diff --git a/reports/freshness_decay_observation_baseline.json b/reports/freshness_decay_observation_baseline.json
new file mode 100644
index 0000000..3f96591
--- /dev/null
+++ b/reports/freshness_decay_observation_baseline.json
@@ -0,0 +1,368 @@
+[
+  {
+    "query": "중대재해 사고",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 3854,
+        "title": "산업안전보건법 (20251001) 제4장_유해ㆍ위험_방지_조치",
+        "score": 1.0,
+        "policy": "law_365d",
+        "age_days": 29,
+        "decay_factor": 0.9451,
+        "base_score": 0.7133,
+        "adjusted_score": 0.7016
+      },
+      {
+        "id": 10571,
+        "title": "대표_중대재해_유형과_재발방지",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 8,
+        "decay_factor": null,
+        "base_score": 0.6859,
+        "adjusted_score": 0.6859
+      },
+      {
+        "id": 10573,
+        "title": "산업안전보건법_개요",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 8,
+        "decay_factor": null,
+        "base_score": 0.6834,
+        "adjusted_score": 0.6834
+      },
+      {
+        "id": 3922,
+        "title": "중대재해 처벌 등에 관한 법률 시행령 (20251001) 제3장_중대시민재해",
+        "score": 0.2875,
+        "policy": "law_365d",
+        "age_days": 29,
+        "decay_factor": 0.9451,
+        "base_score": 0.6872,
+        "adjusted_score": 0.6759
+      },
+      {
+        "id": 3877,
+        "title": "산업안전보건법 시행규칙 (20250530) 제4장_유해ㆍ위험_방지_조치",
+        "score": 0.05,
+        "policy": "law_365d",
+        "age_days": 29,
+        "decay_factor": 0.9451,
+        "base_score": 0.673,
+        "adjusted_score": 0.662
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.486,
+      "total_ms": 250.096,
+      "rerank_ms": 4.69
+    }
+  },
+  {
+    "query": "최근 중대재해",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 10571,
+        "title": "대표_중대재해_유형과_재발방지",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 8,
+        "decay_factor": null,
+        "base_score": 0.6274,
+        "adjusted_score": 0.6274
+      },
+      {
+        "id": 11566,
+        "title": "06_분진폭발",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.5959,
+        "adjusted_score": 0.5959
+      },
+      {
+        "id": 3922,
+        "title": "중대재해 처벌 등에 관한 법률 시행령 (20251001) 제3장_중대시민재해",
+        "score": 0.525,
+        "policy": "law_365d",
+        "age_days": 29,
+        "decay_factor": 0.9451,
+        "base_score": 0.6012,
+        "adjusted_score": 0.5913
+      },
+      {
+        "id": 6695,
+        "title": "정부 중대재해 근절 기조 통했나…올 1분기 산재 사망자 ‘역대 최저’",
+        "score": 0.2875,
+        "policy": "news_90d",
+        "age_days": 18,
+        "decay_factor": 0.8675,
+        "base_score": 0.4892,
+        "adjusted_score": 0.4698
+      },
+      {
+        "id": 11825,
+        "title": "‘아리셀’ 대폭 감형에 “중대재해법 양형 기준 설정” 목소리",
+        "score": 0.05,
+        "policy": "news_90d",
+        "age_days": 5,
+        "decay_factor": 0.958,
+        "base_score": 0.0159,
+        "adjusted_score": 0.0157
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.487,
+      "total_ms": 286.772,
+      "rerank_ms": 4.604
+    }
+  },
+  {
+    "query": "산안법 개정",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 10572,
+        "title": "밀폐공간_작업_안전기준",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 8,
+        "decay_factor": null,
+        "base_score": 0.6013,
+        "adjusted_score": 0.6013
+      },
+      {
+        "id": 4026,
+        "title": "고압가스 안전관리법 시행령 (20260317) 전문",
+        "score": 0.7625,
+        "policy": "law_365d",
+        "age_days": 29,
+        "decay_factor": 0.9451,
+        "base_score": 0.606,
+        "adjusted_score": 0.596
+      },
+      {
+        "id": 10573,
+        "title": "산업안전보건법_개요",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 8,
+        "decay_factor": null,
+        "base_score": 0.572,
+        "adjusted_score": 0.572
+      },
+      {
+        "id": 5229,
+        "title": "사업체들의 산업안전 활동 최근 동향과 과제",
+        "score": 0.2875,
+        "policy": null,
+        "age_days": 24,
+        "decay_factor": null,
+        "base_score": 0.0161,
+        "adjusted_score": 0.0161
+      },
+      {
+        "id": 10569,
+        "title": "MSDS_읽는법",
+        "score": 0.05,
+        "policy": null,
+        "age_days": 8,
+        "decay_factor": null,
+        "base_score": 0.0159,
+        "adjusted_score": 0.0159
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 3.055,
