Update duckdb index files

.gitattributes

@@ -60,3 +60,4 @@ default/anime.stackexchange.com_simple/index.duckdb filter=lfs diff=lfs merge=lf
 default/ja.stackoverflow.com_simple/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/japanese.stackexchange.com_simple/index.duckdb filter=lfs diff=lfs merge=lfs -text
 anime.stackexchange.com/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+anime.stackexchange.com_simple/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

anime.stackexchange.com_simple/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:943b1d9fe9975ae41cda8aea50d9908ed5b82e63866ef08c14790547bbfbfdc5
+size 66334720