Update duckdb index files

.gitattributes

@@ -2,3 +2,4 @@ olpa--jbo-corpus/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 olpa--jbo-corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 olpa--jbo-corpus/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/index.duckdb 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:c25b07dfa84ec43c5d053f558316b1287d1bcf84c7340a7ef934113f929358f0
+size 3158016