Update duckdb index files

.gitattributes

@@ -69,3 +69,4 @@ hi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ig/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 lg/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 nso/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+sn/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

sn/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7bd4b55090088e14fe0360db344a1dca0df83c56bb9e88c451f6bda720317b41
+size 367276032