Update duckdb index files

.gitattributes

@@ -59,3 +59,4 @@ intensity/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 binary/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 intensity/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/index.duckdb 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:b20484e2145f0bfd1586906ca68af41e5831eedaa958e7a05f41ff99d5fa0ccc
+size 2633728