Explore possibility of "Extend Survey" status?

Such a status would make the tool ignore the 90-day time period to finish the survey, and not set the record to a final status (except Survey: Complete).

Maybe just extend the time period automatically by 15 / 30 days? Add this setting to the admin interface?

No files, tests, or entry points are named. Start by clarifying whether the desired behavior is an Extend Survey status, automatic 15/30-day extensions, or an admin setting, then trace the survey status and 90-day expiry behavior. Done should include an agreed rule for final statuses and the corresponding admin-interface behavior.

Written by the indexing model from the issue text.