Update duckdb index files

.gitattributes

@@ -28,3 +28,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 KTH--martin/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 KTH--martin/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/validation/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 sha256:6ba2290bdbe67dae55b9b3fbc9e77e2a5291db1e55a98d7c43e6d4ad5363c67f
+size 2633728