feat(hub): W3-4 메인 허브 keyset 페이징 + 진행중 잼 배너 (단계1+2 통합)

- keyset 페이징: GamesMapper.listVisibleKeyset/searchVisibleKeyset 신규 — 커서 (sort_order,created_at,id) 3-튜플 OR 분해(혼합방향 ASC/DESC/DESC), LIMIT #{limit}, #{} only. 기존 getVisibleGames/searchVisibleGames 보존(회귀 0)
- WebMvcController: cursor 파라미터 + nextCursor 산정 + parseCursor/encodeCursor(형식오류→첫페이지 폴백, throw 0) + HubCursor record + HUB_PAGE_SIZE=24. 검색/비검색 동일 커서 규약(공통 헬퍼)
- 진행중 잼 배너(단계2): JamsMapper.listActive/countActive 신규(status IN RECRUIT/DEV/EVAL, is_visible). 최신 1건 + "외 N-1개" 라벨, N=0 미렌더. CTA → W3-1 /games/search?jam={slug}
- index.jsp: 더보기 링크(hasNextPage, q+cursor URLEncoder) + 잼 배너(title HtmlUtils.htmlEscape, slug URLEncoder). 기존 렌더루프+W3-1 태그 UI 보존
- docs/games-hub-ddl.sql: idx_games_visible_keyset 멱등(games 컬럼 0변경) + schema.sql 동기
- BibimbapApplicationTests 무변경(JamsMapper/GamesMapper @MockBean W2-1 기등록 재사용)

검증: 컨테이너 ./mvnw -o test 243/243 GREEN(신규 8: WebMvcControllerTest), 회귀 0. L2 격리 throwaway DB contract PASS(혼합방향 keyset 경계 무중복/무누락·동일 sort_order/created_at tie-break·검색 keyset·잼 status 필터). 정렬키 5곳 동일·${} 0. 실 dev DB 무접촉.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K3FeMrbtxfTScjrwUukyHD

db/schema.sql

@@ -105,6 +105,9 @@ ALTER SEQUENCE "games_id_seq" OWNED BY "games"."id";
 CREATE INDEX IF NOT EXISTS "idx_games_visible_order"
     ON "games" ("is_visible", "is_delete", "sort_order", "created_at" DESC, "id" DESC);
 
+CREATE INDEX IF NOT EXISTS "idx_games_visible_keyset"
+    ON "games" ("is_visible", "is_delete", "sort_order" ASC, "created_at" DESC, "id" DESC);
+
 -- ---------------------------------------------------------------------------
 -- game_comments  (비권위 복원본 — 매퍼 존재하나 컨트롤러 미연결)
 -- ---------------------------------------------------------------------------

docs/games-hub-ddl.sql

@@ -0,0 +1,7 @@
+-- W3-4 게임 허브 keyset 페이징 성능 인덱스. games 컬럼 변경 0(인덱스만). 멱등.
+-- db/apply-local-ddl.sh 글롭 docs/*-ddl.sql 자동 적용 + db/schema.sql 동기 사본.
+
+-- 정렬키 = sort_order ASC, created_at DESC, id DESC (GamesMapper.getVisibleGames 와 동일)
+-- 인덱스 없이도 keyset 정합은 WHERE 비교가 보장하며, 인덱스는 깊은 페이지/대량 seek 최적화용이다.
+CREATE INDEX IF NOT EXISTS "idx_games_visible_keyset"
+    ON "games" ("is_visible", "is_delete", "sort_order" ASC, "created_at" DESC, "id" DESC);

src/main/java/com/pandoli365/bibimbap/controller/WebMvcController.java

@@ -1,6 +1,9 @@
 package com.pandoli365.bibimbap.controller;
 
