fix: refresh matrix and head_matrix tables

Author: bethesque

db/migrations/20180330_refresh_matrix.rb

@@ -0,0 +1,12 @@
+Sequel.migration do
+  up do
+    from(:materialized_matrix).delete
+    from(:materialized_matrix).insert(from(:matrix).select_all)
+    from(:materialized_head_matrix).delete
+    from(:materialized_head_matrix).insert(from(:head_matrix).select_all)
+  end
+
+  down do
+
+  end
+end