Update duckdb index files

.gitattributes

@@ -2,3 +2,4 @@ At0x--AIUniverse/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 At0x--AIUniverse/parquet-train.parquet filter=lfs diff=lfs merge=lfs -text
 At0x--AIUniverse/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
+default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a74ea815353e381fbfab6022da7e011c3babcbb76edeaca087666079502b155e
+size 4206592