+import com.pandoli365.bibimbap.data.GameData;
+import com.pandoli365.bibimbap.data.JamData;
 import com.pandoli365.bibimbap.mapper.GamesMapper;
+import com.pandoli365.bibimbap.mapper.JamsMapper;
 import jakarta.servlet.RequestDispatcher;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpSession;
@@ -13,6 +16,10 @@ import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
@@ -20,10 +27,14 @@ import java.util.List;
 @Controller
 public class WebMvcController implements WebMvcConfigurer, ErrorController {
 
-    private final GamesMapper gamesMapper;
+    private static final int HUB_PAGE_SIZE = 24;
 
-    public WebMvcController(GamesMapper gamesMapper) {
+    private final GamesMapper gamesMapper;
+    private final JamsMapper jamsMapper;
+
+    public WebMvcController(GamesMapper gamesMapper, JamsMapper jamsMapper) {
         this.gamesMapper = gamesMapper;
+        this.jamsMapper = jamsMapper;
     }
 
     @RequestMapping("/error")
@@ -50,8 +61,9 @@ public class WebMvcController implements WebMvcConfigurer, ErrorController {
     }
 
     @GetMapping("/")
-    public ModelAndView indexView(@RequestParam(name = "q", required = false) String query) {
+    public ModelAndView indexView(@RequestParam(name = "q", required = false) String query,
-        return indexModelAndView(query);
+                                  @RequestParam(name = "cursor", required = false) String cursor) {
+        return indexModelAndView(query, cursor);
     }
 
     @GetMapping("/{pageName}")
@@ -95,22 +107,80 @@ public class WebMvcController implements WebMvcConfigurer, ErrorController {
                 mv.setViewName("operation-policy");
                 break;
             default:
-                return indexModelAndView(query);
+                return indexModelAndView(query, null);
         }
 
         return mv;
     }
 
-    private ModelAndView indexModelAndView(String query) {
+    private ModelAndView indexModelAndView(String query, String cursor) {
         String normalizedQuery = query == null ? "" : query.trim();
+        HubCursor parsed = parseCursor(cursor);   // null = 첫 페이지
+        Integer cSort = parsed == null ? null : parsed.sortOrder();
+        OffsetDateTime cCreated = parsed == null ? null : parsed.createdAt();
+        Long cId = parsed == null ? null : parsed.id();
+
+        List<GameData> rows = normalizedQuery.isBlank()
+                ? gamesMapper.listVisibleKeyset(cSort, cCreated, cId, HUB_PAGE_SIZE + 1)
+                : gamesMapper.searchVisibleKeyset(normalizedQuery, cSort, cCreated, cId, HUB_PAGE_SIZE + 1);
+
+        String nextCursor = null;
+        if (rows.size() > HUB_PAGE_SIZE) {
+            rows = new ArrayList<>(rows.subList(0, HUB_PAGE_SIZE));
+            GameData last = rows.get(HUB_PAGE_SIZE - 1);
+            nextCursor = encodeCursor(last);
+        }
+
         ModelAndView mv = new ModelAndView("index");
-        mv.addObject("games", normalizedQuery.isBlank()
+        mv.addObject("games", rows);
-                ? gamesMapper.getVisibleGames()
-                : gamesMapper.searchVisibleGames(normalizedQuery));
         mv.addObject("searchQuery", normalizedQuery);
+        mv.addObject("nextCursor", nextCursor);   // nullable — JSP 가 null 시 더보기 미표시
+
+        // 진행중 잼 배너 (activeCount==0 → attr 미주입 → 배너 미렌더)
+        int activeCount = jamsMapper.countActive();
+        if (activeCount > 0) {
+            List<JamData> active = jamsMapper.listActive(1);
+            if (!active.isEmpty()) {
+                mv.addObject("activeJam", active.get(0));
+                mv.addObject("activeJamCount", activeCount);
+            }
+        }
         return mv;
     }
 
