Update duckdb index files

.gitattributes

@@ -2,3 +2,4 @@ airline-sentiment/crowdflower-train.parquet filter=lfs diff=lfs merge=lfs -text
 economic-news/crowdflower-train.parquet filter=lfs diff=lfs merge=lfs -text
 text_emotion/crowdflower-train.parquet filter=lfs diff=lfs merge=lfs -text
 airline-sentiment/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+corporate-messaging/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

corporate-messaging/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c665005aa8a222291471da3b16d420985e9c2ae14cb6f2f35ed71de863057800
+size 1585152