diff --git a/api/gql_ev/resolver.go b/api/gql_ev/resolver.go
index e9260de..af3b886 100644
--- a/api/gql_ev/resolver.go
+++ b/api/gql_ev/resolver.go
@@ -3,6 +3,7 @@ package gql_ev
 import (
 	"context"
 	"crypto/sha256"
+	"errors"
 	"fmt"
 	"strings"
 	"time"
@@ -19,31 +20,40 @@ import (
 type Resolver struct {
 	es *es.EventStore
 
-	Mresolver_posts            syncint64.Counter
-	Mresolver_post_added       syncint64.Counter
-	Mresolver_post_added_event syncint64.Counter
+	Mresolver_posts             syncint64.Counter
+	Mresolver_post_added        syncint64.Counter
+	Mresolver_post_added_event  syncint64.Counter
+	Mresolver_create_salty_user syncint64.Counter
+	Mresolver_salty_user        syncint64.Counter
 }
 
-func New(es *es.EventStore) (*Resolver, error) {
-	m := logz.Meter(context.Background())
+func New(ctx context.Context, es *es.EventStore) (*Resolver, error) {
+	ctx, span := logz.Span(ctx)
+	defer span.End()
 
-	var errs error
+	m := logz.Meter(ctx)
 
-	Mresolver_posts, err := m.SyncInt64().Counter("resolver_posts")
+	var err, errs error
+
+	r := &Resolver{es: es}
+
+	r.Mresolver_posts, err = m.SyncInt64().Counter("resolver_posts")
 	errs = multierr.Append(errs, err)
 
-	Mresolver_post_added, err := m.SyncInt64().Counter("resolver_post_added")
+	r.Mresolver_post_added, err = m.SyncInt64().Counter("resolver_post_added")
 	errs = multierr.Append(errs, err)
 
-	Mresolver_post_added_event, err := m.SyncInt64().Counter("resolver_post_added")
+	r.Mresolver_post_added_event, err = m.SyncInt64().Counter("resolver_post_added")
 	errs = multierr.Append(errs, err)
 
-	return &Resolver{
-		es,
-		Mresolver_posts,
-		Mresolver_post_added,
-		Mresolver_post_added_event,
-	}, errs
+	r.Mresolver_create_salty_user, err = m.SyncInt64().Counter("resolver_create_salty_user")
+	errs = multierr.Append(errs, err)
+
+	r.Mresolver_salty_user, err = m.SyncInt64().Counter("resolver_salty_user")
+	errs = multierr.Append(errs, err)
+
+	span.RecordError(err)
+	return r, errs
 }
 
 // Posts is the resolver for the events field.
@@ -55,6 +65,7 @@ func (r *Resolver) Posts(ctx context.Context, streamID string, paging *PageInput
 
 	lis, err := r.es.Read(ctx, streamID, paging.GetIdx(0), paging.GetCount(30))
 	if err != nil {
+		span.RecordError(err)
 		return nil, err
 	}
 
@@ -79,9 +90,11 @@ func (r *Resolver) Posts(ctx context.Context, streamID string, paging *PageInput
 
 	var first, last uint64
 	if first, err = r.es.FirstIndex(ctx, streamID); err != nil {
+		span.RecordError(err)
 		return nil, err
 	}
 	if last, err = r.es.LastIndex(ctx, streamID); err != nil {
+		span.RecordError(err)
 		return nil, err
 	}
 
@@ -109,23 +122,30 @@ func (r *Resolver) PostAdded(ctx context.Context, streamID string, after int64)
 
 	sub, err := es.Subscribe(ctx, streamID, after)
 	if err != nil {
+		span.RecordError(err)
 		return nil, err
 	}
 
 	ch := make(chan *PostEvent)
 
 	go func() {
+		ctx, span := logz.Span(ctx)
+		defer span.End()
+
 		defer func() {
 			ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
 			defer cancel()
-			sub.Close(ctx)
+			err := sub.Close(ctx)
+			span.RecordError(err)
 		}()
 
 		for sub.Recv(ctx) {
 			events, err := sub.Events(ctx)
 			if err != nil {
+				span.RecordError(err)
 				break
 			}
+			span.AddEvent(fmt.Sprintf("received %d events", len(events)))
 			r.Mresolver_post_added_event.Add(ctx, int64(len(events)))
 
