Update duckdb index files

.gitattributes

@@ -89,3 +89,4 @@ harem-default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 harem-default/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 harem-default/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 harem-selective/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+harem-selective/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

harem-selective/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4bab353245fa9ebb5e56fc8c275024eddcfc15aa41583c06bded7235f0c93317
+size 1060864