diff --git a/Dockerfile b/Dockerfile
index bf0126d..28b058e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 
 RUN apk --no-cache upgrade
 RUN apk --no-cache add ca-certificates tzdata zsh jq tmux curl
diff --git a/go.mod b/go.mod
index 99904cf..1ac2b09 100644
--- a/go.mod
+++ b/go.mod
@@ -16,7 +16,7 @@ require (
 	github.com/spf13/cobra v1.8.1
 	github.com/stretchr/testify v1.10.0
 	go.ntppool.org/api v0.3.4
-	go.ntppool.org/common v0.3.0
+	go.ntppool.org/common v0.3.1
 	go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho v0.58.0
 	go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace v0.58.0
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.58.0
diff --git a/go.sum b/go.sum
index 4b7d494..1ae9379 100644
--- a/go.sum
+++ b/go.sum
@@ -140,6 +140,8 @@ go.ntppool.org/api v0.3.4 h1:KeRyFhIRkjJwZif7hkpqEDEBmukyYGiOi2Fd6j3UzQ0=
 go.ntppool.org/api v0.3.4/go.mod h1:LFLAwnrc/JyjzKnjgf8tCOJhps6oFIjuledS3PCx7xc=
 go.ntppool.org/common v0.3.0 h1:IuSmyjEhI1F3tr5kc5MqlR4cy5y0o5f3EKvC7Koc6rs=
 go.ntppool.org/common v0.3.0/go.mod h1:25pUt3YUusF1MY0nsljjskcMMeTvKZszVvNsubvWhSM=
+go.ntppool.org/common v0.3.1 h1:JaJpS3m8oAc9jH0yhHYJnjOC+RUzxx/F+EDe0QON4eQ=
+go.ntppool.org/common v0.3.1/go.mod h1:1SKjFBH9AL7Fj2S0zy41isHzV6dTC+6yIKD5QDtX8aY=
 go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
 go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
 go.opentelemetry.io/contrib/bridges/otelslog v0.8.0 h1:G3sKsNueSdxuACINFxKrQeimAIst0A5ytA2YJH+3e1c=
diff --git a/server/history.go b/server/history.go
index b09bc2c..67c7c5b 100644
--- a/server/history.go
+++ b/server/history.go
@@ -73,7 +73,7 @@ func (srv *Server) getHistoryParameters(ctx context.Context, c echo.Context) (hi
 
 	monitorParam := c.QueryParam("monitor")
 
-	var monitorID uint32 = 0
+	var monitorID uint32
 	switch monitorParam {
 	case "":
 		name := "recentmedian.scores.ntp.dev"
@@ -223,7 +223,6 @@ func (srv *Server) history(c echo.Context) error {
 	default:
 		return c.String(http.StatusNotFound, "not implemented")
 	}
-
 }
 
 func (srv *Server) historyJSON(ctx context.Context, c echo.Context, server ntpdb.Server, history *logscores.LogScoreHistory) error {
@@ -326,12 +325,13 @@ func (srv *Server) historyJSON(ctx context.Context, c echo.Context, server ntpdb
 	}
 
 	return c.JSON(http.StatusOK, res)
-
 }
 
 func (srv *Server) historyCSV(ctx context.Context, c echo.Context, history *logscores.LogScoreHistory) error {
 	log := logger.Setup()
 	ctx, span := tracing.Tracer().Start(ctx, "history.csv")
+	defer span.End()
+
 	b := bytes.NewBuffer([]byte{})
 	w := csv.NewWriter(b)
 
@@ -342,7 +342,11 @@ func (srv *Server) historyCSV(ctx context.Context, c echo.Context, history *logs
 		return s
 	}
 
-	w.Write([]string{"ts_epoch", "ts", "offset", "step", "score", "monitor_id", "monitor_name", "leap", "error"})
+	err := w.Write([]string{"ts_epoch", "ts", "offset", "step", "score", "monitor_id", "monitor_name", "leap", "error"})
+	if err != nil {
+		log.ErrorContext(ctx, "could not write csv header", "err", err)
+		return err
+	}
 	for _, l := range history.LogScores {
 		// log.Debug("csv line", "id", l.ID, "n", i)
 
@@ -381,7 +385,6 @@ func (srv *Server) historyCSV(ctx context.Context, c echo.Context, history *logs
 	w.Flush()
 	if err := w.Error(); err != nil {
 		log.ErrorContext(ctx, "could not flush csv", "err", err)
-		span.End()
 		return c.String(http.StatusInternalServerError, "csv error")
 	}
 
@@ -392,5 +395,4 @@ func (srv *Server) historyCSV(ctx context.Context, c echo.Context, history *logs
 	// Chrome and Firefox force-download text/csv files, so use text/plain
 	// https://bugs.chromium.org/p/chromium/issues/detail?id=152911
 	return c.Blob(http.StatusOK, "text/plain", b.Bytes())
-
 }
diff --git a/server/server.go b/server/server.go
index 54ec0b7..c50ab13 100644
--- a/server/server.go
+++ b/server/server.go
@@ -76,7 +76,7 @@ func NewServer(ctx context.Context, configFile string) (*Server, error) {
 		Environment: conf.DeploymentMode(),
 	})
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("tracing init: %w", err)
 	}
 
 	srv.tpShutdown = append(srv.tpShutdown, tpShutdown)
@@ -274,13 +274,10 @@ func (srv *Server) userCountryData(c echo.Context) error {
 		UserCountry: data,
 		ZoneStats:   zoneStats,
 	})
-
 }
 
 func healthHandler(srv *Server, log *slog.Logger) func(w http.ResponseWriter, req *http.Request) {
-
 	return func(w http.ResponseWriter, req *http.Request) {
-
 		ctx := req.Context()
 		ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
 		defer cancel()
@@ -319,10 +316,16 @@ func healthHandler(srv *Server, log *slog.Logger) func(w http.ResponseWriter, re
 		err = g.Wait()
 		if err != nil {
 			w.WriteHeader(http.StatusServiceUnavailable)
-			w.Write([]byte("db ping err"))
+			_, err = w.Write([]byte("db ping err"))
+			if err != nil {
+				log.ErrorContext(ctx, "could not write response", "err", err)
+			}
 			return
 		}
 		w.WriteHeader(http.StatusOK)
-		w.Write([]byte("ok"))
+		_, err = w.Write([]byte("ok"))
+		if err != nil {
+			log.ErrorContext(ctx, "could not write response", "err", err)
+		}
 	}
 }