+    private String encodeCursor(GameData last) {
+        if (last == null || last.getSortOrder() == null
+                || last.getCreatedAt() == null || last.getId() == null) {
+            return null;
+        }
+        return last.getSortOrder() + "_"
+                + last.getCreatedAt().toInstant().toEpochMilli() + "_"
+                + last.getId();
+    }
+
+    // "10_1718000000000_57" → HubCursor | null. 사용자 입력 신뢰 금지 — 형식오류는 첫 페이지 폴백.
+    private HubCursor parseCursor(String cursor) {
+        if (cursor == null || cursor.isBlank()) {
+            return null;
+        }
+        String[] parts = cursor.split("_");
+        if (parts.length != 3) {
+            return null;
+        }
+        try {
+            int sortOrder = Integer.parseInt(parts[0]);
+            long millis = Long.parseLong(parts[1]);
+            long id = Long.parseLong(parts[2]);
+            OffsetDateTime createdAt = OffsetDateTime.ofInstant(
+                    Instant.ofEpochMilli(millis), ZoneOffset.UTC);
+            return new HubCursor(sortOrder, createdAt, id);
+        } catch (NumberFormatException e) {
+            return null;
+        }
+    }
+
+    private record HubCursor(Integer sortOrder, OffsetDateTime createdAt, Long id) {}
+
     private boolean isLoggedIn(HttpSession session) {
         return session != null && session.getAttribute("userId") != null;
     }

src/main/java/com/pandoli365/bibimbap/mapper/GamesMapper.java

@@ -260,4 +260,84 @@ public interface GamesMapper {
             </script>
             """)
     List<GameData> searchGamesAdvanced(SearchCriteria c);
+
+    @Select("""
+            <script>
+            SELECT
+                g.id,
+                g.user_id AS userId,
+                g.name,
+                u.display_name AS creator,
+                g.creator_note AS creatorNote,
+                g.git_url AS gitUrl,
+                g.webgl_path AS webglPath,
+                g.thumbnail_url AS thumbnailUrl,
+                g.like_count AS likeCount,
+                g.is_visible AS visible,
+                g.sort_order AS sortOrder,
+                g.created_at AS createdAt,
+                g.updated_at AS updatedAt
+            FROM games g
+            JOIN users u ON u.id = g.user_id
+            WHERE g.is_visible IS NOT FALSE
+              AND g.is_delete IS NOT TRUE
+              AND u.is_delete IS NOT TRUE
+            <if test="cursorSortOrder != null and cursorCreatedAt != null and cursorId != null">
+              AND (
+                  g.sort_order &gt; #{cursorSortOrder}
+                  OR (g.sort_order = #{cursorSortOrder} AND g.created_at &lt; #{cursorCreatedAt})
+                  OR (g.sort_order = #{cursorSortOrder} AND g.created_at = #{cursorCreatedAt} AND g.id &lt; #{cursorId})
+              )
+            </if>
+            ORDER BY g.sort_order ASC, g.created_at DESC, g.id DESC
+            LIMIT #{limit}
+            </script>
+            """)
+    List<GameData> listVisibleKeyset(@Param("cursorSortOrder") Integer cursorSortOrder,
+                                     @Param("cursorCreatedAt") java.time.OffsetDateTime cursorCreatedAt,
+                                     @Param("cursorId") Long cursorId,
+                                     @Param("limit") int limit);
+
+    @Select("""
+            <script>
+            SELECT
+                g.id,
+                g.user_id AS userId,
+                g.name,
+                u.display_name AS creator,
+                g.creator_note AS creatorNote,
+                g.git_url AS gitUrl,
+                g.webgl_path AS webglPath,
+                g.thumbnail_url AS thumbnailUrl,
+                g.like_count AS likeCount,
+                g.is_visible AS visible,
+                g.sort_order AS sortOrder,
+                g.created_at AS createdAt,
+                g.updated_at AS updatedAt
+            FROM games g
+            JOIN users u ON u.id = g.user_id
+            WHERE g.is_visible IS NOT FALSE
+              AND g.is_delete IS NOT TRUE
+              AND u.is_delete IS NOT TRUE
+              AND (
+                  g.name ILIKE CONCAT('%', #{query}, '%')
+                  OR u.display_name ILIKE CONCAT('%', #{query}, '%')
+                  OR g.creator_note ILIKE CONCAT('%', #{query}, '%')
+              )
+            <if test="cursorSortOrder != null and cursorCreatedAt != null and cursorId != null">
+              AND (
+                  g.sort_order &gt; #{cursorSortOrder}
+                  OR (g.sort_order = #{cursorSortOrder} AND g.created_at &lt; #{cursorCreatedAt})
+                  OR (g.sort_order = #{cursorSortOrder} AND g.created_at = #{cursorCreatedAt} AND g.id &lt; #{cursorId})
+              )
+            </if>
+            ORDER BY g.sort_order ASC, g.created_at DESC, g.id DESC
+            LIMIT #{limit}
+            </script>
+            """)
+    List<GameData> searchVisibleKeyset(@Param("query") String query,
+                                       @Param("cursorSortOrder") Integer cursorSortOrder,
+                                       @Param("cursorCreatedAt") java.time.OffsetDateTime cursorCreatedAt,
+                                       @Param("cursorId") Long cursorId,
+                                       @Param("limit") int limit);
 }

