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Not sure I'm getting this across 😛

use master password for what?

The master password somehow lets you impersonate?

i.e. for an admin to see a user's account as it is without affecting that user

https://curity.io/resources/learn/impersonation-flow-approaches/

The only popular auth providers that have it that I know of are keycloak and authentik... But its a pretty crucial feature. Not sure if casdoor has it (or if anyone has achieved it using casdoor), so asking here.