Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ silkski--ENERAD/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 silkski--ENERAD/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/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 sha256:91e24868eea6236b91b920cc4e7ee2ea179b59baa56a2f95b935ca2cc062e2e7
+size 1060864