Update duckdb index files

.gitattributes

@@ -5,3 +5,4 @@ ASCCCCCCCC--bill/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ASCCCCCCCC--bill/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1d5caa295458496b6bd9c0ce7801932e826af408473a0356c17a5185fb2ac8c4
+size 1847296