src/main/java/com/pandoli365/bibimbap/mapper/JamsMapper.java

@@ -181,4 +181,36 @@ public interface JamsMapper {
               AND is_delete IS NOT TRUE
             """)
     int softDelete(long jamId);
+
+    @Select("""
+            SELECT id, slug, title, description, status,
+                   recruit_start_at AS recruitStartAt,
+                   dev_start_at AS devStartAt,
+                   eval_start_at AS evalStartAt,
+                   eval_end_at AS evalEndAt,
+                   discord_url AS discordUrl,
+                   prize_info AS prizeInfo,
+                   sponsor_info AS sponsorInfo,
+                   is_visible AS isVisible,
+                   created_by AS createdBy,
+                   created_at AS createdAt,
+                   updated_at AS updatedAt,
+                   is_delete AS isDelete
+            FROM jams
+            WHERE status IN ('RECRUIT', 'DEV', 'EVAL')
+              AND is_visible IS NOT FALSE
+              AND is_delete IS NOT TRUE
+            ORDER BY created_at DESC, id DESC
+            LIMIT #{limit}
+            """)
+    List<JamData> listActive(@Param("limit") int limit);
+
+    @Select("""
+            SELECT COUNT(*)
+            FROM jams
+            WHERE status IN ('RECRUIT', 'DEV', 'EVAL')
+              AND is_visible IS NOT FALSE
+              AND is_delete IS NOT TRUE
+            """)
+    int countActive();
 }

