Update duckdb index files

.gitattributes

@@ -67,3 +67,4 @@ clinical_medicine/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 civil_servant/val/index.duckdb filter=lfs diff=lfs merge=lfs -text
 clinical_medicine/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 clinical_medicine/val/index.duckdb filter=lfs diff=lfs merge=lfs -text
+college_economics/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text

college_economics/dev/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:52ffc6eec72c9e9f8a17f9f95293bda76947bfa2f68636d4ae09975118fc811e
+size 1060864