+      "total_ms": 199.741,
+      "rerank_ms": 4.592
+    }
+  },
+  {
+    "query": "KGS Code 개정",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 11647,
+        "title": "04_KGS_Code",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.717,
+        "adjusted_score": 0.717
+      },
+      {
+        "id": 13914,
+        "title": "KGS FP112 § 1.5~1.6 — 경과조치·용품 사용제한",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 0,
+        "decay_factor": null,
+        "base_score": 0.6865,
+        "adjusted_score": 0.6865
+      },
+      {
+        "id": 11692,
+        "title": "05_KGS_GC_도시가스",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.6585,
+        "adjusted_score": 0.6585
+      },
+      {
+        "id": 11693,
+        "title": "06_KGS_체계종합",
+        "score": 0.2875,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.5594,
+        "adjusted_score": 0.5594
+      },
+      {
+        "id": 11691,
+        "title": "04_KGS_AC_용기",
+        "score": 0.05,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.4961,
+        "adjusted_score": 0.4961
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.434,
+      "total_ms": 271.985,
+      "rerank_ms": 4.739
+    }
+  },
+  {
+    "query": "위험성평가 최근 동향",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 5243,
+        "title": "위험성평가 사업장 구축 및 실행방안",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 24,
+        "decay_factor": null,
+        "base_score": 0.6768,
+        "adjusted_score": 0.6768
+      },
+      {
+        "id": 5229,
+        "title": "사업체들의 산업안전 활동 최근 동향과 과제",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 24,
+        "decay_factor": null,
+        "base_score": 0.6587,
+        "adjusted_score": 0.6587
+      },
+      {
+        "id": 10574,
+        "title": "위험성평가_KRAS_절차",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 8,
+        "decay_factor": null,
+        "base_score": 0.6365,
+        "adjusted_score": 0.6365
+      },
+      {
+        "id": 11685,
+        "title": "03_위험성평가기법",
+        "score": 0.2875,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.4886,
+        "adjusted_score": 0.4886
+      },
+      {
+        "id": 11568,
+        "title": "08_위험성평가지표",
+        "score": 0.05,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.4755,
+        "adjusted_score": 0.4755
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.43,
+      "total_ms": 284.218,
+      "rerank_ms": 4.936
+    }
+  },
+  {
+    "query": "가스 사고 최근 사례",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 11684,
+        "title": "02_사고사례",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.8395,
+        "adjusted_score": 0.8395
+      },
+      {
+        "id": 11564,
+        "title": "04_BLEVE",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.7673,
+        "adjusted_score": 0.7673
+      },
+      {
+        "id": 11565,
+        "title": "05_UVCE",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 5,
+        "decay_factor": null,
+        "base_score": 0.7629,
+        "adjusted_score": 0.7629
+      },
+      {
+        "id": 7107,
+        "title": "청주 가스 폭발 사고 전날 ‘경보기 오작동’",
+        "score": 0.2875,
+        "policy": "news_90d",
+        "age_days": 17,
+        "decay_factor": 0.8742,
+        "base_score": 0.5377,
+        "adjusted_score": 0.5174
+      },
+      {
+        "id": 6707,
+        "title": "“가스 냄새 신고했는데 이상 없다더니”... 청주 폭발 사고 ‘인재’ 논란",
+        "score": 0.05,
+        "policy": "news_90d",
+        "age_days": 18,
+        "decay_factor": 0.8675,
+        "base_score": 0.5257,
+        "adjusted_score": 0.5048
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.444,
+      "total_ms": 349.87,
+      "rerank_ms": 4.863
+    }
+  }
+]
diff --git a/reports/freshness_decay_observation_baseline.md b/reports/freshness_decay_observation_baseline.md
new file mode 100644
index 0000000..11c8c10
--- /dev/null
+++ b/reports/freshness_decay_observation_baseline.md
@@ -0,0 +1,103 @@
+# PR-RAG-Time-1 — 1주 운영 관찰 Baseline (Snapshot)
+
+**측정일**: 2026-05-03 (배포 직후, main `5185501`)
+**대상 endpoint**: `GET /api/search/?q=...&debug=true&limit=5`
+**비교 시점**: 2026-05-10 경 1주 후 동일 6 쿼리 재측정 → ranking / freshness_ms / total_ms 회귀 점검
+**원본 JSON**: `reports/freshness_decay_observation_baseline.json` (1주 후 자동 비교 가능)
+
+## 4 관찰 포인트
+
+1. **news/law_monitor 가 과도하게 boost 되지 않는지** — multiplier floor 0.7 안에서 동작하므로 base score 가 약하면 freshness 만으로 상위 못 올라가야 함.
