Fixed historical bug

dataset.hpp

@@ -84,9 +84,9 @@ struct subsystem {
         //int num_fields = mysql_num_fields(r);
         MYSQL_ROW row;
         while((row=mysql_fetch_row(r))){
-          json_val["timestamp"]=row[0];
+          json_val["timestamp"]=std::stol(row[0]);
           json_val["value"]=row[1];
-          json_re["value"] += json_val;
+          json_re.push_back(json_val);
         }
         mysql_close(c);
       }

gm_telemetry_server.cpp

@@ -347,8 +347,8 @@ class telemetry_server {
 				//remove whitespace
 				val.erase(remove_if(val.begin(),val.end(),isspace),val.end());
 				nlohmann::json re;
-				re["type"] = "history";
 				re["id"] = val;
+				re["type"] = "history";
 				re["value"] = systemdata.getHistory(val);
 				return re;
 			}