From 70b27d4a5145688d3d1631e1c7d7d0573f849ad7 Mon Sep 17 00:00:00 2001
From: Hyungi Ahn <hyungiahn@Hyungiui-MacBookPro.local>
Date: Tue, 7 Apr 2026 08:37:13 +0900
Subject: [PATCH] =?UTF-8?q?fix(search):=20confidence=20=EC=9E=84=EA=B3=84?=
 =?UTF-8?q?=EA=B0=92=20=EC=99=84=ED=99=94=20+=20hybrid=20+vector=20boost?=
 =?UTF-8?q?=20=EA=B0=80=EC=82=B0?=
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baseline 평가셋 실행 시 'summary+vector' top_score 2.39가 임계값 2.5에
미달해 정답 쿼리(산업안전보건법 제6장)가 low_confidence로 잘못 잡힘.

- 텍스트 매치 임계값 0.5씩 완화 (실측 분포 반영)
- '+vector' 접미사가 있으면 hybrid 합성 매치이므로 confidence +0.10 가산
- 정답률 5/5 → 4/5 false-positive 1건 제거 기대

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 app/services/search_telemetry.py | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/app/services/search_telemetry.py b/app/services/search_telemetry.py
index 3260420..bc6e05c 100644
--- a/app/services/search_telemetry.py
+++ b/app/services/search_telemetry.py
@@ -103,17 +103,22 @@ def compute_confidence(results: list[Any], mode: str) -> float:
         # 코사인 유사도 그대로
         return _cosine_to_confidence(top_score)
 
-    # text / hybrid: 강한 텍스트 매치 우선 판정
-    if "title" in reason and top_score >= 4.0:
-        return 0.95
-    if any(k in reason for k in ("tags", "note")) and top_score >= 3.0:
-        return 0.85
-    if "summary" in reason and top_score >= 2.5:
-        return 0.75
-    if "content" in reason and top_score >= 2.0:
-        return 0.65
+    # hybrid에서 텍스트+벡터 합성 매치는 reason에 "+vector" 접미. 신뢰 가산.
+    has_vector_boost = "+vector" in reason
+    boost = 0.10 if has_vector_boost else 0.0
+
+    # text / hybrid: 강한 텍스트 매치 우선 판정.
+    # 임계값은 search.py의 가중치 합산 분포(텍스트base + FTS bonus + 0.5*cosine)를 반영.
+    if "title" in reason and top_score >= 3.5:
+        return min(1.0, 0.95 + boost)
+    if any(k in reason for k in ("tags", "note")) and top_score >= 2.5:
+        return min(1.0, 0.85 + boost)
+    if "summary" in reason and top_score >= 2.0:
+        return min(1.0, 0.75 + boost)
+    if "content" in reason and top_score >= 1.5:
+        return min(1.0, 0.65 + boost)
     if "fts" in reason and top_score >= 1.0:
-        return 0.55
+        return min(1.0, 0.55 + boost)
 
     # vector-only hit (텍스트 0건 → 코사인 raw, amplify 금지)
     if reason == "vector":