tie csv engine to meteo domain

service_a/internal/domains/meteo/handlers.go

@@ -12,10 +12,14 @@ import (
 	"time"
 )
 
-type Handler struct{}
+type Handler struct {
+	csv *CSV
+}
 
 func NewHandler() *Handler {
-	return &Handler{}
+	return &Handler{
+		csv: &CSV{},
+	}
 }
 
 func (h *Handler) IngestCSV(w http.ResponseWriter, r *http.Request) {
@@ -47,8 +51,7 @@ func (h *Handler) IngestCSV(w http.ResponseWriter, r *http.Request) {
 
 	start := time.Now()
 
-	csvParser := &CSV{}
-	inserted, rejected, err := csvParser.Parse(bytes.NewReader(content), fileStats)
+	inserted, rejected, err := h.csv.Parse(bytes.NewReader(content), fileStats)
 	if err != nil {
 		slog.Error(ErrCannotParseFile.Error(),
 			"filename", header.Filename,