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MHSanaei
92303094fd
Redacted secrets (SMTP password, Telegram bot token, LDAP password) are always served blank to the browser, so the update path treats a blank submission as "unchanged" and silently restores the stored value. That made a once-set secret impossible to remove without editing the database — e.g. switching to a passwordless localhost SMTP relay kept sending the old credentials forever. Blank stays "unchanged"; clearing is now its own signal. The update request carries explicit clear flags (request-scoped fields on the controller form, so they are never persisted as settings rows), and preserveRedactedSecrets skips the restore for a flagged secret. Each secret field gets a Clear/Undo button that arms the flag; typing a new value disarms it. The 2FA token keeps its existing behavior: it is already clearable by disabling 2FA. Closes #5724