Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ default/anime.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/ja.stackoverflow.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/japanese.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/anime.stackexchange.com_simple/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/ja.stackoverflow.com_simple/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/ja.stackoverflow.com_simple/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:095a914f01ab6fc72935c228fbcd35b5b267992d5b474e0746d17f72587ec7fa
+size 202911744