Update duckdb index files

.gitattributes

@@ -35,3 +35,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.mp3 filter=lfs diff=lfs merge=lfs -text
 *.ogg filter=lfs diff=lfs merge=lfs -text
 *.wav filter=lfs diff=lfs merge=lfs -text
+C++-gpl-2.0/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text

C++-gpl-2.0/partial-train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f8c13e54e3431483371f65a6236bab6ac420347d68bc7f26dbdd398ac67e0834
+size 4938543104