Update duckdb index files

.gitattributes

@@ -4,3 +4,4 @@ Aniemore--REPV-S/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Aniemore--REPV-S/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/test/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 sha256:4fb421200c7f7a914ddbc27794484927f48a4382714e7771af25c5289cbd09ed
+size 28585984