Add dumpversion

server/extension/cdb_dataservices_server--0.12.0--0.13.0.sql

@@ -140,4 +140,10 @@ RETURNS SETOF cdb_dataservices_server.isoline AS $$
   result = plpy.execute(mapzen_plan, [username, orgname, type, source, mode, range, options])
 
   return result
-$$ LANGUAGE plpythonu;
+$$ LANGUAGE plpythonu;
+
+CREATE OR REPLACE FUNCTION cdb_dataservices_server.obs_dumpversion(username text, orgname text)
+RETURNS text AS $$
+  CONNECT cdb_dataservices_server._obs_server_conn_str(username, orgname);
+  SELECT cdb_observatory.obs_dumpversion();
+$$ LANGUAGE plproxy;