drop plinth's own password db, to allow using CLI action for resetting

There is a CLI command to reset a forgotten freedombox admin password in LDAP, available from SSH as root (freedombox package installs) or rescue system (physical access):

/usr/share/plinth/actions/users set-user-password <username>

However, plinth itself still keeps a separate password store in sqlite. So a new password won't work until it is also re-set in sqlite, using a special python script (see "reset" in FAQ).

To make things work as intended,

• plinth needs to drop using its own passwords in sqlite in favor of LDAP,
• then the script can be removed from the FAQ.

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Original question: Is there a way to reset a forgotten plinth password from the SSH root login?