Admin account lost on joplin server

hi all, i am using joplin server (Joplin Server 2.10.10, a docker instance on a synology nas) for a while now and it works very fine.
But i have lost my admin account. I am working with a default account now, but no admin account where i can add users or do something else to manage.
I know this is rather stupid, but i do not know anymore how ths could happen because i installed this server quite a while ago,
is there a way to get back my admin account again?
sorry for the inconvenience that i caused with my stupidity.
wyl

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