diff --git a/adding.go b/adding.go
index 7b28876..6801b10 100644
--- a/adding.go
+++ b/adding.go
@@ -28,7 +28,7 @@ func (rl *Relay) AddEvent(ctx context.Context, evt *nostr.Event) (skipBroadcast
 		}
 	}
 
-	if 20000 <= evt.Kind && evt.Kind < 30000 {
+	if nostr.IsEphemeralKind(evt.Kind) {
 		// do not store ephemeral events
 		for _, oee := range rl.OnEphemeralEvent {
 			oee(ctx, evt)
diff --git a/examples/basic-lmdb/main.go b/examples/basic-lmdb/main.go
index 03d938b..203d318 100644
--- a/examples/basic-lmdb/main.go
+++ b/examples/basic-lmdb/main.go
@@ -13,7 +13,7 @@ func main() {
 	relay := khatru.NewRelay()
 
 	db := lmdb.LMDBBackend{Path: "/tmp/khatru-lmdb-tmp"}
-	os.MkdirAll(db.Path, 0755)
+	os.MkdirAll(db.Path, 0o755)
 	if err := db.Init(); err != nil {
 		panic(err)
 	}
diff --git a/examples/exclusive/main.go b/examples/exclusive/main.go
index 1773686..ab82da6 100644
--- a/examples/exclusive/main.go
+++ b/examples/exclusive/main.go
@@ -16,7 +16,7 @@ func main() {
 	relay := khatru.NewRelay()
 
 	db := lmdb.LMDBBackend{Path: "/tmp/exclusive"}
-	os.MkdirAll(db.Path, 0755)
+	os.MkdirAll(db.Path, 0o755)
 	if err := db.Init(); err != nil {
 		panic(err)
 	}
diff --git a/policies/nip04.go b/policies/nip04.go
index 087746d..d97f767 100644
--- a/policies/nip04.go
+++ b/policies/nip04.go
@@ -2,7 +2,6 @@ package policies
 
 import (
 	"context"
-
 	"slices"
 
 	"github.com/fiatjaf/khatru"