-- 162_analyze_events_answerability_idx.sql
-- PR-B B-2: answerability 분포 조회 인덱스 (대시보드 "에스컬레이션 비율" 카드).

CREATE INDEX IF NOT EXISTS idx_analyze_events_answerability
    ON analyze_events (answerability, created_at DESC)
    WHERE answerability IS NOT NULL;
