Return not found for more recently deleted servers, too

server/graph_image.go

@@ -8,6 +8,7 @@ import (
 	"net/http/httptrace"
 	"net/url"
 	"os"
+	"time"
 
 	"github.com/hashicorp/go-retryablehttp"
 	"github.com/labstack/echo/v4"
@@ -49,6 +50,9 @@ func (srv *Server) graphImage(c echo.Context) error {
 	if serverData.ID == 0 {
 		return c.String(http.StatusNotFound, "not found")
 	}
+	if serverData.DeletionAge(7 * 24 * time.Hour) {
+		return c.String(http.StatusNotFound, "not found")
+	}
 
 	if serverData.Ip != serverID {
 		return c.Redirect(308, fmt.Sprintf("/graph/%s/offset.png", serverData.Ip))