refs #739: govern Smilegate few-shot references

2026-07-28 12:17:21 +09:00
parent d932782c9f
commit ae37235258
7 changed files with 331 additions and 14 deletions
--- a/database/adb/82_sgmp_qa_fewshot_reference_governance.sql
+++ b/database/adb/82_sgmp_qa_fewshot_reference_governance.sql
@@ -0,0 +1,219 @@
+-- Governed Few-shot examples for the Smilegate Select AI MCP.
+-- Existing rows are preserved for audit and only APPROVED rows are retrievable.
+
+DECLARE
+  PROCEDURE add_column(p_definition IN VARCHAR2) IS
+  BEGIN
+    EXECUTE IMMEDIATE 'ALTER TABLE sg_qa_vector_example ADD (' || p_definition || ')';
+  EXCEPTION
+    WHEN OTHERS THEN
+      IF SQLCODE != -1430 THEN
+        RAISE;
+      END IF;
+  END;
+BEGIN
+  add_column('reference_status VARCHAR2(16) DEFAULT ''DRAFT'' NOT NULL');
+  add_column('reference_kind VARCHAR2(32) DEFAULT ''SQL_TEMPLATE'' NOT NULL');
+  add_column('target_type VARCHAR2(16) DEFAULT ''ANY'' NOT NULL');
+  add_column('object_role VARCHAR2(64)');
+  add_column('inspection_status VARCHAR2(16) DEFAULT ''PENDING'' NOT NULL');
+  add_column('inspection_note CLOB');
+  add_column('verified_at TIMESTAMP(6)');
+  add_column('verified_by VARCHAR2(128)');
+END;
+/
+
+UPDATE sg_qa_vector_example
+   SET reference_status = 'RETIRED',
+       reference_kind = 'SQL_TEMPLATE',
+       target_type = 'SINGLE',
+       inspection_status = 'RETIRED',
+       inspection_note = 'Executed successfully but maps BUBBLYZ to the CZN physical user-master object. Conflicts with the approved game-target contract.',
+       verified_at = SYSTIMESTAMP,
+       verified_by = 'SGMP_POC_REVIEW'
+ WHERE example_id = 2;
+
+UPDATE sg_qa_vector_example
+   SET reference_status = 'RETIRED',
+       reference_kind = 'OBJECT_UNAVAILABLE',
+       target_type = 'SINGLE',
+       object_role = 'GAME_ALIAS_CATALOG',
+       inspection_status = 'RETIRED',
+       inspection_note = 'Executed successfully with no BUBBLYZ alias rows, but the game literal is not a reusable object-unavailable template. The current game query plan is the authoritative boundary source.',
+       verified_at = SYSTIMESTAMP,
+       verified_by = 'SGMP_POC_REVIEW'
+ WHERE example_id = 3;
+
+UPDATE sg_qa_vector_example
+   SET reference_status = 'APPROVED',
+       reference_kind = 'SQL_TEMPLATE',
+       target_type = 'SINGLE',
+       object_role = 'GAME_USER_MASTER',
+       inspection_status = 'VERIFIED',
+       inspection_note = 'Logical placeholder template. The resolved physical object must come only from the current game query plan.',
+       verified_at = SYSTIMESTAMP,
+       verified_by = 'SGMP_POC_REVIEW'
+ WHERE example_id = 4;
+
+UPDATE sg_qa_vector_example
+   SET reference_status = 'APPROVED',
+       reference_kind = 'NO_TARGET',
+       target_type = 'NONE',
+       inspection_status = 'VERIFIED',
+       inspection_note = 'Executed successfully with no rows. Canonical boundary for an unscoped game-user-master request.',
+       verified_at = SYSTIMESTAMP,
+       verified_by = 'SGMP_POC_REVIEW'
+ WHERE example_id = 5;
+
+UPDATE sg_qa_vector_example
+   SET reference_status = 'RETIRED',
+       reference_kind = 'METADATA_POLICY',
+       target_type = 'ANY',
+       object_role = 'GAME_ALIAS_CATALOG',
+       inspection_status = 'RETIRED',
+       inspection_note = 'Not directly executable: requires an unbound GAME_TERM placeholder. Game resolution is now supplied by game_query_plan.',
+       verified_at = SYSTIMESTAMP,
+       verified_by = 'SGMP_POC_REVIEW'
+ WHERE example_id = 6;
+
+UPDATE sg_qa_vector_example
+   SET reference_status = 'RETIRED',
+       reference_kind = 'SQL_TEMPLATE',
+       target_type = 'NONE',
+       object_role = 'GAME_USER_MASTER',
+       inspection_status = 'RETIRED',
+       inspection_note = 'Executed successfully but chooses CZN_COMN_USER_MST for a game-unscoped question. Conflicts with the NONE target contract.',
+       verified_at = SYSTIMESTAMP,
+       verified_by = 'SGMP_POC_REVIEW'
+ WHERE example_id IN (7, 8);
+
+CREATE OR REPLACE FUNCTION sg_qa_vector_store(
+  p_question   IN CLOB,
+  p_answer_sql IN CLOB,
+  p_answer     IN CLOB DEFAULT NULL
+) RETURN NUMBER
+AUTHID DEFINER
+IS
+  PRAGMA AUTONOMOUS_TRANSACTION;
+  v_input      CLOB;
+  v_embedding  VECTOR;
+  v_example_id NUMBER;
+BEGIN
+  IF p_question IS NULL OR p_answer_sql IS NULL THEN
+    RAISE_APPLICATION_ERROR(-20002, 'question and answer_sql are required.');
