Update duckdb index files

.gitattributes

@@ -25,3 +25,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zstandard filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+cs/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8d970ad08917f1773d85b583d5278ff99c74617f6a01f6e257d01c272b3f9b16
+size 7614464