Update duckdb index files

.gitattributes

@@ -54,3 +54,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 UCC_EN_TH.csv filter=lfs diff=lfs merge=lfs -text
 nakcnx--Thai-UCC/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ea534b3925b0a6acd4a14930256264dc70d37a638ba08d3017884678616245eb
+size 18624512