Update duckdb index files

.gitattributes

@@ -54,3 +54,4 @@ 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
 default/balanced_train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/unbalanced_train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/unbalanced_train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f1096749d123134cafff56cb092b52a84d6764ced3bfe43657ce409b665125d1
+size 109326336