Update duckdb index files

.gitattributes

@@ -93,3 +93,4 @@ Keyboard/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Keyboard/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Magazine_Subscriptions/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Magazine_Subscriptions/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+Magazine_Subscriptions/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

Magazine_Subscriptions/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:17862d82d32bb2ed990deb6af73018c88c5f80e295da6f2a0b7b5a99683536e5
+size 1585152