Update duckdb index files

.gitattributes

@@ -2,3 +2,4 @@ arbml--antcorpus/parquet-train.parquet filter=lfs diff=lfs merge=lfs -text
 arbml--antcorpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 arbml--antcorpus/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/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:77a4239baf18eb2c2f7c914283f74fb0d1c87c9a39d70f8c674215382a8bd422
+size 23343104