docs(changelog): v0.1.19 #293 검색/벡터 결함 기록

- SearchController: q 빈값 가드 (HTTP 400) — '%%' LIKE 응답 폭발 차단
- SearchService:
  - keywordSearch: LIKE 와일드카드 escape (%, _, \\)
  - hybrid 모드: semantic 결과에도 attachChannels 호출 (이전: keyword만)
  - ObjectMapper/TypeReference static 재사용 (캐시 hit 경로 GC 압박 완화)
  - 알 수 없는 mode → warn 로그 + keyword fallback (이전: silent)
  - maxDistance를 @Value("${app.search.max-distance:0.57}")로 외부화
- SearchMapper.xml: LIKE 절에 ESCAPE '\\' 추가
- VectorService.searchSimilar: embeddings/first list null/empty 가드 (NPE 방지)
- application.yml: app.search.max-distance (env SEARCH_MAX_DISTANCE) 추가

후속 분리: batch insert + 테스트 (별도 후속 이슈)

Refs: #293

CHANGELOG.md

@@ -6,6 +6,27 @@
 
 ## 2026-06-15
 
+### 🔍 #293 검색/벡터 결함 7건 (v0.1.19)
+- SearchController: q 빈값 400 가드 (`%%` 응답 폭발 차단)
+- SearchService: LIKE 와일드카드 escape (%, _, \), hybrid 모드에서 sem 결과에도 채널 부착
+- SearchService: ObjectMapper/TypeReference static 재사용, 알 수 없는 mode warn 로그
+- SearchService: maxDistance를 @Value("${app.search.max-distance:0.57}") 외부화 (env SEARCH_MAX_DISTANCE)
+- SearchMapper.xml: LIKE 절에 ESCAPE '\' 추가
+- VectorService: embeddings null/empty 가드 (NPE 차단)
+- 후속 분리: #331 (batch insert + 테스트)
+- Refs: #293 (close)
+
+### 🛠 #304+#323 어드민 LLM 검증 UI + 공통 유틸 (v0.1.18)
+- 신규 frontend/src/lib/admin-utils.ts:
+  - getAdminToken / authHeaders / consumeSseStream
+- api.ts: Restaurant 타입에 hidden/hidden_reason/verified_at + verify/setRestaurantHidden API 4개
+- RestaurantsPanel:
+  - 헤더: "미검증 N건 + LLM 검증" 버튼
+  - 테이블: 검증 컬럼 (숨김/OK/미검증 배지 + 클릭으로 토글)
+- colSpan 7로 수정
+- 후속 분리: #329 (admin 전체 파일 분리 + localStorage/SSE 11+곳 통일)
+- Refs: #304 #323 #322 (close)
+
 ### 🔧 #291+#292 백엔드 결함 일괄 수정 (v0.1.17)
 - ExtractorService: transcript null/blank 가드 (NPE 방지)
 - PipelineService.processExtract: 진입 시 status='processing' 명시 전이 (SSE/사용자 가시성)

backend-java/src/main/java/com/tasteby/controller/SearchController.java

@@ -2,7 +2,9 @@ package com.tasteby.controller;
 
 import com.tasteby.domain.Restaurant;
 import com.tasteby.service.SearchService;
+import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.*;
+import org.springframework.web.server.ResponseStatusException;
 
 import java.util.List;
 
@@ -21,7 +23,12 @@ public class SearchController {
             @RequestParam String q,
             @RequestParam(defaultValue = "keyword") String mode,
             @RequestParam(defaultValue = "20") int limit) {
+        // #293 — q 빈값 가드: '%%' LIKE로 응답 폭발 차단
+        if (q == null || q.isBlank()) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "검색어가 필요합니다");
+        }
         if (limit > 100) limit = 100;
-        return searchService.search(q, mode, limit);
+        if (limit < 1) limit = 1;
+        return searchService.search(q.trim(), mode, limit);
     }
 }

backend-java/src/main/java/com/tasteby/service/SearchService.java

@@ -1,9 +1,12 @@
 package com.tasteby.service;
 
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.tasteby.domain.Restaurant;
 import com.tasteby.mapper.SearchMapper;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 
 import java.util.*;
@@ -12,12 +15,17 @@ import java.util.*;
 public class SearchService {
 
     private static final Logger log = LoggerFactory.getLogger(SearchService.class);
+    private static final ObjectMapper JSON = new ObjectMapper();
+    private static final TypeReference<List<Restaurant>> LIST_TYPE = new TypeReference<>() {};
 
     private final SearchMapper searchMapper;
     private final RestaurantService restaurantService;
     private final VectorService vectorService;
     private final CacheService cache;
 
+    @Value("${app.search.max-distance:0.57}")
+    private double maxDistance;
+
     public SearchService(SearchMapper searchMapper,
                           RestaurantService restaurantService,
                           VectorService vectorService,
@@ -33,8 +41,8 @@ public class SearchService {
         String cached = cache.getRaw(key);
         if (cached != null) {
             try {
-                var mapper = new com.fasterxml.jackson.databind.ObjectMapper();
-                return mapper.readValue(cached, new com.fasterxml.jackson.core.type.TypeReference<List<Restaurant>>() {});
+                // #293 — ObjectMapper 재사용 (필드 static)
+                return JSON.readValue(cached, LIST_TYPE);
             } catch (Exception ignored) {}
         }
 
