Update duckdb index files

.gitattributes

@@ -97,3 +97,4 @@ Github/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 HackerNews/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 OpenSubtitles/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 OpenWebText2/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+UPSTO[[:space:]]Backgrounds/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text

UPSTO Backgrounds/partial-train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bf35feb2ce6305dc2789c0060ce761cdc734ee0d95f2aee477d24864d103c0bd
+size 6355955712