eventstore: skip replacing when it's the exact same id.

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)