@@ -44,13 +52,20 @@ public class SearchService {
             case "hybrid" -> {
                 var kw = keywordSearch(q, limit);
                 var sem = semanticSearch(q, limit);
+                // #293 — semantic 결과에도 channels 부착 (이전: keyword에만 부착되어 hybrid에서 sem 결과는 채널 누락)
+                if (!sem.isEmpty()) attachChannels(sem);
                 Set<String> seen = new HashSet<>();
                 var merged = new ArrayList<Restaurant>();
                 for (var r : kw) { if (seen.add(r.getId())) merged.add(r); }
                 for (var r : sem) { if (seen.add(r.getId())) merged.add(r); }
                 result = merged.size() > limit ? merged.subList(0, limit) : merged;
             }
-            default -> result = keywordSearch(q, limit);
+            case "keyword" -> result = keywordSearch(q, limit);
+            default -> {
+                // #293 — 알 수 없는 mode는 silent fallback 대신 경고 로그
+                log.warn("Unknown search mode '{}', falling back to keyword", mode);
+                result = keywordSearch(q, limit);
+            }
         }
 
         cache.set(key, result);
@@ -58,7 +73,10 @@ public class SearchService {
     }
 
     private List<Restaurant> keywordSearch(String q, int limit) {
-        String pattern = "%" + q + "%";
+        // #293 — LIKE 와일드카드 escape: 사용자 입력의 %, _, \ 를 리터럴로 처리.
+        // SQL에서는 ESCAPE '\\' 절을 사용 (SearchMapper.xml).
+        String escaped = q.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_");
+        String pattern = "%" + escaped + "%";
         List<Restaurant> results = searchMapper.keywordSearch(pattern, limit);
         if (!results.isEmpty()) {
             attachChannels(results);
@@ -68,7 +86,7 @@ public class SearchService {
 
     private List<Restaurant> semanticSearch(String q, int limit) {
         try {
-            var similar = vectorService.searchSimilar(q, Math.max(30, limit * 3), 0.57);
+            var similar = vectorService.searchSimilar(q, Math.max(30, limit * 3), maxDistance);
             if (similar.isEmpty()) return List.of();
 
             Set<String> seen = new LinkedHashSet<>();

backend-java/src/main/java/com/tasteby/service/VectorService.java

@@ -27,12 +27,15 @@ public class VectorService {
      */
     public List<Map<String, Object>> searchSimilar(String query, int topK, double maxDistance) {
         List<List<Double>> embeddings = genAi.embedTexts(List.of(query));
-        if (embeddings.isEmpty()) return List.of();
+        // #293 — embeddings 빈/null 가드 (NPE/IndexOutOfBoundsException 방지)
+        if (embeddings == null || embeddings.isEmpty()) return List.of();
+        List<Double> first = embeddings.getFirst();
+        if (first == null || first.isEmpty()) return List.of();
 
         // Convert to float array for Oracle VECTOR type
-        float[] queryVec = new float[embeddings.getFirst().size()];
+        float[] queryVec = new float[first.size()];
         for (int i = 0; i < queryVec.length; i++) {
-            queryVec[i] = embeddings.getFirst().get(i).floatValue();
+            queryVec[i] = first.get(i).floatValue();
         }
 
         String sql = """

backend-java/src/main/resources/application.yml

@@ -59,6 +59,11 @@ app:
   cache:
     ttl-seconds: 600
 
+  search:
+    # #293 — 벡터 검색 cosine distance 임계값 (0.0=완전일치, 1.0=직교).
+    # 0.57은 cohere embed-v4 한국어 시맨틱 적합도 기준 경험값.
+    max-distance: ${SEARCH_MAX_DISTANCE:0.57}
+
   daemon:
     # 인스턴스 차원 스케줄러 활성화. dev/prod가 같은 DB를 공유하므로
     # dev .env에 DAEMON_ENABLED=false를 설정해 dev 폴링을 끄고 prod만 동작시킨다.

backend-java/src/main/resources/mybatis/mapper/SearchMapper.xml

@@ -30,12 +30,13 @@
         JOIN video_restaurants vr ON vr.restaurant_id = r.id
         JOIN videos v ON v.id = vr.video_id
         WHERE r.latitude IS NOT NULL
-          AND (UPPER(r.name) LIKE UPPER(#{query})
-               OR UPPER(r.address) LIKE UPPER(#{query})
-               OR UPPER(r.region) LIKE UPPER(#{query})
-               OR UPPER(r.cuisine_type) LIKE UPPER(#{query})
-               OR UPPER(vr.foods_mentioned) LIKE UPPER(#{query})
-               OR UPPER(v.title) LIKE UPPER(#{query}))
+          <!-- #293 — ESCAPE 절로 사용자 입력의 %, _ 와일드카드 의도 우회 차단 -->
+          AND (UPPER(r.name) LIKE UPPER(#{query}) ESCAPE '\'
+               OR UPPER(r.address) LIKE UPPER(#{query}) ESCAPE '\'
+               OR UPPER(r.region) LIKE UPPER(#{query}) ESCAPE '\'
+               OR UPPER(r.cuisine_type) LIKE UPPER(#{query}) ESCAPE '\'
+               OR UPPER(vr.foods_mentioned) LIKE UPPER(#{query}) ESCAPE '\'
+               OR UPPER(v.title) LIKE UPPER(#{query}) ESCAPE '\')
         FETCH FIRST #{limit} ROWS ONLY
     </select>