+  END IF;
+
+  v_input := TO_CLOB('Question: ') || p_question
+          || TO_CLOB(CHR(10) || 'Answer SQL: ') || p_answer_sql
+          || CASE WHEN p_answer IS NULL THEN NULL ELSE TO_CLOB(CHR(10) || 'Answer: ') || p_answer END;
+  v_embedding := DBMS_VECTOR.UTL_TO_EMBEDDING(
+    v_input,
+    JSON(sg_qa_vector_params('search_document'))
+  );
+
+  INSERT INTO sg_qa_vector_example (
+    question, answer_sql, answer_text, embedding_input, embedding, embedding_model,
+    reference_status, reference_kind, target_type, inspection_status
+  ) VALUES (
+    p_question, p_answer_sql, p_answer, v_input, v_embedding, 'cohere.embed-v4.0',
+    'DRAFT', 'SQL_TEMPLATE', 'ANY', 'PENDING'
+  ) RETURNING example_id INTO v_example_id;
+
+  COMMIT;
+  RETURN v_example_id;
+EXCEPTION
+  WHEN OTHERS THEN
+    ROLLBACK;
+    RAISE;
+END;
+/
+
+CREATE OR REPLACE FUNCTION sg_qa_vector_search(
+  p_question    IN CLOB,
+  p_top_k       IN PLS_INTEGER DEFAULT 3,
+  p_target_type IN VARCHAR2 DEFAULT 'ANY'
+) RETURN SYS_REFCURSOR
+AUTHID DEFINER
+IS
+  v_query_vector VECTOR;
+  v_results      SYS_REFCURSOR;
+  v_target_type  VARCHAR2(16) := UPPER(TRIM(NVL(p_target_type, 'ANY')));
+BEGIN
+  IF p_question IS NULL THEN
+    RAISE_APPLICATION_ERROR(-20003, 'question is required.');
+  END IF;
+  IF p_top_k IS NULL OR p_top_k < 1 OR p_top_k > 20 THEN
+    RAISE_APPLICATION_ERROR(-20004, 'top_k must be between 1 and 20.');
+  END IF;
+  IF v_target_type NOT IN ('NONE', 'SINGLE', 'MULTI', 'ALL', 'ANY') THEN
+    RAISE_APPLICATION_ERROR(-20005, 'target_type must be NONE, SINGLE, MULTI, ALL, or ANY.');
+  END IF;
+
+  v_query_vector := DBMS_VECTOR.UTL_TO_EMBEDDING(
+    p_question,
+    JSON(sg_qa_vector_params('search_query'))
+  );
+
+  OPEN v_results FOR
+    SELECT example_id,
+           question,
+           answer_sql,
+           answer_text,
+           embedding_model,
+           reference_kind,
+           target_type,
+           object_role,
+           vector_distance(embedding, v_query_vector, COSINE) AS cosine_distance
+      FROM sg_qa_vector_example
+     WHERE reference_status = 'APPROVED'
+       AND (target_type = 'ANY' OR v_target_type = 'ANY' OR target_type = v_target_type)
+     ORDER BY vector_distance(embedding, v_query_vector, COSINE), example_id
+     FETCH FIRST p_top_k ROWS ONLY;
+  RETURN v_results;
+END;
+/
+
+CREATE OR REPLACE FUNCTION sg_qa_vector_context(
+  p_question    IN CLOB,
+  p_top_k       IN PLS_INTEGER DEFAULT 3,
+  p_target_type IN VARCHAR2 DEFAULT 'ANY'
+) RETURN CLOB
+AUTHID DEFINER
+IS
+  v_results SYS_REFCURSOR;
+  v_id      NUMBER;
+  v_q       CLOB;
+  v_sql     CLOB;
+  v_answer  CLOB;
+  v_model   VARCHAR2(128);
+  v_kind    VARCHAR2(32);
+  v_target  VARCHAR2(16);
+  v_role    VARCHAR2(64);
+  v_dist    NUMBER;
+  v_context CLOB := EMPTY_CLOB();
+BEGIN
+  v_results := sg_qa_vector_search(p_question, p_top_k, p_target_type);
+  LOOP
+    FETCH v_results INTO v_id, v_q, v_sql, v_answer, v_model, v_kind, v_target, v_role, v_dist;
+    EXIT WHEN v_results%NOTFOUND;
+    v_context := v_context
+      || CASE WHEN DBMS_LOB.GETLENGTH(v_context) = 0 THEN NULL ELSE CHR(10) || CHR(10) END
+      || '[Example ' || v_id || ', kind=' || v_kind || ', target_type=' || v_target
+      || ', cosine_distance=' || TO_CHAR(v_dist, 'FM0D000000') || ']' || CHR(10)
+      || 'Question: ' || v_q || CHR(10)
+      || 'Answer SQL: ' || v_sql
+      || CASE WHEN v_answer IS NULL THEN NULL ELSE CHR(10) || 'Answer: ' || v_answer END;
+  END LOOP;
+  CLOSE v_results;
+  RETURN v_context;
+END;
+/
+
+COMMENT ON COLUMN sg_qa_vector_example.reference_status IS
+  'Few-shot retrieval lifecycle: DRAFT, APPROVED, or RETIRED. Only APPROVED is retrievable.';
+COMMENT ON COLUMN sg_qa_vector_example.reference_kind IS
+  'Few-shot semantic kind: SQL_TEMPLATE, NO_TARGET, OBJECT_UNAVAILABLE, or METADATA_POLICY.';
+COMMENT ON COLUMN sg_qa_vector_example.target_type IS
+  'Applicable game query-plan target type: NONE, SINGLE, MULTI, ALL, or ANY.';
+COMMENT ON COLUMN sg_qa_vector_example.object_role IS
+  'Logical object role; physical object names must be sourced from the current game query plan.';
--- a/docs/design/739-game-target-contract/README.md
+++ b/docs/design/739-game-target-contract/README.md
@@ -116,7 +116,32 @@ system prompt와 MCP 도구 설명으로 다음 절차를 안내한다.
 - 생성 SQL에서 `NONE`의 prefix 전용 객체 차단 확인
 - 운영 서비스 health와 Portal ReAct 실제 응답 확인