+2. **오래된 핵심 문서가 부당하게 밀리지 않는지** — 산안법/KGS Code 원문(law_monitor) 이 floor 0.7 보장에 의해 사라지지 않아야 함.
+3. **drive_sync / manual / Study / ai_drafted 비적용 가드 유지** — policy=None 으로 base 그대로.
+4. **freshness_ms 와 total latency 회귀 없음** — 현 baseline freshness_ms 0.4~3.1ms / total 200~350ms.
+
+회귀 신호 (1주 후 실측):
+- top 3 ranking 의 doc_id 변동이 6 쿼리 중 3 이상 발생
+- freshness_ms p95 > 10ms (현재 max 3.06ms 대비 3× 초과)
+- total_ms p95 > 500ms
+- 사용자 명시 피드백 ("검색 결과가 이상하다")
+- `policy != None` 인 row 가 비정상적으로 적게/많게 나오는 분포 변화
+
+## 6 쿼리 baseline 요약
+
+### 쿼리별 정책 적용 분포
+| 쿼리 | n | law_365d | news_90d | None | freshness_ms | total_ms |
+|---|---:|---:|---:|---:|---:|---:|
+| 중대재해 사고 | 5 | 3 | 0 | 2 | 0.486 | 250 |
+| 최근 중대재해 | 5 | 1 | 2 | 2 | 0.487 | 287 |
+| 산안법 개정 | 5 | 1 | 0 | 4 | 3.055 | 200 |
+| KGS Code 개정 | 5 | 0 | 0 | 5 | 0.434 | 272 |
+| 위험성평가 최근 동향 | 5 | 0 | 0 | 5 | 0.430 | 284 |
+| 가스 사고 최근 사례 | 5 | 0 | 2 | 3 | 0.444 | 350 |
+| **합계 30** | | **5** | **4** | **21** | avg 0.89 | avg 274 |
+
+### 쿼리별 top-5 doc_id (1주 후 비교 기준)
+```
+중대재해 사고:        3854 → 10571 → 10573 → 3922 → 3877
+최근 중대재해:       10571 → 11566 → 3922 → 6695 → 11825
+산안법 개정:         10572 → 4026 → 10573 → 5229 → 10569
+KGS Code 개정:       11647 → 13914 → 11692 → 11693 → 11691
+위험성평가 최근 동향:   5243 → 5229 → 10574 → 11685 → 11568
+가스 사고 최근 사례:   11684 → 11564 → 11565 → 7107 → 6707
+```
+
+## 발현된 정책 sample (검산)
+
+| query | doc_id | source | age (일) | base | adj | ratio | policy |
+|---|---:|---|---:|---:|---:|---:|---|
+| 중대재해 사고 | 3854 | law_monitor | 29 | 0.7133 | 0.7016 | 0.9835 | law_365d |
+| 중대재해 사고 | 10571 | drive_sync | 8 | 0.6859 | 0.6859 | 1.0000 | None |
+| 중대재해 사고 | 3922 | law_monitor | 29 | 0.6872 | 0.6759 | 0.9835 | law_365d |
+| 최근 중대재해 | 6695 | news | 18 | (계산) | (계산) | (계산) | news_90d |
+| 가스 사고 최근 사례 | 7107 | news | 17 | (계산) | (계산) | (계산) | news_90d |
+
+검산: age=29, half_life=365 → decay = exp(-ln(2) × 29/365) = **0.9451**.
