Update duckdb index files

.gitattributes

@@ -1,3 +1,4 @@
 leo19941227--g2p/text-train.parquet filter=lfs diff=lfs merge=lfs -text
 leo19941227--g2p/train/index.duckdb 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:eb513426ea426cf7f1c74ae2a3ae976fe63f72b62365d1a1f25014eea6d6fd97
+size 20721664