-## 8. 변경 이력
+## 8. Few-shot 참조 거버넌스
+
+Few-shot 원문 SQL은 실행 이력 그대로 검색하지 않는다. 특히 특정 게임의 물리 객체명이
+포함된 예제는 다른 게임 또는 게임 미지정 질의의 벡터 후보가 될 수 있으므로, 예제는
+검증·정규화·승인 단계를 거쳐야 한다.
+
+`SG_QA_VECTOR_EXAMPLE`에는 다음 참조 메타데이터를 둔다.
+
+| 필드 | 내용 |
+|---|---|
+| `REFERENCE_STATUS` | `DRAFT`, `APPROVED`, `RETIRED`. 검색은 `APPROVED`만 사용한다. |
+| `REFERENCE_KIND` | `SQL_TEMPLATE`, `NO_TARGET`, `OBJECT_UNAVAILABLE`, `METADATA_POLICY` |
+| `TARGET_TYPE` | `NONE`, `SINGLE`, `MULTI`, `ALL`, `ANY`. 현재 game query plan과 일치하는 예제만 벡터 순위에 포함한다. |
+| `OBJECT_ROLE` | 물리 테이블명이 아닌 `GAME_USER_MASTER` 등 논리 객체 역할 |
+| `INSPECTION_STATUS`, `INSPECTION_NOTE` | 전수 실행·정책 검토 결과와 사유 |
+| `VERIFIED_AT`, `VERIFIED_BY` | 승인 감사 이력 |
+
+물리 테이블명은 Few-shot의 의미 규칙으로 저장하지 않는다. `SQL_TEMPLATE`은
+`<RESOLVED_GAME_USER_MASTER>` 같은 논리 placeholder를 사용하며, 실제 객체는 오직
+현재 `queryPlan.targets[*].userMasterObjectName`에서만 해석한다. `NO_TARGET`과
+`OBJECT_UNAVAILABLE` 예제는 SQL 패턴이 아니라 범위 경계 안내로 프롬프트에 포함한다.
+
+기존 예제는 삭제하지 않는다. 실행 가능성, 게임 범위 일치, 물리 객체 의존성을 전수
+검사해 `RETIRED`로 분리하고, 검증된 정규화 예제만 `APPROVED`로 전환한다.
+
+## 9. 변경 이력

