Update duckdb index files

.gitattributes

@@ -55,3 +55,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 bg_other/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bg_other/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 bg_all/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+bg_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

bg_contracts/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3e7b7db8bfa1cfe3fc06d2ef3c0e7c5045380ca934407c199ef8bbffddb4c992
+size 13643776