Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 voidful--EduQG/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 voidful--EduQG/validation/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:da34dfc8b31e48f5bfb8d978c3e68c8a924dd66fab8298f1bd307ac96a05f2d8
+size 25702400