Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ saved_model/**/* 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/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

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

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:18f27dbe892e61eb681da5bc213e475276bf1a14dccd6fec2d7b18b37d4558ad
+size 1060864