sdk: replace replaceables instead of saving.

sdk/list.go

@@ -94,7 +94,7 @@ func fetchGenericList[V comparable, I TagItemWithValue[V]](
 		// we'll only save this if we got something which means we found at least one event
 		lastFetchKey := makeLastFetchKey(actualKind, pubkey)
 		sys.KVStore.Set(lastFetchKey, encodeTimestamp(nostr.Now()))
-		sys.Store.SaveEvent(*v.Event)
+		sys.Store.ReplaceEvent(*v.Event)
 	}
 
 	// save cache even if we didn't get anything

sdk/metadata.go

@@ -142,7 +142,7 @@ func (sys *System) FetchProfileMetadata(ctx context.Context, pubkey nostr.PubKey
 	if newM := sys.tryFetchMetadataFromNetwork(ctx, pubkey); newM != nil {
 		pm = *newM
 
-		sys.Store.SaveEvent(*pm.Event)
+		sys.Store.ReplaceEvent(*pm.Event)
 
 		// we'll only save this if we got something which means we found at least one event
 		lastFetchKey := makeLastFetchKey(0, pubkey)