Update duckdb index files

.gitattributes

@@ -59,3 +59,4 @@ mfromm--AMSR/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 mfromm--AMSR/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 mfromm--AMSR/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:aa11e517c1bc41336cab4d93ffa43053efc38d9b2157723f13b0262cc9ce8671
+size 1585152