Update duckdb index files

.gitattributes

@@ -67,3 +67,4 @@ id/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 id/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 id_flat/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 id_flat/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+it/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

it/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6b9337a6346428571a3e8b2f68f4bcbf206b9a1fa66ded0e385a55470bebda30
+size 49557504