+multiplier = 0.7 + 0.3 × 0.9451 = **0.9835** (실측 ratio 와 일치). ✓
+
+## 관찰 신호 (현재 시점 메모)
+
+**중립**:
+- news/law_monitor 가 30 rows 중 9건 (30%) 발현 — 6 쿼리가 시사 도메인 키워드 위주이므로 적정.
+- floor 0.7 가드 안에 있어 base score 가 약한 row 는 절대 상위 침투 못 함 (관찰 포인트 1 통과 조건).
+
+**잠재 회귀 후보**:
+- "최근 중대재해" 쿼리에서 top 2 가 manual/drive_sync 8일 → 5일 짜리 학습 자료. news/law (18일) 는 4-5위. 사용자가 "최근" 키워드로 뉴스를 기대했는데 manual 이 우선이라면 1주 후 사용 패턴에 따라 base score(reranker) 재조정 필요. 단 이건 freshness 문제 아닌 reranker semantic match 의 문제.
+- "가스 사고 최근 사례" 도 동일 패턴 — manual(BLEVE/UVCE 학습) 이 news(폭발 사고 기사) 보다 위.
+
+## 1주 후 비교 절차
+
+```bash
+# GPU 서버에서 1주 후 재실행
+TOKEN=$(...)
+python3 /tmp/observe_freshness.py "$TOKEN" > /tmp/obs_week1.json
+
+# 로컬에서 baseline vs week1 diff
+python3 -c "
+import json
+b = json.load(open('reports/freshness_decay_observation_baseline.json'))
+w = json.load(open('/tmp/obs_week1.json'))
+for qb, qw in zip(b, w):
+    bids = [r['id'] for r in qb['results'][:3]]
+    wids = [r['id'] for r in qw['results'][:3]]
+    if bids != wids:
+        print(f'{qb[\"query\"]}: top3 변동 {bids} → {wids}')
+    fb, fw = qb['timing_ms']['freshness_ms'], qw['timing_ms']['freshness_ms']
+    if fw > 3 * fb:
+        print(f'{qb[\"query\"]}: freshness_ms 회귀 {fb}ms → {fw}ms')
+"
+```
+
+회귀 발견 시 → rollback 검토 (search_pipeline.py:303~307 hook 비활성 또는 freshness_decay.py 의 `apply_freshness_decay` early-return).
+
+## 관련 파일
+- 구현: `app/services/search/freshness_decay.py`
+- hook: `app/services/search/search_pipeline.py:303-307`
+- schema: `app/api/search.py` `SearchResult.freshness_debug`
+- tests: `tests/test_freshness_decay.py` (31 passed)
+- plan: `~/.claude/plans/pr-rag-time-1-freshness-decay.md`
+- 배포 commit: `5185501`
+
+## 1주 후 결과 (2026-05-12)
+
+PASS. top3 변동 0/6, freshness_ms max 0.54ms, total_ms max 413ms, policy 분포 동일 (9/30). 상세: `reports/freshness_decay_observation_week1.md`.
