Delete old duckdb index files

default/refclef_berkeley_test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:ec4d47bb939b526a61cc44c5d9f1f52ca35899c2cdc9150add034aeb1d7463bd
-size 916729856

default/refclef_berkeley_val/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:3e854924ba1b14233d49b14dde1bf6ce9c5c001b3daf80776394569d8f7f6c22
-size 92549120

default/refclef_unc_testA/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:c1d289b30c8e04829f8095c42c0e880b62bc586a9af466a51fc1b2fd17098764
-size 39858176

default/refclef_unc_testB/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:c5d45192d092c1a500a4dcf4d40b07ebb1106ca490e19ab212ab7be32a2701c7
-size 42479616

default/refclef_unc_testC/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:cbf72d0a3b36a6b74c2f03cde0a4c17dff561f7023d6d5450706f149650f40a5
-size 38285312

default/refclef_unc_val/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:dd4bd19938854fd363d1669e0d73bd50350902658162c23340a30b1196937b60
-size 184037376