fix lowercase to num

main.go

@@ -65,6 +65,8 @@ func main() {
 	if n, err := SelectOne[int](jellyfinDB, `SELECT COUNT(*) FROM Users WHERE Username = $1`, toU); err != nil {
 		log.Fatalf("%v", err)
 	} else if n != 1 {
+		log.Println("creating user", toU, "from", fromU)
+
 		nextID, err := SelectOne[int](libraryDB, `SELECT COALESCE(MAX(userId), 0)+1 FROM UserDatas`)
 		if err != nil {
 			log.Fatalf("failed to get max userid ever: %v", err)
@@ -79,6 +81,8 @@ func main() {
 		} else if n != 1 {
 			log.Fatalf("still no username=%q after insert", toU)
 		}
+	} else {
+		log.Println("user", toU, "already exists")
 	}
 
 	toUUID, err := SelectOne[string](jellyfinDB, `SELECT Id FROM Users WHERE Username = $1`, toU)
@@ -402,7 +406,7 @@ func Select[T any](db *sql.DB, q string, args ...any) ([]T, error) {
 func guid() string {
 	s := []byte(uuid.New().String())
 	for i := range s {
-		if 'A' <= s[i] && s[i] <= 'Z' {
+		if ('A' <= s[i] && s[i] <= 'Z') || ('a' <= s[i] && s[i] <= 'z') {
 			s[i] = '0' + byte(int(s[i])%10)
 		}
 	}