Always remove deleted submissions entirely instead of merely marking them as deleted #732
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Description
When deleting submissions through the legacy view (but not via the API), 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
Closes #696
Related to kobotoolbox/kpi#3287