[ENH] Add duration in Charge table

- Add 2 new columns duration (string + min) in Charge tab
- Data calculated on the fly to display in the table (No fields in DB)

psa_car_controller/psacc/application/charging.py

@@ -20,10 +20,10 @@ class Charging:
 
     @staticmethod
     def get_chargings() -> List[dict]:
-        conn = Database.get_db()
-        res = conn.execute("select * from battery ORDER BY start_at").fetchall()
-        conn.close()
-        return list(map(dict, res))
+        charge_db = Database.get_all_charge()
+        charge_list = list(map(dict, charge_db))
+        Charging._calculated_fields(charge_list)
+        return charge_list
 
     @staticmethod
     def get_battery_curve(conn, charge, car) -> List[BatteryChargeCurve]:
@@ -97,3 +97,15 @@ class Charging:
                 Charging.update_chargings(conn, last_charge, car)
         conn.commit()
         conn.close()
+
+    @staticmethod
+    def _calculated_fields(charge_list: list):
+        for c in charge_list:
+            if c.get("stop_at") and c.get("start_at"):
+                c.update(
+                    {
+                        "duration_min": (c.get("stop_at") - c.get("start_at")).seconds
+                        / 60,
+                        "duration_str": str((c.get("stop_at") - c.get("start_at"))),
+                    }
+                )

psa_car_controller/psacc/repository/db.py

@@ -321,6 +321,13 @@ class Database:
             charges.append(Charge(**dict_key_to_lower_case(**row)))
         return charges
 
+    @staticmethod
+    def get_all_charge() -> List[Charge]:
+        conn = Database.get_db()
+        res = conn.execute("select * from battery ORDER BY start_at").fetchall()
+        conn.close()      
+        return res
+    
     @staticmethod
     def update_charge(charge: Charge):
         # we don't need to update mileage, since it should be inserted at beginning of charge,

psa_car_controller/web/figures.py

@@ -139,6 +139,9 @@ def get_figures(car: Car):
         sort_by=[{'column_id': 'start_at_str', 'direction': 'desc'}],
         columns=[{'id': 'start_at_str', 'name': 'start at', 'type': 'datetime'},
                  {'id': 'stop_at_str', 'name': 'stop at', 'type': 'datetime'},
+                 {'id': 'duration_str', 'name': 'duration', 'type': 'text'},
+                 {'id': 'duration_min', 'name': 'duration (min)', 'type': 'numeric',
+                  'format': deepcopy(nb_format).symbol_suffix(" min").precision(0)},
                  {'id': 'start_level', 'name': 'start level', 'type': 'numeric'},
                  {'id': 'end_level', 'name': 'end level', 'type': 'numeric'},
                  {'id': 'co2', 'name': 'CO2', 'type': 'numeric',