Update duckdb index files

.gitattributes

@@ -295,3 +295,4 @@ cs_ru/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_th/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_th/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_th/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs_th/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs_th/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4ab9e32e5b0556ac600dd1a61d40ec5c0426a2b70269da239132ab2867de2651
+size 94384128