Update duckdb index files

.gitattributes

@@ -39,3 +39,4 @@ cochrane/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cochrane/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cochrane/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ms2/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ms2/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

ms2/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:65913ef523710ac27f07b7064766ae46a79964600ae80de604ba97e3e3b289a0
+size 144453632