Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ Rosenberg--CMeEE/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Rosenberg--CMeEE/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Rosenberg--CMeEE/train/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:e04fc01678b3e9316a3c13d03b04367ddd2b9f85e23df2f2ed014330fa41f3ef
+size 7614464