Update duckdb index files

.gitattributes

@@ -70,3 +70,4 @@ arxiv-full/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 arxiv-0.60-to-1.00/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 code-python-0.50-to-1.00/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 web-0.50-to-1.00/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+arxiv-0.50-to-1.00/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text

arxiv-0.50-to-1.00/partial-train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ae9098d23efd986233f73450c1dac2d53e5ca0c7bf4bb2ad7e67adb541a8aa5b
+size 4162072576