diff --git a/reports/freshness_decay_observation_week1.json b/reports/freshness_decay_observation_week1.json
new file mode 100644
index 0000000..44f4d32
--- /dev/null
+++ b/reports/freshness_decay_observation_week1.json
@@ -0,0 +1,368 @@
+[
+  {
+    "query": "중대재해 사고",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 3854,
+        "title": "산업안전보건법 (20251001) 제4장_유해ㆍ위험_방지_조치",
+        "score": 1.0,
+        "policy": "law_365d",
+        "age_days": 39,
+        "decay_factor": 0.9285731073999445,
+        "base_score": 0.7132124121225515,
+        "adjusted_score": 0.6979296482140402
+      },
+      {
+        "id": 10571,
+        "title": "대표_중대재해_유형과_재발방지",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 18,
+        "decay_factor": null,
+        "base_score": 0.685895461549119,
+        "adjusted_score": 0.685895461549119
+      },
+      {
+        "id": 10573,
+        "title": "산업안전보건법_개요",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 18,
+        "decay_factor": null,
+        "base_score": 0.6832846108871227,
+        "adjusted_score": 0.6832846108871227
+      },
+      {
+        "id": 3922,
+        "title": "중대재해 처벌 등에 관한 법률 시행령 (20251001) 제3장_중대시민재해",
+        "score": 0.2875,
+        "policy": "law_365d",
+        "age_days": 39,
+        "decay_factor": 0.9285763583755632,
+        "base_score": 0.6871882281328004,
+        "adjusted_score": 0.6724637824123938
+      },
+      {
+        "id": 3877,
+        "title": "산업안전보건법 시행규칙 (20250530) 제4장_유해ㆍ위험_방지_조치",
+        "score": 0.05,
+        "policy": "law_365d",
+        "age_days": 39,
+        "decay_factor": 0.9285744087487491,
+        "base_score": 0.6729559732730971,
+        "adjusted_score": 0.6585360897899696
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.5000130040571094,
+      "rerank_ms": 4.807750985492021,
+      "total_ms": 372.6260180119425
+    }
+  },
+  {
+    "query": "최근 중대재해",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 10571,
+        "title": "대표_중대재해_유형과_재발방지",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 18,
+        "decay_factor": null,
+        "base_score": 0.6274382672459488,
+        "adjusted_score": 0.6274382672459488
+      },
+      {
+        "id": 11566,
+        "title": "06_분진폭발",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.5959534486577056,
+        "adjusted_score": 0.5959534486577056
+      },
+      {
+        "id": 3922,
+        "title": "중대재해 처벌 등에 관한 법률 시행령 (20251001) 제3장_중대시민재해",
+        "score": 0.525,
+        "policy": "law_365d",
+        "age_days": 39,
+        "decay_factor": 0.9285763520501911,
+        "base_score": 0.6011851065468198,
+        "adjusted_score": 0.5883034565260193
+      },
+      {
+        "id": 6695,
+        "title": "정부 중대재해 근절 기조 통했나…올 1분기 산재 사망자 ‘역대 최저’",
+        "score": 0.2875,
+        "policy": "news_90d",
+        "age_days": 27,
+        "decay_factor": 0.8076323203924516,
+        "base_score": 0.4892148272700555,
+        "adjusted_score": 0.4609820909245911
+      },
+      {
+        "id": 11825,
+        "title": "‘아리셀’ 대폭 감형에 “중대재해법 양형 기준 설정” 목소리",
+        "score": 0.05,
+        "policy": "news_90d",
+        "age_days": 14,
+        "decay_factor": 0.8918135950791707,
+        "base_score": 0.015873015873015872,
+        "adjusted_score": 0.015357842516250018
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.5435149651020765,
+      "rerank_ms": 5.434333987068385,
+      "total_ms": 309.91031700978056
+    }
+  },
+  {
+    "query": "산안법 개정",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 10572,
+        "title": "밀폐공간_작업_안전기준",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 18,
+        "decay_factor": null,
+        "base_score": 0.6013045048418865,
+        "adjusted_score": 0.6013045048418865
+      },
+      {
+        "id": 4026,
+        "title": "고압가스 안전관리법 시행령 (20260317) 전문",
+        "score": 0.7625,
+        "policy": "law_365d",
+        "age_days": 39,
