[FIX]: AI에러 수정 및 속도 최적화(정확도 떨어짐)

back/.gitignore

@@ -37,7 +37,7 @@ out/
 .vscode/
 
 ### Environment Variables ###
-.env
+../.env
 
 # 테스트 이미지 경로 (LocalStorageServiceTest)
 test-uploads/

back/build.gradle.kts

@@ -47,6 +47,12 @@ dependencies {
     testImplementation("org.springframework.boot:spring-boot-starter-test")
     testImplementation("org.springframework.security:spring-security-test")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+    testImplementation("org.testcontainers:junit-jupiter")
+    testImplementation("org.testcontainers:postgresql")
+    testImplementation("org.springframework.boot:spring-boot-testcontainers")
+    implementation("org.testcontainers:testcontainers")
+    implementation("org.testcontainers:jdbc")
+    implementation("org.testcontainers:postgresql")
 
     // Swagger
     implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.9")
@@ -63,6 +69,7 @@ dependencies {
     // Database
     runtimeOnly("com.h2database:h2")
     runtimeOnly("org.postgresql:postgresql")
+    implementation("org.postgresql:postgresql")
 
     // Migration
      implementation("org.flywaydb:flyway-core:11.11.2")
@@ -78,6 +85,8 @@ dependencies {
     // AI Services - WebFlux for non-blocking HTTP clients
     implementation("org.springframework.boot:spring-boot-starter-webflux")
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+    implementation("io.netty:netty-tcnative-boringssl-static:2.0.65.Final")
+
 
     // AWS SDK for S3
     implementation("software.amazon.awssdk:s3:2.20.+")

back/src/main/java/com/back/domain/scenario/service/ScenarioService.java

@@ -30,6 +30,7 @@
 import org.springframework.transaction.annotation.Transactional;
 
 import java.time.LocalDateTime;
+import java.util.Comparator;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
@@ -163,6 +164,39 @@ protected Long createScenarioInTransaction(
             // lastDecision 처리 (필요 시)
             if (lastDecision != null) {
                 decisionFlowService.createDecisionNodeNext(lastDecision);
+                List<DecisionNode> ordered = decisionNodeRepository.findByDecisionLine_IdOrderByAgeYearAscIdAsc(decisionLine.getId());
+                DecisionNode parent = ordered.isEmpty() ? null : ordered.get(ordered.size() - 1);
+
+                // 베이스 라인의 tail BaseNode 해석(“결말” 우선, 없으면 최대 age)
+                BaseLine baseLine = decisionLine.getBaseLine();
+                List<BaseNode> baseNodes = baseLine.getBaseNodes();
+                BaseNode tailBase = baseNodes.stream()
+                        .filter(b -> {
+                            String s = b.getSituation() == null ? "" : b.getSituation();
+                            String d = b.getDecision()  == null ? "" : b.getDecision();
+                            return s.contains("결말") || d.contains("결말");
+                        })
+                        .max(Comparator.comparingInt(BaseNode::getAgeYear).thenComparingLong(BaseNode::getId))
+                        .orElseGet(() -> baseNodes.stream()
+                                .max(Comparator.comparingInt(BaseNode::getAgeYear).thenComparingLong(BaseNode::getId))
+                                .orElseThrow(() -> new ApiException(ErrorCode.INVALID_INPUT_VALUE, "tail base not found"))
+                        );
+
+                // 엔티티 빌더로 ‘결말’ 결정노드 저장(테일과 동일 age)
+                DecisionNode ending = DecisionNode.builder()
+                        .user(decisionLine.getUser())
+                        .nodeKind(NodeType.DECISION)
+                        .decisionLine(decisionLine)
+                        .baseNode(tailBase)
+                        .parent(parent)
+                        .category(tailBase.getCategory())
+                        .situation("결말")
+                        .decision("결말")
+                        .ageYear(tailBase.getAgeYear())
+                        .background(tailBase.getSituation() == null ? "" : tailBase.getSituation())
+                        .build();
+
+                decisionNodeRepository.save(ending);
             }
 
             // DecisionLine 완료 처리

back/src/main/java/com/back/domain/search/entity/NodeSnippet.java

@@ -0,0 +1,39 @@
+/*
+ * 이 파일은 RAG 검색용 스니펫 엔티티를 정의한다.
+ * 라인/나이/카테고리/텍스트/임베딩을 저장하며 pgvector 컬럼을 float[]로 매핑한다.
+ */
+package com.back.domain.search.entity;
+
+import com.back.infra.pgvector.PgVectorConverter;
+import jakarta.persistence.*;
+import lombok.*;
+import org.hibernate.annotations.JdbcTypeCode;
+import org.hibernate.type.SqlTypes;
+
+@Entity
+@Table(name = "node_snippet")
+@Getter @Setter
+@NoArgsConstructor @AllArgsConstructor @Builder
+public class NodeSnippet {
+
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "line_id", nullable = false)
+    private Long lineId;
+
+    @Column(name = "age_year", nullable = false)
+    private Integer ageYear;
+
+    private String category;
+
+    @Column(name = "text", nullable = false, columnDefinition = "text")
+    private String text;
+
+    @JdbcTypeCode(SqlTypes.OTHER)
+    @Convert(converter = PgVectorConverter.class)
+    @Column(name = "embedding", nullable = false, columnDefinition = "vector(768)")
+    private float[] embedding;
+
+
+}

back/src/main/java/com/back/domain/search/repository/NodeSnippetRepository.java

@@ -0,0 +1,45 @@
+/*
+ * 이 파일은 라인/나이 윈도우로 후보를 좁힌 뒤 pgvector 유사도로 정렬해 topK를 반환하는 네이티브 쿼리를 제공한다.
+ */
+package com.back.domain.search.repository;
+
+import com.back.domain.search.entity.NodeSnippet;
+import org.springframework.data.jpa.repository.*;
+import org.springframework.data.repository.query.Param;
+
+import java.util.List;
+
+public interface NodeSnippetRepository extends JpaRepository<NodeSnippet, Long> {
+
+    // 라인/나이 윈도우 필터 + pgvector 유사도(<=>) 정렬로 상위 K를 조회한다.
+    @Query(value = """
+        SELECT * FROM node_snippet
+         WHERE line_id = :lineId
+           AND age_year BETWEEN :minAge AND :maxAge
+         ORDER BY embedding <=> CAST(:q AS vector)
+         LIMIT :k
+        """, nativeQuery = true)
+    List<NodeSnippet> searchTopKByLineAndAgeWindow(
+            @Param("lineId") Long lineId,
+            @Param("minAge") Integer minAge,
+            @Param("maxAge") Integer maxAge,
+            @Param("q") String vectorLiteral,
+            @Param("k") int k
+    );
+
+    // 텍스트만(가볍게) 가져오기 — 네트워크·파싱 비용 급감
+    @Query(value = """
+        SELECT text FROM node_snippet
+         WHERE line_id = :lineId
+           AND age_year BETWEEN :minAge AND :maxAge
+         ORDER BY embedding <=> CAST(:q AS vector)
+         LIMIT :k
+        """, nativeQuery = true)
+    List<String> searchTopKTextByLineAndAgeWindow(
+            @Param("lineId") Long lineId,
+            @Param("minAge") Integer minAge,
+            @Param("maxAge") Integer maxAge,
+            @Param("q") String vectorLiteral,
+            @Param("k") int k
+    );
+}