Update duckdb index files

.gitattributes

@@ -53,3 +53,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpg 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/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:28d877cde696b3f69829a5cfd4698fba66c4891c80b00da8a3f67d27538bcc56
+size 1060864