 			for _, e := range events {
@@ -151,33 +171,58 @@ func (r *Resolver) PostAdded(ctx context.Context, streamID string, after int64)
 }
 
 func (r *Resolver) CreateSaltyUser(ctx context.Context, nick string, pub string) (*SaltyUser, error) {
+	ctx, span := logz.Span(ctx)
+	defer span.End()
+
+	r.Mresolver_create_salty_user.Add(ctx, 1)
+
 	streamID := fmt.Sprintf("saltyuser-%x", sha256.Sum256([]byte(strings.ToLower(nick))))
+	span.AddEvent(streamID)
 
 	key, err := keys.NewEdX25519PublicKeyFromID(keys.ID(pub))
 	if err != nil {
+		span.RecordError(err)
 		return nil, err
 	}
 
 	a, err := es.Create(ctx, r.es, streamID, func(ctx context.Context, agg *domain.SaltyUser) error {
 		return agg.OnUserRegister(nick, key)
 	})
-	if err != nil {
-		return nil, err
+	switch {
+	case errors.Is(err, es.ErrShouldNotExist):
+		span.RecordError(err)
+		return nil, fmt.Errorf("user exists")
+
+	case err != nil:
+		span.RecordError(err)
+		return nil, fmt.Errorf("internal error")
 	}
 
 	return &SaltyUser{
 		Nick:   nick,
 		Pubkey: pub,
 		Inbox:  a.Inbox.String(),
-	}, err
+	}, nil
 }
 
 func (r *Resolver) SaltyUser(ctx context.Context, nick string) (*SaltyUser, error) {
+	ctx, span := logz.Span(ctx)
+	defer span.End()
+
+	r.Mresolver_salty_user.Add(ctx, 1)
+
 	streamID := fmt.Sprintf("saltyuser-%x", sha256.Sum256([]byte(strings.ToLower(nick))))
+	span.AddEvent(streamID)
 
 	a, err := es.Update(ctx, r.es, streamID, func(ctx context.Context, agg *domain.SaltyUser) error { return nil })
-	if err != nil {
-		return nil, err
+	switch {
+	case errors.Is(err, es.ErrShouldExist):
+		span.RecordError(err)
+		return nil, fmt.Errorf("user not found")
+
+	case err != nil:
+		span.RecordError(err)
+		return nil, fmt.Errorf("%w internal error", err)
 	}
 
 	return &SaltyUser{
diff --git a/main.go b/main.go
index 9efd86d..52c4fc2 100644
--- a/main.go
+++ b/main.go
@@ -49,58 +49,68 @@ func main() {
 	}
 }
 func run(ctx context.Context) error {
-	ctx, span := logz.Span(ctx)
-	diskstore.Init(ctx)
-	memstore.Init(ctx)
-	if err := domain.Init(ctx); err != nil {
-		return err
-	}
-
-	es, err := es.Open(ctx, env("EV_DATA", "file:data"), streamer.New(ctx))
-	if err != nil {
-		return err
-	}
-
-	svc, err := msgbus.New(ctx, es, env("EV_BASE_URL", "https://ev.sour.is/inbox/"))
-	if err != nil {
-		return err
-	}
-
-	r, err := gql_ev.New(es)
-	if err != nil {
-		return err
-	}
-	res := graph.New(r)
-	gql := handler.NewDefaultServer(generated.NewExecutableSchema(generated.Config{Resolvers: res}))
-	gql.Use(otelgqlgen.Middleware())
-
-	s := http.Server{
-		Addr: env("EV_HTTP", ":8080"),
-	}
-	mux := http.NewServeMux()
-
-	mux.Handle("/", playground.Handler("GraphQL playground", "/gql"))
-	mux.Handle("/gql", logz.Htrace(res.ChainMiddlewares(gql), "gql"))
-	mux.Handle("/inbox/", logz.Htrace(http.StripPrefix("/inbox/", svc), "inbox"))
-	mux.Handle("/.well-known/salty/", logz.Htrace(svc, "lookup"))
-	mux.Handle("/metrics", logz.PromHTTP(ctx))
-
-	s.Handler = cors.AllowAll().Handler(mux)
-
-	log.Print("Listen on ", s.Addr)
 	g, ctx := errgroup.WithContext(ctx)
 