 - Redmine: `#739`
 - Backoffice branch: `smilegate`
--- a/vpd-backoffice/src/main/java/com/cloudhandson/vpdbackoffice/service/McpSseService.java
+++ b/vpd-backoffice/src/main/java/com/cloudhandson/vpdbackoffice/service/McpSseService.java
@@ -255,6 +255,11 @@ public class McpSseService {
        item.put("answer", example.answer());
      }
      item.put("embeddingModel", example.embeddingModel());
+      item.put("referenceKind", example.referenceKind());
+      item.put("targetType", example.targetType());
+      if (example.objectRole() != null) {
+        item.put("objectRole", example.objectRole());
+      }
      item.put("cosineDistance", example.cosineDistance());
    }
    return response;
@@ -267,6 +272,8 @@ public class McpSseService {
    response.put("exampleId", stored.exampleId());
    response.put("question", stored.question());
    response.put("embeddingModel", stored.embeddingModel());
+    response.put("referenceStatus", stored.referenceStatus());
+    response.put("nextStep", "DRAFT 예제입니다. 실행·정책 검토 후 APPROVED로 전환해야 Few-shot 검색에 사용됩니다.");
    return response;
  }

--- a/vpd-backoffice/src/main/java/com/cloudhandson/vpdbackoffice/service/QaVectorService.java
+++ b/vpd-backoffice/src/main/java/com/cloudhandson/vpdbackoffice/service/QaVectorService.java
@@ -44,20 +44,28 @@ public class QaVectorService {
  }

  public VectorSearchResult search(String bearerToken, String question, int topK) {
+    return search(bearerToken, question, topK, "ANY");
+  }
+
+  /** Searches only approved examples compatible with the current game target contract. */
+  public VectorSearchResult search(
+      String bearerToken, String question, int topK, String targetType) {
    requireActiveToken(bearerToken);
    String normalizedQuestion = requiredText(question, "question", MAX_QUESTION_LENGTH);
    if (topK < 1 || topK > 20) {
      throw new AppException("topK는 1에서 20 사이여야 합니다.");
    }
+    String normalizedTargetType = requiredTargetType(targetType);
    BackofficeProperties.SelectAi selectAi = requiredSelectAi();

    List<VectorExample> examples = new ArrayList<>();
    try (Connection connection = DriverManager.getConnection(
        selectAi.dbUrl(), selectAi.dbUsername(), selectAi.dbPassword());
-         CallableStatement statement = connection.prepareCall("{ ? = call sg_qa_vector_search(?, ?) }")) {
+         CallableStatement statement = connection.prepareCall("{ ? = call sg_qa_vector_search(?, ?, ?) }")) {
      statement.registerOutParameter(1, Types.REF_CURSOR);
      statement.setString(2, normalizedQuestion);
      statement.setInt(3, topK);
+      statement.setString(4, normalizedTargetType);
      statement.execute();
      try (ResultSet resultSet = (ResultSet) statement.getObject(1)) {
        while (resultSet.next()) {
@@ -67,6 +75,9 @@ public class QaVectorService {
              resultSet.getString("ANSWER_SQL"),
              resultSet.getString("ANSWER_TEXT"),
              resultSet.getString("EMBEDDING_MODEL"),
+              resultSet.getString("REFERENCE_KIND"),
+              resultSet.getString("TARGET_TYPE"),
+              resultSet.getString("OBJECT_ROLE"),
              resultSet.getDouble("COSINE_DISTANCE")
          ));
        }
@@ -96,7 +107,7 @@ public class QaVectorService {
          throw new AppException("QA 벡터 예제 SQL 저장 결과가 없습니다.");
        }
        return new VectorStoreResult(
-            resultSet.getLong("EXAMPLE_ID"), normalizedQuestion, "cohere.embed-v4.0");
+            resultSet.getLong("EXAMPLE_ID"), normalizedQuestion, "cohere.embed-v4.0", "DRAFT");
      }
    } catch (AppException exception) {
      throw exception;
@@ -145,6 +156,14 @@ public class QaVectorService {
    return normalized;
  }

