Update duckdb index files

.gitattributes

@@ -54,3 +54,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 xmediasum/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 xmediasum/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+xmediasum/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

xmediasum/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d0fe47e4092ff14a45646ecf6e496ba678878508fbce907616065c4f15d84769
+size 195833856