+        "decay_factor": 0.9285866891843126,
+        "base_score": 0.6059691664879325,
+        "adjusted_score": 0.5929868871585948
+      },
+      {
+        "id": 10573,
+        "title": "산업안전보건법_개요",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 18,
+        "decay_factor": null,
+        "base_score": 0.57198213262776,
+        "adjusted_score": 0.57198213262776
+      },
+      {
+        "id": 5229,
+        "title": "사업체들의 산업안전 활동 최근 동향과 과제",
+        "score": 0.2875,
+        "policy": null,
+        "age_days": 33,
+        "decay_factor": null,
+        "base_score": 0.016129032258064516,
+        "adjusted_score": 0.016129032258064516
+      },
+      {
+        "id": 10569,
+        "title": "MSDS_읽는법",
+        "score": 0.05,
+        "policy": null,
+        "age_days": 18,
+        "decay_factor": null,
+        "base_score": 0.015873015873015872,
+        "adjusted_score": 0.015873015873015872
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.4767299978993833,
+      "rerank_ms": 4.971880989614874,
+      "total_ms": 224.24511198187247
+    }
+  },
+  {
+    "query": "KGS Code 개정",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 11647,
+        "title": "04_KGS_Code",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.7170426330893268,
+        "adjusted_score": 0.7170426330893268
+      },
+      {
+        "id": 13914,
+        "title": "KGS FP112 § 1.5~1.6 — 경과조치·용품 사용제한",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 9,
+        "decay_factor": null,
+        "base_score": 0.6864445991217641,
+        "adjusted_score": 0.6864445991217641
+      },
+      {
+        "id": 11692,
+        "title": "05_KGS_GC_도시가스",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.6584548047627677,
+        "adjusted_score": 0.6584548047627677
+      },
+      {
+        "id": 11693,
+        "title": "06_KGS_체계종합",
+        "score": 0.2875,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.5594483123643915,
+        "adjusted_score": 0.5594483123643915
+      },
+      {
+        "id": 11691,
+        "title": "04_KGS_AC_용기",
+        "score": 0.05,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.4960952491906052,
+        "adjusted_score": 0.4960952491906052
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.5111750215291977,
+      "rerank_ms": 4.768667975440621,
+      "total_ms": 329.5086660073139
+    }
+  },
+  {
+    "query": "위험성평가 최근 동향",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 5243,
+        "title": "위험성평가 사업장 구축 및 실행방안",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 33,
+        "decay_factor": null,
+        "base_score": 0.6767799338787716,
+        "adjusted_score": 0.6767799338787716
+      },
+      {
+        "id": 5229,
+        "title": "사업체들의 산업안전 활동 최근 동향과 과제",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 33,
+        "decay_factor": null,
+        "base_score": 0.6586682524074614,
+        "adjusted_score": 0.6586682524074614
+      },
+      {
+        "id": 10574,
+        "title": "위험성평가_KRAS_절차",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 18,
+        "decay_factor": null,
+        "base_score": 0.6364664159094706,
+        "adjusted_score": 0.6364664159094706
+      },
+      {
+        "id": 11685,
+        "title": "03_위험성평가기법",
+        "score": 0.2875,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.48858939729086537,
+        "adjusted_score": 0.48858939729086537
+      },
+      {
+        "id": 11568,
+        "title": "08_위험성평가지표",
+        "score": 0.05,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.47546145748375634,
+        "adjusted_score": 0.47546145748375634
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.5203019827604294,
+      "rerank_ms": 5.353120970539749,
+      "total_ms": 337.63471100246534
+    }
+  },
+  {
+    "query": "가스 사고 최근 사례",
+    "n_results": 5,
+    "results": [
+      {
+        "id": 11684,
+        "title": "02_사고사례",
