Update duckdb index files

.gitattributes

@@ -1,3 +1,4 @@
 met--Meti_ICT/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 met--Meti_ICT/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/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:dd52e67930cc18bac77631e822116a15736e54f94e84234eac896354c2c6e5a0
+size 1060864