Update duckdb index files

.gitattributes

@@ -61,3 +61,4 @@ dublin_repair/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 newcaledonia_data/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 newcaledonia_metadata/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 singapore_data/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+singapore_metadata/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

singapore_metadata/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e432ef5bbed150f07d82bf835828105eaf72317208493b7cbd6b96f755810ea9
+size 1060864