+  private String requiredTargetType(String value) {
+    String normalized = value == null ? "ANY" : value.trim().toUpperCase();
+    if (!List.of("NONE", "SINGLE", "MULTI", "ALL", "ANY").contains(normalized)) {
+      throw new AppException("targetType은 NONE, SINGLE, MULTI, ALL, ANY 중 하나여야 합니다.");
+    }
+    return normalized;
+  }
+
  private String optionalText(String value, String fieldName, int maximumLength) {
    String normalized = value == null ? "" : value.trim();
    if (normalized.isEmpty()) {
@@ -162,6 +181,9 @@ public class QaVectorService {
      String answerSql,
      String answer,
      String embeddingModel,
+      String referenceKind,
+      String targetType,
+      String objectRole,
      double cosineDistance
  ) {
  }
@@ -169,6 +191,7 @@ public class QaVectorService {
  public record VectorSearchResult(String question, int topK, List<VectorExample> examples) {
  }

-  public record VectorStoreResult(long exampleId, String question, String embeddingModel) {
+  public record VectorStoreResult(
+      long exampleId, String question, String embeddingModel, String referenceStatus) {
  }
 }
--- a/vpd-backoffice/src/main/java/com/cloudhandson/vpdbackoffice/service/SelectAiService.java
+++ b/vpd-backoffice/src/main/java/com/cloudhandson/vpdbackoffice/service/SelectAiService.java
@@ -142,7 +142,7 @@ public class SelectAiService {
      QueryPlanContext queryPlan
  ) {
    EnrichedPrompt enrichedPrompt = enrichWithFewShot(
-        bearerToken, selectAi, executionPrompt);
+        bearerToken, selectAi, executionPrompt, queryPlan == null ? "ANY" : queryPlan.targetType());
    String generatedSql = generate(selectAi, enrichedPrompt.prompt(), "showsql");
    String normalizedSql = validateReadOnlySql(generatedSql);
    if (allowedPrefixes != null && gameScopeService != null
@@ -287,6 +287,11 @@ public class SelectAiService {
        item.put("answer", example.answer());
      }
      item.put("embeddingModel", example.embeddingModel());
+      item.put("referenceKind", example.referenceKind());
+      item.put("targetType", example.targetType());
+      if (example.objectRole() != null) {
+        item.put("objectRole", example.objectRole());
+      }
      item.put("cosineDistance", example.cosineDistance());
    }
  }
@@ -296,7 +301,7 @@ public class SelectAiService {
    requireActiveToken(bearerToken);
    String normalizedPrompt = requiredPrompt(prompt);
    BackofficeProperties.SelectAi selectAi = requiredSelectAi();
-    EnrichedPrompt enrichedPrompt = enrichWithFewShot(bearerToken, selectAi, normalizedPrompt);
+    EnrichedPrompt enrichedPrompt = enrichWithFewShot(bearerToken, selectAi, normalizedPrompt, "ANY");
    String selectAiPrompt = generate(selectAi, enrichedPrompt.prompt(), "showprompt");

    ObjectNode response = objectMapper.createObjectNode();
@@ -370,14 +375,15 @@ public class SelectAiService {
  private EnrichedPrompt enrichWithFewShot(
      String bearerToken,
      BackofficeProperties.SelectAi selectAi,
-      String prompt
+      String prompt,
+      String targetType
  ) {
    if (!fewShotEnabled(selectAi) || qaVectorService == null) {
      return new EnrichedPrompt(prompt, "DISABLED", 0, List.of());
    }
    try {
      List<QaVectorService.VectorExample> examples = qaVectorService
-          .search(bearerToken, prompt, fewShotTopK(selectAi))
+          .search(bearerToken, prompt, fewShotTopK(selectAi), targetType)
          .examples();
      if (examples.isEmpty()) {
        return new EnrichedPrompt(composePolicyPrompt(prompt), "NO_MATCH", 0, List.of());
@@ -412,12 +418,10 @@ public class SelectAiService {
      if (included >= MAX_FEW_SHOT_EXAMPLES) {
        break;
      }
-      String answerSql = truncate(example.answerSql(), MAX_FEW_SHOT_SQL_CHARS);
-      if (answerSql.isBlank()) {
+      String candidate = referenceCandidate(included + 1, example);
+      if (candidate.isBlank()) {
        continue;
      }
-      String candidate = "Example " + (included + 1) + " question:\n" + example.question()
-          + "\nExample " + (included + 1) + " verified SQL:\n" + answerSql + "\n\n";
      if (enriched.length() + candidate.length() + prompt.length() > MAX_ENRICHED_PROMPT_LENGTH) {
        break;
      }
@@ -430,6 +434,19 @@ public class SelectAiService {
    return enriched.append("Original user question:\n").append(prompt).toString();
  }