-	g.Go(s.ListenAndServe)
+	{
+		ctx, span := logz.Span(ctx)
 
-	g.Go(func() error {
-		<-ctx.Done()
-		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-		defer cancel()
-		return s.Shutdown(ctx)
-	})
+		diskstore.Init(ctx)
+		memstore.Init(ctx)
+		if err := domain.Init(ctx); err != nil {
+			span.RecordError(err)
+			return err
+		}
 
-	span.End()
+		es, err := es.Open(ctx, env("EV_DATA", "file:data"), streamer.New(ctx))
+		if err != nil {
+			span.RecordError(err)
+			return err
+		}
 
+		svc, err := msgbus.New(ctx, es, env("EV_BASE_URL", "https://ev.sour.is/inbox/"))
+		if err != nil {
+			span.RecordError(err)
+			return err
+		}
+
+		r, err := gql_ev.New(ctx, es)
+		if err != nil {
+			span.RecordError(err)
+			return err
+		}
+		res := graph.New(r)
+		gql := handler.NewDefaultServer(generated.NewExecutableSchema(generated.Config{Resolvers: res}))
+		gql.Use(otelgqlgen.Middleware())
+
+		s := http.Server{
+			Addr: env("EV_HTTP", ":8080"),
+		}
+
+		mux := http.NewServeMux()
+
+		mux.Handle("/", playground.Handler("GraphQL playground", "/gql"))
+		mux.Handle("/gql", logz.Htrace(res.ChainMiddlewares(gql), "gql"))
+		mux.Handle("/metrics", logz.PromHTTP(ctx))
+
+		mux.Handle("/inbox/", logz.Htrace(http.StripPrefix("/inbox/", svc), "inbox"))
+		mux.Handle("/.well-known/salty/", logz.Htrace(svc, "lookup"))
+
+		s.Handler = cors.AllowAll().Handler(mux)
+
+		log.Print("Listen on ", s.Addr)
+		span.AddEvent("begin listen and serve")
+
+		g.Go(s.ListenAndServe)
+
+		g.Go(func() error {
+			<-ctx.Done()
+			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+			defer cancel()
+			return s.Shutdown(ctx)
+		})
+
+		span.End()
+	}
 	return g.Wait()
 }
 func env(name, defaultValue string) string {
diff --git a/pkg/es/driver/disk-store/disk-store.go b/pkg/es/driver/disk-store/disk-store.go
index 04657e1..d61bb83 100644
--- a/pkg/es/driver/disk-store/disk-store.go
+++ b/pkg/es/driver/disk-store/disk-store.go
@@ -111,13 +111,13 @@ func (d *diskStore) Open(ctx context.Context, dsn string) (driver.Driver, error)
 		Mdisk_evict: d.Mdisk_evict,
 	}, nil
 }
-func (ds *diskStore) EventLog(ctx context.Context, streamID string) (driver.EventLog, error) {
+func (d *diskStore) EventLog(ctx context.Context, streamID string) (driver.EventLog, error) {
 	_, span := logz.Span(ctx)
 	defer span.End()
 
 	el := &eventLog{streamID: streamID}
 
-	return el, ds.openlogs.Modify(ctx, func(openlogs *openlogs) error {
+	return el, d.openlogs.Modify(ctx, func(openlogs *openlogs) error {
 		_, span := logz.Span(ctx)
 		defer span.End()
 
@@ -126,7 +126,7 @@ func (ds *diskStore) EventLog(ctx context.Context, streamID string) (driver.Even
 			return nil
 		}
 
-		l, err := wal.Open(filepath.Join(ds.path, streamID), wal.DefaultOptions)
+		l, err := wal.Open(filepath.Join(d.path, streamID), wal.DefaultOptions)
 		if err != nil {
 			span.RecordError(err)
 			return err
@@ -144,14 +144,14 @@ type eventLog struct {
 
 var _ driver.EventLog = (*eventLog)(nil)
 
-func (es *eventLog) Append(ctx context.Context, events event.Events, version uint64) (uint64, error) {
+func (e *eventLog) Append(ctx context.Context, events event.Events, version uint64) (uint64, error) {
 	_, span := logz.Span(ctx)
 	defer span.End()
 
-	event.SetStreamID(es.streamID, events...)
+	event.SetStreamID(e.streamID, events...)
 
