Update duckdb index files

.gitattributes

@@ -26,3 +26,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zstandard filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
 split/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+split/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

split/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:606c528f827610a7d6ad4ef0f1cd89455f034d378c6514260fff974f43cfe890
+size 1323008