"I created an admin but forgot the password"

Reset the password for any existing user account:

sudo /opt/bng-deploy/bin/reset-user-password.sh <username>

Replace <username> with the account name. The script prompts you to enter a
new password (confirmed twice), writes it to users.json using the same
argon2id hash the application uses at login, and immediately invalidates all
existing sessions for that user. The user (or you, on their behalf) can then
log in with the new password.

This operation is logged in the audit trail as event:auth.password_reset.