
+size 1323008