Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ goodsmile-figma/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 spiritale/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 tokyofigure/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 myethos/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+kotobukiya/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

kotobukiya/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e93c08861bb26edc16aa66db3191cc3d25efb1a56f548c0f1c012668eef5df7f
+size 2371584