Update duckdb index files

.gitattributes

@@ -545,3 +545,4 @@ default/tig.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/tok.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/ro.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/mdf.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/th.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/th.validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ce854f32fd62fcbed94d68a75ceaf7d698812134ec7452191f5b02261e8c0f7e
+size 7352320