Update duckdb index files

.gitattributes

@@ -54,3 +54,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 alexgrigoras--next-purchase-day/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+alexgrigoras--next-purchase-day/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

alexgrigoras--next-purchase-day/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:18065ce4b1c7562f73c15a3dc0ea51ff4d1d06c58f4d3a0900ee638804d9fc3e
+size 1060864