src/main/webapp/WEB-INF/views/index.jsp

@@ -66,6 +66,25 @@
             }
         }
     }
+
+    String nextCursor = "";
+    Object nextCursorAttr = request.getAttribute("nextCursor");
+    if (nextCursorAttr instanceof String) {
+        nextCursor = ((String) nextCursorAttr).trim();
+    }
+    boolean hasNextPage = !nextCursor.isBlank();
+
+    com.pandoli365.bibimbap.data.JamData activeJam = null;
+    Object activeJamAttr = request.getAttribute("activeJam");
+    if (activeJamAttr instanceof com.pandoli365.bibimbap.data.JamData) {
+        activeJam = (com.pandoli365.bibimbap.data.JamData) activeJamAttr;
+    }
+    int activeJamCount = 0;
+    Object activeJamCountAttr = request.getAttribute("activeJamCount");
+    if (activeJamCountAttr instanceof Integer) {
+        activeJamCount = (Integer) activeJamCountAttr;
+    }
+    boolean showJamBanner = activeJamCount > 0 && activeJam != null && activeJam.getSlug() != null && !activeJam.getSlug().isBlank();
 %>
 <!DOCTYPE html>
 <html lang="ko">
@@ -585,6 +604,83 @@
         text-align: center;
         line-height: 1.6;
       }
+      .jam-banner {
+        width: min(100%, 48rem);
+        margin: 0 auto 1.25rem;
+      }
+      .jam-banner__link {
+        display: flex;
+        align-items: center;
+        gap: 0.75rem;
+        padding: 0.875rem 1rem;
+        border: 1px solid rgba(232, 165, 75, 0.4);
+        border-radius: 12px;
+        background: var(--card-bg);
+        box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
+        text-decoration: none;
+        color: var(--text);
+      }
+      .jam-banner__link:hover {
+        border-color: rgba(232, 165, 75, 0.7);
+        box-shadow: 0 6px 16px var(--card-shadow);
+      }
+      .jam-banner__badge {
+        flex-shrink: 0;
+        padding: 0.25rem 0.55rem;
+        font-size: 0.6875rem;
+        font-weight: 800;
+        color: #1a1a1a;
+        background: var(--accent);
+        border-radius: 6px;
+      }
+      .jam-banner__text {
+        flex: 1;
+        min-width: 0;
+        display: flex;
+        flex-direction: column;
+        gap: 0.15rem;
+      }
+      .jam-banner__title {
+        font-size: 0.9375rem;
+        font-weight: 700;
+        line-height: 1.3;
+        overflow: hidden;
+        text-overflow: ellipsis;
+        white-space: nowrap;
+      }
+      .jam-banner__meta {
+        font-size: 0.75rem;
+        color: var(--text-muted);
+      }
+      .jam-banner__arrow {
+        flex-shrink: 0;
+        font-size: 1.1rem;
+        color: var(--accent);
+      }
+      .hub-more {
+        display: flex;
+        justify-content: center;
+        margin-top: 1.5rem;
+      }
+      .hub-more__link {
+        min-height: 3rem;
+        padding: 0 1.5rem;
+        display: inline-flex;
+        align-items: center;
+        justify-content: center;
+        border: 1px solid var(--border);
+        border-radius: 12px;
+        background: var(--card-bg);
+        color: var(--text);
+        font-size: 0.9375rem;
+        font-weight: 700;
+        text-decoration: none;
+        box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
+      }
+      .hub-more__link:hover {
+        border-color: rgba(232, 165, 75, 0.5);
+        box-shadow: 0 6px 16px var(--card-shadow);
+      }
     </style>
 </head>
 <body>
@@ -670,6 +766,23 @@
             </div>
         </section>
 
+        <% if (showJamBanner) {
+            String jamTitle = HtmlUtils.htmlEscape(activeJam.getTitle() == null || activeJam.getTitle().isBlank() ? "게임잼" : activeJam.getTitle());
+            String jamSlugParam = java.net.URLEncoder.encode(activeJam.getSlug(), java.nio.charset.StandardCharsets.UTF_8);
+            String jamCountLabel = activeJamCount > 1 ? ("외 " + (activeJamCount - 1) + "개 진행 중") : "진행 중";
+        %>
+        <section class="jam-banner" aria-label="진행 중인 게임잼">
+            <a class="jam-banner__link" href="<%= ctx %>/games/search?jam=<%= jamSlugParam %>">
+                <span class="jam-banner__badge">게임잼</span>
+                <span class="jam-banner__text">
+                    <strong class="jam-banner__title"><%= jamTitle %></strong>
+                    <span class="jam-banner__meta"><%= jamCountLabel %> · 출품작 보러가기</span>
+                </span>
+                <span class="jam-banner__arrow" aria-hidden="true">&rarr;</span>
+            </a>
+        </section>
+        <% } %>
+
         <section class="card-grid" aria-label="추천 목록">
             <% if (games.isEmpty()) { %>
             <% if (searching) { %>
@@ -717,6 +830,18 @@
                 }
             %>
         </section>
+
+        <% if (hasNextPage) {
+            String moreHref = ctx + "/?";
+            if (searching) {
+                moreHref += "q=" + java.net.URLEncoder.encode(searchQuery, java.nio.charset.StandardCharsets.UTF_8) + "&";
+            }
+            moreHref += "cursor=" + java.net.URLEncoder.encode(nextCursor, java.nio.charset.StandardCharsets.UTF_8);
+        %>
+        <nav class="hub-more" aria-label="더 많은 게임">
+            <a class="hub-more__link" href="<%= moreHref %>">더 보기</a>
+        </nav>
+        <% } %>
     </main>
     <jsp:include page="/WEB-INF/views/footer.jsp"/>
     <script>

