park time can be saved to db now

headers/Park_time.h

@@ -0,0 +1,51 @@
+#ifndef PARK_TIME_H
+#define PARK_TIME_H
+#pragma once
+
+#include <chrono>
+#include <iostream>
+#include <string>
+#include "data.h"
+
+
+using namespace std::chrono;
+using std::string;
+using std::to_string;
+/*
+db repr of Park_time
+int id (not null, auto increment)
+int customer_id (not null) (many to one or something like that)
+int spot_id (not null, many to one or something like that)
+int duration 
+datetime start (not null)
+datetime end
+
+Dit is gewoon een record van hoe lang, wie en waar iemand parkeert. Basically, een component van 
+de internal state van customer.
+*/
+
+class Park_time {
+public:
+    int id;
+    int customer_id;
+    int spot_id;
+    int duration;
+    Park_time(int c_id, int s_id);
+    // Park_time(int c_id, int s_id );
+    void clock_out(int c_id, int s_id);
+    friend std::ostream& operator<<(std::ostream& os, const  Park_time & pt);
+
+private:
+    high_resolution_clock::time_point start;
+    high_resolution_clock::time_point end;
+    void save_db();
+    void update_db();
+    int auto_increment_db(); // helper
+    int start_to_int(); // helper
+    
+};
+
+
+
+
+#endif // Park_time