badger/lmdb: fix tag sorting when they are small.

utils.go

@@ -4,6 +4,8 @@ import (
 	"encoding/hex"
 	"strconv"
 	"strings"
+
+	"github.com/nbd-wtf/go-nostr"
 )
 
 func GetAddrTagElements(tagValue string) (kind uint16, pkb []byte, d string) {
@@ -17,3 +19,16 @@ func GetAddrTagElements(tagValue string) (kind uint16, pkb []byte, d string) {
 	}
 	return 0, nil, ""
 }
+
+func TagSorter(a, b nostr.Tag) int {
+	if len(a) < 2 {
+		if len(b) < 2 {
+			return 0
+		}
+		return -1
+	}
+	if len(b) < 2 {
+		return 1
+	}
+	return strings.Compare(a[1], b[1])
+}