add: macro endpoints

add: basic macro support
fix: database locking with lock-pointer
fix: memory leaks

src/endpoints/api_v1_controllers_STR.c

@@ -193,7 +193,8 @@ api_v1_controllers_STR_DELETE(struct mg_connection *nc, struct http_message *hm,
     else
     {
         LOGGER_DEBUG("deleted controller %s\n", args[0].value.v_str);
-        endpoint_response_text(response, 200, "", 0);
+        static const char content[] = "delete controller";
+        endpoint_response_text(response, 200, content, STRLEN(content));
     }
     controller_free(controller);
     return;