Update duckdb index files

.gitattributes

@@ -59,3 +59,4 @@ siyangliu--reddit_mhp/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 siyangliu--reddit_mhp/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 lsy641--reddit_mhp/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 lsy641--reddit_mhp/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+lsy641--reddit_mhp/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

lsy641--reddit_mhp/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b576fce12ede462a7b06e6ce51433a7418956906f4d7b655f90672d4b0b4fcab
+size 3944448