Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpg filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
+Corianas--EnglishGrader/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

Corianas--EnglishGrader/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2fd6327a26deedce56273b0a41cce3eb11ca547a6c92857853296ebe1380d447
+size 9449472