Update duckdb index files

.gitattributes

@@ -3,3 +3,4 @@ Gabriel--citesum_swe/parquet-validation.parquet filter=lfs diff=lfs merge=lfs -t
 Gabriel--citesum_swe/parquet-test.parquet filter=lfs diff=lfs merge=lfs -text
 Gabriel--citesum_swe/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Gabriel--citesum_swe/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Gabriel--citesum_swe/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

Gabriel--citesum_swe/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:940545fd6b19993ec65440521913cd4cf272dd33c793a010e748ee8249e71f98
+size 24653824