bolt: fix count.

bolt/count.go

@@ -26,10 +26,20 @@ func (b *BoltBackend) CountEvents(ctx context.Context, filter nostr.Filter) (int
 			raw := txn.Bucket(bucketRaw)
 
 			c := bucket.Cursor()
-			for k, v := c.Seek(q.startingPoint); k != nil && bytes.HasPrefix(k, q.prefix); k, v = c.Prev() {
+
+			key, _ := c.Seek(q.startingPoint)
+			if key == nil {
+				key, _ = c.Last()
+			} else {
+				key, _ = c.Prev()
+			}
+
+			for ; key != nil && bytes.HasPrefix(key, q.prefix); key, _ = c.Prev() {
+				idxOffset := len(key) - 4 // this is where the idx actually starts
+
 				// "id" indexes don't contain a timestamp
 				if !q.skipTimestamp {
-					createdAt := binary.BigEndian.Uint32(k[len(k)-4:])
+					createdAt := binary.BigEndian.Uint32(key[idxOffset-4 : idxOffset])
 					if createdAt < since {
 						break
 					}
@@ -39,7 +49,7 @@ func (b *BoltBackend) CountEvents(ctx context.Context, filter nostr.Filter) (int
 					count++
 				} else {
 					// fetch actual event
-					val := raw.Get(v)
+					val := raw.Get(key[len(key)-4:])
 					evt := &nostr.Event{}
 					if err := nostr_binary.Unmarshal(val, evt); err != nil {
 						log.Printf("bolt: value read error (id %x): %s\n", val[0:32], err)