Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ stackmathqa100k/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 stackmathqa1600k/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 stackmathqa200k/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 stackmathqa400k/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+stackmathqa800k/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

stackmathqa800k/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a66ee3cb5dd1a41e515be78ef6cfc902faa7201e0b7c0b46b9aaf1c5f66211e7
+size 1553215488