add timestamp to the export filename (#366)

backend/app/api/handlers/v1/v1_ctrl_items.go

@@ -4,10 +4,12 @@ import (
 	"database/sql"
 	"encoding/csv"
 	"errors"
+	"fmt"
 	"math/big"
 	"net/http"
 	"net/url"
 	"strings"
+	"time"
 
 	"github.com/google/uuid"
 	"github.com/hay-kot/httpkit/errchain"
@@ -339,9 +341,12 @@ func (ctrl *V1Controller) HandleItemsExport() errchain.HandlerFunc {
 			log.Err(err).Msg("failed to export items")
 			return validate.NewRequestError(err, http.StatusInternalServerError)
 		}
+		
+		timestamp := time.Now().Format("2006-01-02_15-04-05") // YYYY-MM-DD_HH-MM-SS format
+		filename := fmt.Sprintf("homebox-items_%s.csv", timestamp) // add timestamp to filename
 
 		w.Header().Set("Content-Type", "text/csv")
-		w.Header().Set("Content-Disposition", "attachment;filename=homebox-items.csv")
+		w.Header().Set("Content-Disposition", fmt.Sprintf("attachment;filename=%s", filename))
 
 		writer := csv.NewWriter(w)
 		writer.Comma = ','