 	var count uint64
-	err := es.events.Modify(ctx, func(l *wal.Log) error {
+	err := e.events.Modify(ctx, func(l *wal.Log) error {
 		_, span := logz.Span(ctx)
 		defer span.End()
 
@@ -162,7 +162,7 @@ func (es *eventLog) Append(ctx context.Context, events event.Events, version uin
 		}
 
 		if version != AppendOnly && version != last {
-			return fmt.Errorf("current version wrong %d != %d", version, last)
+			return fmt.Errorf("%w: current version wrong %d != %d", es.ErrWrongVersion, version, last)
 		}
 
 		var b []byte
@@ -189,13 +189,13 @@ func (es *eventLog) Append(ctx context.Context, events event.Events, version uin
 
 	return count, err
 }
-func (es *eventLog) Read(ctx context.Context, pos, count int64) (event.Events, error) {
+func (e *eventLog) Read(ctx context.Context, pos, count int64) (event.Events, error) {
 	_, span := logz.Span(ctx)
 	defer span.End()
 
 	var events event.Events
 
-	err := es.events.Modify(ctx, func(stream *wal.Log) error {
+	err := e.events.Modify(ctx, func(stream *wal.Log) error {
 		_, span := logz.Span(ctx)
 		defer span.End()
 
@@ -255,38 +255,38 @@ func (es *eventLog) Read(ctx context.Context, pos, count int64) (event.Events, e
 		return nil, err
 	}
 
-	event.SetStreamID(es.streamID, events...)
+	event.SetStreamID(e.streamID, events...)
 
 	return events, nil
 }
-func (es *eventLog) FirstIndex(ctx context.Context) (uint64, error) {
+func (e *eventLog) FirstIndex(ctx context.Context) (uint64, error) {
 	_, span := logz.Span(ctx)
 	defer span.End()
 
 	var idx uint64
 	var err error
 
-	err = es.events.Modify(ctx, func(events *wal.Log) error {
+	err = e.events.Modify(ctx, func(events *wal.Log) error {
 		idx, err = events.FirstIndex()
 		return err
 	})
 
 	return idx, err
 }
-func (es *eventLog) LastIndex(ctx context.Context) (uint64, error) {
+func (e *eventLog) LastIndex(ctx context.Context) (uint64, error) {
 	_, span := logz.Span(ctx)
 	defer span.End()
 
 	var idx uint64
 	var err error
 
-	err = es.events.Modify(ctx, func(events *wal.Log) error {
+	err = e.events.Modify(ctx, func(events *wal.Log) error {
 		idx, err = events.LastIndex()
 		return err
 	})
 
 	return idx, err
 }
-func (es *eventLog) LoadForUpdate(ctx context.Context, a event.Aggregate, fn func(context.Context, event.Aggregate) error) (uint64, error) {
+func (e *eventLog) LoadForUpdate(ctx context.Context, a event.Aggregate, fn func(context.Context, event.Aggregate) error) (uint64, error) {
 	panic("not implemented")
 }
diff --git a/pkg/es/driver/mem-store/mem-store.go b/pkg/es/driver/mem-store/mem-store.go
index ddec1c9..70f4a72 100644
--- a/pkg/es/driver/mem-store/mem-store.go
+++ b/pkg/es/driver/mem-store/mem-store.go
@@ -83,7 +83,7 @@ func (m *eventLog) Append(ctx context.Context, events event.Events, version uint
 
 		last := uint64(len(*stream))
 		if version != AppendOnly && version != last {
-			return fmt.Errorf("current version wrong %d != %d", version, last)
+			return fmt.Errorf("%w: current version wrong %d != %d", es.ErrWrongVersion, version, last)
 		}
 
 		for i := range events {
diff --git a/pkg/es/es.go b/pkg/es/es.go
index 639b935..35ae4db 100644
--- a/pkg/es/es.go
+++ b/pkg/es/es.go
@@ -216,6 +216,9 @@ func Unwrap[T any](t T) T {
 }
 
 var ErrNoDriver = errors.New("no driver")
+var ErrWrongVersion = errors.New("wrong version")
+var ErrShouldExist = event.ErrShouldExist
+var ErrShouldNotExist = event.ErrShouldNotExist
 
 type PA[T any] interface {
 	event.Aggregate