Update duckdb index files

.gitattributes

@@ -114,3 +114,4 @@ metrology_engineer/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 metrology_engineer/val/index.duckdb filter=lfs diff=lfs merge=lfs -text
 middle_school_chemistry/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 middle_school_chemistry/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+middle_school_chemistry/val/index.duckdb filter=lfs diff=lfs merge=lfs -text

middle_school_chemistry/val/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1ef7a0a32b01fce477292bff925cd85fee0b3843601e2b42631e6390d3d77297
+size 1060864