Adding comment column

lib/ProxySQL_Admin.cpp

@@ -7732,7 +7732,7 @@ void ProxySQL_Admin::disk_upgrade_mysql_servers() {
                 // create new table
                 configdb->build_table((char *)"mysql_servers",(char *)ADMIN_SQLITE_TABLE_MYSQL_SERVERS,false);
                 // copy fields from old table
-                configdb->execute("INSERT INTO mysql_servers (hostgroup_id,hostname,port,status,weight,compression,max_connections,max_replication_lag,use_ssl,max_latency_ms) SELECT hostgroup_id,hostname,port,status,weight,compression,max_connections,max_replication_lag,use_ssl,max_latency_ms FROM mysql_servers_v130");
+                configdb->execute("INSERT INTO mysql_servers (hostgroup_id,hostname,port,status,weight,compression,max_connections,max_replication_lag,use_ssl,max_latency_ms,comment) SELECT hostgroup_id,hostname,port,status,weight,compression,max_connections,max_replication_lag,use_ssl,max_latency_ms,comment FROM mysql_servers_v130");
 	}
 	rci=configdb->check_table_structure((char *)"mysql_replication_hostgroups",(char *)ADMIN_SQLITE_TABLE_MYSQL_REPLICATION_HOSTGROUPS_V1_0); // issue #643
 	if (rci) {