Update duckdb index files

.gitattributes

@@ -14,3 +14,4 @@ hi/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hi/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 th/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+th/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

th/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:281c4afef73381ba6ea9c10c768eb4e65345109874eade72e3c602bc63bcf4c1
+size 1585152