diff --git a/basic/query.go b/basic/query.go
index cb3f364..85f01cd 100644
--- a/basic/query.go
+++ b/basic/query.go
@@ -15,7 +15,7 @@ import (
 
 func (b *BasicRelay) QueryEvents(filter *nostr.Filter) (events []nostr.Event, err error) {
 	var conditions []string
-	var params []interface{}
+	var params []any
 
 	if filter == nil {
 		err = errors.New("filter cannot be null")
diff --git a/basic/save.go b/basic/save.go
index 042c85d..0c9b4ee 100644
--- a/basic/save.go
+++ b/basic/save.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"strings"
+	"time"
 
 	"github.com/fiatjaf/go-nostr"
 )
@@ -16,22 +17,18 @@ func (b *BasicRelay) SaveEvent(evt *nostr.Event) error {
 	}
 
 	// react to different kinds of events
-	switch evt.Kind {
-	case nostr.KindSetMetadata:
-		// delete past set_metadata events from this user
-		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = 0`, evt.PubKey)
-	case nostr.KindRecommendServer:
+	if evt.Kind == nostr.KindSetMetadata || evt.Kind == nostr.KindContactList || (10000 <= evt.Kind && evt.Kind < 20000) {
+		// delete past events from this user
+		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2`, evt.PubKey, evt.Kind)
+	} else if evt.Kind == nostr.KindRecommendServer {
 		// delete past recommend_server events equal to this one
-		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = 2 AND content = $2`,
-			evt.PubKey, evt.Content)
-	case nostr.KindContactList:
-		// delete past contact lists from this same pubkey
-		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = 3`, evt.PubKey)
-	default:
-		// delete all but the 10 most recent ones
+		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND content = $3`,
+			evt.PubKey, evt.Kind, evt.Content)
+	} else {
+		// delete all but the 100 most recent ones
 		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND created_at < (
           SELECT created_at FROM event WHERE pubkey = $1
-          ORDER BY created_at DESC OFFSET 10 LIMIT 1
+          ORDER BY created_at DESC OFFSET 100 LIMIT 1
         )`,
 			evt.PubKey, evt.Kind)
 	}
@@ -51,5 +48,11 @@ func (b *BasicRelay) SaveEvent(evt *nostr.Event) error {
 		return fmt.Errorf("failed to save event %s: %w", evt.ID, err)
 	}
 
+	// delete ephemeral events after a minute
+	go func() {
+		time.Sleep(75 * time.Second)
+		b.DB.Exec("DELETE FROM event WHERE id = $1", evt.ID)
+	}()
+
 	return nil
 }
diff --git a/closedrelay/query.go b/closedrelay/query.go
index 3deb776..e77cf8d 100644
--- a/closedrelay/query.go
+++ b/closedrelay/query.go
@@ -15,7 +15,7 @@ import (
 
 func (b *ClosedRelay) QueryEvents(filter *nostr.Filter) (events []nostr.Event, err error) {
 	var conditions []string
-	var params []interface{}
+	var params []any
 
 	if filter == nil {
 		err = errors.New("filter cannot be null")
diff --git a/closedrelay/save.go b/closedrelay/save.go
index bd61d47..bfd8a7f 100644
--- a/closedrelay/save.go
+++ b/closedrelay/save.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"strings"
+	"time"
 
 	"github.com/fiatjaf/go-nostr"
 )
@@ -19,24 +20,15 @@ func (b *ClosedRelay) SaveEvent(evt *nostr.Event) error {
 
 save:
 	// react to different kinds of events
-	switch evt.Kind {
-	case nostr.KindSetMetadata:
-		// delete past set_metadata events from this user
-		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = 0`, evt.PubKey)
-	case nostr.KindRecommendServer:
+	if evt.Kind == nostr.KindSetMetadata || evt.Kind == nostr.KindContactList || (10000 <= evt.Kind && evt.Kind < 20000) {
+		// delete past events from this user
+		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2`, evt.PubKey, evt.Kind)
+	} else if evt.Kind == nostr.KindRecommendServer {
 		// delete past recommend_server events equal to this one
-		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = 2 AND content = $2`,
-			evt.PubKey, evt.Content)
-	case nostr.KindContactList:
-		// delete past contact lists from this same pubkey
-		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = 3`, evt.PubKey)
-	default:
-		// delete all but the 10 most recent ones
-		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND created_at < (
-          SELECT created_at FROM event WHERE pubkey = $1
-          ORDER BY created_at DESC OFFSET 10 LIMIT 1
-        )`,
-			evt.PubKey, evt.Kind)
+		b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND content = $3`,
+			evt.PubKey, evt.Kind, evt.Content)
+	} else {
+		// do not delete any, this is a closed relay so we trust everybody to not spam
 	}
 
 	// insert
@@ -54,5 +46,11 @@ save:
 		return fmt.Errorf("failed to save event %s: %w", evt.ID, err)
 	}
 
+	// delete ephemeral events after a minute
+	go func() {
+		time.Sleep(75 * time.Second)
+		b.DB.Exec("DELETE FROM event WHERE id = $1", evt.ID)
+	}()
+
 	return nil
 }
diff --git a/go.mod b/go.mod
index b2413cf..bf52b84 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/fiatjaf/relayer
 
-go 1.15
+go 1.18
 
 require (
 	github.com/fiatjaf/go-nostr v0.7.3
@@ -12,3 +12,11 @@ require (
 	github.com/rs/cors v1.7.0
 	github.com/rs/zerolog v1.20.0
 )
+
+require (
+	github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
+	github.com/btcsuite/btcd/chaincfg/chainhash v1.0.1 // indirect
+	github.com/decred/dcrd/crypto/blake256 v1.0.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
+	github.com/valyala/fastjson v1.6.3 // indirect
+)
diff --git a/go.sum b/go.sum
index 4956c1f..0e80f3e 100644
--- a/go.sum
+++ b/go.sum
@@ -2,7 +2,6 @@ github.com/FactomProject/basen v0.0.0-20150613233007-fe3947df716e/go.mod h1:kGUq
 github.com/FactomProject/btcutilecc v0.0.0-20130527213604-d3a63a5752ec/go.mod h1:CD8UlnlLDiqb36L110uqiP2iSflVjx9g/3U9hCI4q2U=
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
 github.com/btcsuite/btcd v0.20.1-beta/go.mod h1:wVuoA8VJLEcwgqHBwHmzLRazpKxTv13Px/pDuV7OomQ=
-github.com/btcsuite/btcd v0.22.1 h1:CnwP9LM/M9xuRrGSCGeMVs9iv09uMqwsVX7EeIpgV2c=
 github.com/btcsuite/btcd v0.22.1/go.mod h1:wqgTSL29+50LRkmOVknEdmt8ZojIzhuWvgu/iptuN7Y=
 github.com/btcsuite/btcd/btcec/v2 v2.2.0 h1:fzn1qaOt32TuLjFlkzYSsBC35Q3KUjT1SwPxiMSCF5k=
 github.com/btcsuite/btcd/btcec/v2 v2.2.0/go.mod h1:U7MHm051Al6XmscBQ0BoNydpOTsFAn707034b5nY8zU=