diff --git a/migrations/153_analyze_events_shadow.sql b/migrations/153_analyze_events_shadow.sql
new file mode 100644
index 0000000..4dd9f35
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+++ b/migrations/153_analyze_events_shadow.sql
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+-- 153_analyze_events_shadow.sql
+-- AI Policy Layer (PR-A) — shadow 관측용 컬럼만 추가. 아무도 쓰지 않음.
+-- PR-B 가 DBShadowLogger 구현 후 writer 추가 예정.
+--
+-- plan: ~/.claude/plans/wise-gliding-hippo.md
+-- axis 원칙: feedback_category_vs_ai_domain_axis.md (subject_domain 은 정책 축,
+--            documents.category 매칭 키로 쓰지 않음)
+--
+-- 주의: _run_migrations 는 단일 outer 트랜잭션으로 실행됨 — BEGIN/COMMIT 금지.
+
+ALTER TABLE analyze_events
+    ADD COLUMN IF NOT EXISTS subject_domain        TEXT,
+    ADD COLUMN IF NOT EXISTS risk_flags            TEXT[],
+    ADD COLUMN IF NOT EXISTS high_impact_task      BOOLEAN,
+    ADD COLUMN IF NOT EXISTS escalated_to_26b      BOOLEAN,
+    ADD COLUMN IF NOT EXISTS escalation_reasons    TEXT[],
+    ADD COLUMN IF NOT EXISTS confidence            REAL,
+    ADD COLUMN IF NOT EXISTS policy_violation      BOOLEAN,
+    ADD COLUMN IF NOT EXISTS policy_violation_ids  TEXT[],
+    ADD COLUMN IF NOT EXISTS shadow_would_route_to TEXT,
+    ADD COLUMN IF NOT EXISTS policy_version        TEXT;
+
+CREATE INDEX IF NOT EXISTS idx_analyze_events_shadow_ts
+    ON analyze_events (created_at)
+    WHERE shadow_would_route_to IS NOT NULL;
+
+CREATE INDEX IF NOT EXISTS idx_analyze_events_policy_violation
+    ON analyze_events (created_at)
+    WHERE policy_violation = true;