Update duckdb index files

.gitattributes

@@ -68,3 +68,4 @@ BA/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 BA/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 BA/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 pretrain-labeled/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+pretrain-labeled/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

pretrain-labeled/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2fa1be374620c41fbe907f528c62165698ba81376304581f7d8c0723dd829b0d
+size 13643776