diff --git a/eventstore/boltdb/replace.go b/eventstore/boltdb/replace.go
index f488ba3..2f3588b 100644
--- a/eventstore/boltdb/replace.go
+++ b/eventstore/boltdb/replace.go
@@ -11,6 +11,14 @@ import (
 
 func (b *BoltBackend) ReplaceEvent(evt nostr.Event) error {
 	return b.DB.Update(func(txn *bbolt.Tx) error {
+		rawBucket := txn.Bucket(rawEventStore)
+
+		// check if we already have this id
+		bin := rawBucket.Get(evt.ID[16:24])
+		if bin != nil {
+			return nil
+		}
+
 		filter := nostr.Filter{Kinds: []nostr.Kind{evt.Kind}, Authors: []nostr.PubKey{evt.PubKey}}
 		if evt.Kind.IsAddressable() {
 			// when addressable, add the "d" tag to the filter
diff --git a/eventstore/lmdb/replace.go b/eventstore/lmdb/replace.go
index abb722f..4931540 100644
--- a/eventstore/lmdb/replace.go
+++ b/eventstore/lmdb/replace.go
@@ -11,6 +11,15 @@ import (
 
 func (b *LMDBBackend) ReplaceEvent(evt nostr.Event) error {
 	return b.lmdbEnv.Update(func(txn *lmdb.Txn) error {
+		// check if we already have this id
+		_, existsErr := txn.Get(b.indexId, evt.ID[0:8])
+		if existsErr == nil {
+			return nil
+		}
+		if operr, ok := existsErr.(*lmdb.OpError); !ok || operr.Errno != lmdb.NotFound {
+			return existsErr
+		}
+
 		filter := nostr.Filter{Kinds: []nostr.Kind{evt.Kind}, Authors: []nostr.PubKey{evt.PubKey}}
 		if evt.Kind.IsAddressable() {
 			// when addressable, add the "d" tag to the filter
diff --git a/eventstore/mmm/replace.go b/eventstore/mmm/replace.go
index 079b84e..46cc8a9 100644
--- a/eventstore/mmm/replace.go
+++ b/eventstore/mmm/replace.go
@@ -7,6 +7,7 @@ import (
 
 	"fiatjaf.com/nostr"
 	"fiatjaf.com/nostr/eventstore/internal"
+	"github.com/PowerDNS/lmdb-go/lmdb"
 )
 
 func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) error {
@@ -47,6 +48,15 @@ func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) error {
 	}()
 	iltxn.RawRead = true
 
+	// check if we already have this id
+	_, existsErr := mmmtxn.Get(il.mmmm.indexId, evt.ID[0:8])
+	if existsErr == nil {
+		return nil
+	}
+	if !lmdb.IsNotFound(existsErr) {
+		return fmt.Errorf("error checking existence: %w", existsErr)
+	}
+
 	// now we fetch the past events, whatever they are, delete them and then save the new
 	var results iter.Seq[nostr.Event] = func(yield func(nostr.Event) bool) {
 		err = il.query(iltxn, filter, 10 /* in theory limit could be just 1 and this should work */, yield)