No user found - Problem with database?

Sadly Vikunja doesnt work. Now my database is empty.

I can see the database in the docker container

docker exec -it vikunja-db-1 /bin/bash

mysql -u vikunja -p
MariaDB [(none)]> SHOW DATABASES;
±-------------------+
| Database |
±-------------------+
| information_schema |
| vikunja |
±-------------------+

MariaDB [(none)]> use vikunja
MariaDB [vikunja]> SHOW tables;
MariaDB [vikunja]> SELECT * FROM users;
Empty set (0.000 sec)