Remove unnecessary filter from database queries #3287
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Description
When deleting submissions through the legacy KoBoCAT UI, a special marker was applied to the "deleted" submissions instead of removing them outright. This meant that every query to retrieve submitted data needed to filter out submissions having this marker. We now always remove submissions outright when deleting and therefore no longer need this extra filter, which caused high database overhead.
Related issues
Part of kobotoolbox/kobocat#696