Update duckdb index files

.gitattributes

@@ -73,3 +73,4 @@ left_center_single_right_center_single/test/index.duckdb filter=lfs diff=lfs mer
 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/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

up_center_single_down_center_single/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4f2b128797c3a29fc0322f3d79955ba82b4e96484b060ca4260440a44f2664c9
+size 146550784