codigo actual del servidor, con avances de joan

source_code/lib/data_model/chart_response.dart

@@ -0,0 +1,29 @@
+// To parse this JSON data, do
+//
+//     final chartResponse = chartResponseFromJson(jsonString);
+
+import 'dart:convert';
+
+List<ChartResponse> chartResponseFromJson(String str) => List<ChartResponse>.from(json.decode(str).map((x) => ChartResponse.fromJson(x)));
+
+String chartResponseToJson(List<ChartResponse> data) => json.encode(List<dynamic>.from(data.map((x) => x.toJson())));
+
+class ChartResponse {
+  ChartResponse({
+    this.total,
+    this.date,
+  });
+
+  double? total;
+  String? date;
+
+  factory ChartResponse.fromJson(Map<String, dynamic> json) => ChartResponse(
+    total: json["total"].toDouble(),
+    date: json["date"],
+  );
+
+  Map<String, dynamic> toJson() => {
+    "total": total,
+    "date": date,
+  };
+}