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The data model contains accountExpires date, but it is not currently used.

1. Update accountExpires to +6 months on every successful login
2. Add scheduled task to send email notification to users 40 days before expiration.
3. Add scheduled task to send email notification to users 10 days before expiration.
4. Add scheduled task that calls remove account function (see #252 (closed)) for all accounts past expiration date.
5. Alternatively: just disable the user account and remove accounts manually through admin tool.

Different email templates are required for email notifications.