Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ Yuhthe--vietnews/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Yuhthe--vietnews/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/validation/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 sha256:86b45760d775cab82be8659dc182d0f266f1b7d6269d1a34677aae4f74c365c2
+size 687616000