Update duckdb index files

.gitattributes

@@ -65,3 +65,4 @@ ibo/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ibo/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ibo/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 kin/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+kin/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

kin/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fb141beedb5720fe9953a647712258348e54646999b658bc20e529cd8935a70b
+size 1060864