src/test/java/com/pandoli365/bibimbap/controller/WebMvcControllerTest.java

@@ -0,0 +1,206 @@
+package com.pandoli365.bibimbap.controller;
+
+import com.pandoli365.bibimbap.data.GameData;
+import com.pandoli365.bibimbap.data.JamData;
+import com.pandoli365.bibimbap.mapper.GamesMapper;
+import com.pandoli365.bibimbap.mapper.JamsMapper;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.web.servlet.ModelAndView;
+
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.ArgumentMatchers.isNull;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+class WebMvcControllerTest {
+
+    private static final int HUB_PAGE_SIZE = 24;
+    private static final int FETCH_LIMIT = HUB_PAGE_SIZE + 1;
+
+    @Mock
+    private GamesMapper gamesMapper;
+
+    @Mock
+    private JamsMapper jamsMapper;
+
+    @Test
+    void firstPage_returnsPageSizeAndNextCursor() {
+        when(jamsMapper.countActive()).thenReturn(0);
+        when(gamesMapper.listVisibleKeyset(isNull(), isNull(), isNull(), eq(FETCH_LIMIT)))
+                .thenReturn(games(FETCH_LIMIT));
+
+        ModelAndView mv = controller().indexView(null, null);
+
+        assertThat(mv.getViewName()).isEqualTo("index");
+        List<?> games = (List<?>) mv.getModel().get("games");
+        assertThat(games).hasSize(HUB_PAGE_SIZE);
+
+        // nextCursor 는 잘린 24건 중 마지막(index 23) 행 기준이어야 한다.
+        GameData boundary = (GameData) games.get(HUB_PAGE_SIZE - 1);
+        String expected = boundary.getSortOrder() + "_"
+                + boundary.getCreatedAt().toInstant().toEpochMilli() + "_"
+                + boundary.getId();
+        assertThat(mv.getModel().get("nextCursor")).isEqualTo(expected);
+    }
+
+    @Test
+    void firstPage_noNextCursor_whenResultsAtOrBelowPageSize() {
+        when(jamsMapper.countActive()).thenReturn(0);
+        when(gamesMapper.listVisibleKeyset(isNull(), isNull(), isNull(), eq(FETCH_LIMIT)))
+                .thenReturn(games(HUB_PAGE_SIZE));
+
+        ModelAndView mv = controller().indexView(null, null);
+
+        List<?> games = (List<?>) mv.getModel().get("games");
+        assertThat(games).hasSize(HUB_PAGE_SIZE);
+        assertThat(mv.getModel().get("nextCursor")).isNull();
+    }
+
+    @Test
+    void secondPage_parsesCursorAndPassesToMapper() {
+        when(jamsMapper.countActive()).thenReturn(0);
+        when(gamesMapper.listVisibleKeyset(any(), any(), any(), eq(FETCH_LIMIT)))
+                .thenReturn(new ArrayList<>());
+
+        controller().indexView(null, "10_1718000000000_57");
+
+        ArgumentCaptor<Integer> sortCaptor = ArgumentCaptor.forClass(Integer.class);
+        ArgumentCaptor<OffsetDateTime> createdCaptor = ArgumentCaptor.forClass(OffsetDateTime.class);
+        ArgumentCaptor<Long> idCaptor = ArgumentCaptor.forClass(Long.class);
+        ArgumentCaptor<Integer> limitCaptor = ArgumentCaptor.forClass(Integer.class);
+        verify(gamesMapper).listVisibleKeyset(
+                sortCaptor.capture(), createdCaptor.capture(), idCaptor.capture(), limitCaptor.capture());
