Update duckdb index files

.gitattributes

@@ -72,3 +72,4 @@ left_center_single_right_center_single/train/index.duckdb filter=lfs diff=lfs me
 left_center_single_right_center_single/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 left_center_single_right_center_single/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 up_center_single_down_center_single/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+up_center_single_down_center_single/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

up_center_single_down_center_single/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ec228d0b60b33fdf12c0a500edba3ab082d6f38b6821ac54a2beb66458ddcc59
+size 50343936