feat: add endpoint and logic for retrieving transaction chart data, including SQL queries, models, and service integration

internal/models/dashboard_model.go

@@ -52,3 +52,19 @@ type AnomalyItem struct {
 	ComponentName string    `json:"componentName"`
 	ComponentUnit string    `json:"componentUnit"`
 }
+
+type TransactionChartRow struct {
+	Date            time.Time
+	TransactionType string
+	TotalQuantity   int64
+}
+
+type TransactionChartItem struct {
+	Date           string `json:"date"`
+	ImportQuantity int64  `json:"importQuantity"`
+	ExportQuantity int64  `json:"exportQuantity"`
+}
+
+type TransactionChartData struct {
+	Items []TransactionChartItem `json:"items"`
+}