Update duckdb index files

.gitattributes

@@ -66,3 +66,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 3/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 3/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 4/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+4/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

4/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:352465bd451a0b588928474590dbfbcec332279505ca2059992d0b4e901dca34
+size 6565888