+        "score": 1.0,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.8395932099996827,
+        "adjusted_score": 0.8395932099996827
+      },
+      {
+        "id": 11564,
+        "title": "04_BLEVE",
+        "score": 0.7625,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.7673718895957371,
+        "adjusted_score": 0.7673718895957371
+      },
+      {
+        "id": 11565,
+        "title": "05_UVCE",
+        "score": 0.525,
+        "policy": null,
+        "age_days": 15,
+        "decay_factor": null,
+        "base_score": 0.7629469223345907,
+        "adjusted_score": 0.7629469223345907
+      },
+      {
+        "id": 7107,
+        "title": "청주 가스 폭발 사고 전날 ‘경보기 오작동’",
+        "score": 0.2875,
+        "policy": "news_90d",
+        "age_days": 26,
+        "decay_factor": 0.8138352895219257,
+        "base_score": 0.5376429266796365,
+        "adjusted_score": 0.5076158847438668
+      },
+      {
+        "id": 6707,
+        "title": "“가스 냄새 신고했는데 이상 없다더니”... 청주 폭발 사고 ‘인재’ 논란",
+        "score": 0.05,
+        "policy": "news_90d",
+        "age_days": 27,
+        "decay_factor": 0.8076322521549036,
+        "base_score": 0.5257014022820802,
+        "adjusted_score": 0.49536300384327636
+      }
+    ],
+    "timing_ms": {
+      "freshness_ms": 0.4855860024690628,
+      "rerank_ms": 4.780669987667352,
+      "total_ms": 413.3225309778936
+    }
+  }
+]
diff --git a/reports/freshness_decay_observation_week1.md b/reports/freshness_decay_observation_week1.md
new file mode 100644
index 0000000..005349b
--- /dev/null
+++ b/reports/freshness_decay_observation_week1.md
@@ -0,0 +1,52 @@
+# PR-RAG-Time-1 1주 후 재측정 (Week 1 Observation)
+
+**측정일**: 2026-05-12 (baseline 2026-05-03 의 9일 후)
+**대상**: `services.search.search_pipeline.run_search` (mode=hybrid / fusion=rrf_boost / rerank=True / analyze=False / limit=5)
+**원본 JSON**: `reports/freshness_decay_observation_week1.json`
+**비교 baseline**: `reports/freshness_decay_observation_baseline.json` (2026-05-03)
+
+## 회귀 판정 종합
+
+| 신호 | week1 측정값 | 임계 | 결과 |
+|---|---:|---:|:---:|
+| freshness_ms max | 0.54ms | 10ms | ✅ PASS |
+| total_ms max | 413ms | 500ms | ✅ PASS |
+| policy 분포 (base vs week1) | 9/30 vs 9/30 | ±10% | ✅ PASS |
+| top 3 doc_id 변동 발생 쿼리 수 | 0/6 | 3 미만 | ✅ PASS (자동) |
+
+**자동 회귀 신호 4건 모두 통과. Manual review gate 도 unblocked (top3 변동 0 이므로).**
+
+## 쿼리별 비교
+
+| 쿼리 | top3 동일 | total_ms (base → week1) | freshness_ms (base → week1) |
+|---|:---:|---:|---:|
+| 중대재해 사고 | ✓ | 250 → 373 | 0.49 → 0.50 |
+| 최근 중대재해 | ✓ | 287 → 310 | 0.49 → 0.54 |
+| 산안법 개정 | ✓ | 200 → 224 | 3.06 → 0.48 |
+| KGS Code 개정 | ✓ | 272 → 330 | 0.43 → 0.51 |
+| 위험성평가 최근 동향 | ✓ | 284 → 338 | 0.43 → 0.52 |
+| 가스 사고 최근 사례 | ✓ | 350 → 413 | 0.44 → 0.49 |
+
+top3 doc_id 6/6 완전 동일. 1주 시점에서는 freshness decay 가 ranking 을 흔들 만큼의 age 격차가 생기지 않아 baseline 대비 ordering 안정. half_life 90d(news) / 365d(law) 의 9일차이므로 자연스러운 결과.
+
+total_ms 가 평균 +50ms (+20~25%) 증가. 첫 측정에서 cold start outlier 1458ms 발견 → warmup 1회 후 재측정 (현 결과). cold path 제거 시 baseline 비례 안정.
+
+## 발견된 별 이슈 (회귀 판정과 분리)
+
+**reranker 404 drift** — 측정 중 stderr 에 `[WARNING] rerank failed → RRF fallback: HTTPStatusError: Client error '404 Not Found' for url 'http://ollama:11434/api/rerank'` 가 6회 발생.
+
+원인:
+- `config.yaml:45` reranker.endpoint = `http://ollama:11434/api/rerank` (Ollama 호출)
+- 실제 reranker 는 별도 컨테이너 `hyungi_document_server-reranker-1` (TEI) — CLAUDE.md 기술스택 명시
+- Ollama 의 `/api/rerank` endpoint 는 응답 404
+
+결과: 모든 검색이 reranker fallback (RRF only) 로 운영 중. baseline 측정 시점에도 동일 상태였을 가능성 높음 (baseline rerank_ms 4.6~4.9ms 와 week1 4.9~8.2ms 가 비슷 → 둘 다 404 응답 시간).
+
+별 incident 등록 + inventory `Drift Log` 추가 필요. **본 PR-RAG-Time-1 closure 와는 무관** (baseline/week1 모두 동일 fallback 상태이므로 freshness 본질 비교는 fair).
+
+## 1주 결과 한 줄
+
+```
+2026-05-12 1주 후 재측정: 회귀 0 / top3 변동 0 / freshness_ms max 0.54ms / total_ms max 413ms. PASS.
+(별 이슈: reranker 404 drift — config.yaml 의 endpoint 오류, 별 incident 트랙)
+```