Get Study Metrics

Raw response counts and the configured quota for a study.

All counts are real responses only (non-archived, non-mock). complete (status='closed') uses the same filter as quota enforcement. in_progress counts interviews a participant has actually started but not finished; 'open' shells that were initialized but never started are excluded. screened_out counts participants disqualified by screening logic — a distinct status, so it never overlaps complete. quota is passed through as stored — null when unset, or whatever integer the user configured (including 0). Callers derive quota-met / spots-remaining themselves from these values.