Update duckdb index files

.gitattributes

@@ -1,2 +1,3 @@
 Nithiwat--claim-detection/parquet-train.parquet filter=lfs diff=lfs merge=lfs -text
 Nithiwat--claim-detection/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Nithiwat--claim-detection/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

Nithiwat--claim-detection/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:159d2c81fb3ffd440d59ba737205900d8c7de9cb2bbc2ef5521ea3e7ddefdba6
+size 3420160