+  private static String referenceCandidate(int index, QaVectorService.VectorExample example) {
+    String prefix = "Example " + index + " question:\n" + example.question()
+        + "\nExample " + index + " target type: " + example.targetType()
+        + "\nExample " + index + " reference kind: " + example.referenceKind() + "\n";
+    if ("NO_TARGET".equals(example.referenceKind())
+        || "OBJECT_UNAVAILABLE".equals(example.referenceKind())) {
+      String boundary = truncate(example.answer(), MAX_FEW_SHOT_SQL_CHARS);
+      return boundary.isBlank() ? "" : prefix + "Boundary outcome:\n" + boundary + "\n\n";
+    }
+    String answerSql = truncate(example.answerSql(), MAX_FEW_SHOT_SQL_CHARS);
+    return answerSql.isBlank() ? "" : prefix + "Verified SQL template:\n" + answerSql + "\n\n";
+  }
+
  private static String truncate(String value, int maxLength) {
    String normalized = value == null ? "" : value.trim();
    return normalized.length() <= maxLength ? normalized : normalized.substring(0, maxLength);
--- a/vpd-backoffice/src/test/java/com/cloudhandson/vpdbackoffice/service/McpSseServiceTest.java
+++ b/vpd-backoffice/src/test/java/com/cloudhandson/vpdbackoffice/service/McpSseServiceTest.java
@@ -363,7 +363,7 @@ class McpSseServiceTest {
      this.topK = topK;
      return new VectorSearchResult(question, topK, java.util.List.of(new VectorExample(
          42L, "active user count", "SELECT COUNT(*) FROM APP_USER", "AU count",
-          "cohere.embed-v4.0", 0.12
+          "cohere.embed-v4.0", "SQL_TEMPLATE", "ANY", null, 0.12
      )));
    }

@@ -372,7 +372,7 @@ class McpSseServiceTest {
      this.bearerToken = bearerToken;
      this.question = question;
      this.answerSql = answerSql;
-      return new VectorStoreResult(77L, question, "cohere.embed-v4.0");
+      return new VectorStoreResult(77L, question, "cohere.embed-v4.0", "DRAFT");
    }
  }

--- a/vpd-backoffice/src/test/java/com/cloudhandson/vpdbackoffice/service/SelectAiFewShotPromptTest.java
+++ b/vpd-backoffice/src/test/java/com/cloudhandson/vpdbackoffice/service/SelectAiFewShotPromptTest.java
@@ -17,6 +17,9 @@ class SelectAiFewShotPromptTest {
            "SELECT COUNT(*) AS AU_COUNT FROM APP_USER",
            "AU count",
            "cohere.embed-v4.0",
+            "SQL_TEMPLATE",
+            "SINGLE",
+            "GAME_USER_MASTER",
            0.01
        ))
    );
@@ -29,4 +32,27 @@ class SelectAiFewShotPromptTest {
        .contains("do not infer a default game")
        .contains("Continue a game-neutral question with approved common objects");
  }
+
+  @Test
+  void rendersNoTargetExamplesAsBoundaryRatherThanSqlPattern() {
+    String prompt = SelectAiService.composeFewShotPrompt(
+        "common user count without a game",
+        List.of(new QaVectorService.VectorExample(
+            5L,
+            "common user count without a game",
+            "SELECT CAST(NULL AS NUMBER) FROM DUAL WHERE 1 = 0",
+            "Do not select a game-scoped object when the target plan is NONE.",
+            "cohere.embed-v4.0",
+            "NO_TARGET",
+            "NONE",
+            null,
+            0.01
+        ))
+    );
+
+    assertThat(prompt)
+        .contains("Boundary outcome")
+        .contains("Do not select a game-scoped object")
+        .doesNotContain("SELECT CAST(NULL AS NUMBER)");
+  }
 }