Update duckdb index files

.gitattributes

@@ -20,3 +20,4 @@ analytic/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 boolean/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 boolean/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 comparative/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+comparative/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

comparative/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8b8631cf2e427f252614859e64e75bf92fc44a3d95a9a8982f982a6169924d33
+size 1060864