Update duckdb index files

.gitattributes

@@ -63,3 +63,4 @@ autorec/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 autorec/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 formatted/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 formatted/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+formatted/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

formatted/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e79e8f59307383e1b08463a6f9085bdc927076e78ddf3373aa11dc7ac06205da
+size 8138752