Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 *.jsonl.gz filter=lfs diff=lfs merge=lfs -text
+default/csl/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/csl/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:98f33700dff691313c7f4e482ef66cc8928b694537817b14d57c27194511f47c
+size 262680576