+
+        assertThat(sortCaptor.getValue()).isEqualTo(10);
+        assertThat(idCaptor.getValue()).isEqualTo(57L);
+        assertThat(createdCaptor.getValue().toInstant().toEpochMilli()).isEqualTo(1718000000000L);
+        assertThat(limitCaptor.getValue()).isEqualTo(FETCH_LIMIT);
+    }
+
+    @Test
+    void malformedCursor_fallsBackToFirstPage() {
+        when(jamsMapper.countActive()).thenReturn(0);
+        when(gamesMapper.listVisibleKeyset(isNull(), isNull(), isNull(), eq(FETCH_LIMIT)))
+                .thenReturn(new ArrayList<>());
+
+        WebMvcController controller = controller();
+        // 각각: 구분자 없음 / 컴포넌트 3 미만 / 숫자 파싱 실패 — 모두 첫 페이지 폴백, 예외 없음.
+        controller.indexView(null, "garbage");
+        controller.indexView(null, "1_2");
+        controller.indexView(null, "x_y_z");
+
+        verify(gamesMapper, never()).listVisibleKeyset(
+                any(Integer.class), any(OffsetDateTime.class), any(Long.class), anyInt());
+    }
+
+    @Test
+    void searchQuery_usesSearchKeysetAndPreservesQuery() {
+        when(jamsMapper.countActive()).thenReturn(0);
+        when(gamesMapper.searchVisibleKeyset(eq("플랫폼"), isNull(), isNull(), isNull(), eq(FETCH_LIMIT)))
+                .thenReturn(games(FETCH_LIMIT));
+
+        ModelAndView mv = controller().indexView("플랫폼", null);
+
+        assertThat(mv.getModel().get("searchQuery")).isEqualTo("플랫폼");
+        assertThat(mv.getModel().get("nextCursor")).isNotNull();
+        verify(gamesMapper).searchVisibleKeyset("플랫폼", null, null, null, FETCH_LIMIT);
+        verify(gamesMapper, never()).listVisibleKeyset(any(), any(), any(), anyInt());
+    }
+
+    @Test
+    void searchQuery_withCursor_passesBoth() {
+        when(jamsMapper.countActive()).thenReturn(0);
+        when(gamesMapper.searchVisibleKeyset(eq("플랫폼"), any(), any(), any(), eq(FETCH_LIMIT)))
+                .thenReturn(new ArrayList<>());
+
+        controller().indexView("플랫폼", "10_1718000000000_57");
+
+        ArgumentCaptor<String> queryCaptor = ArgumentCaptor.forClass(String.class);
+        ArgumentCaptor<Integer> sortCaptor = ArgumentCaptor.forClass(Integer.class);
+        ArgumentCaptor<OffsetDateTime> createdCaptor = ArgumentCaptor.forClass(OffsetDateTime.class);
+        ArgumentCaptor<Long> idCaptor = ArgumentCaptor.forClass(Long.class);
+        ArgumentCaptor<Integer> limitCaptor = ArgumentCaptor.forClass(Integer.class);
+        verify(gamesMapper).searchVisibleKeyset(
+                queryCaptor.capture(), sortCaptor.capture(), createdCaptor.capture(),
+                idCaptor.capture(), limitCaptor.capture());
+
+        assertThat(queryCaptor.getValue()).isEqualTo("플랫폼");
+        assertThat(sortCaptor.getValue()).isEqualTo(10);
+        assertThat(idCaptor.getValue()).isEqualTo(57L);
+        assertThat(limitCaptor.getValue()).isEqualTo(FETCH_LIMIT);
+    }
+
+    @Test
+    void banner_renderedWhenActiveJamExists() {
+        when(jamsMapper.countActive()).thenReturn(3);
+        when(jamsMapper.listActive(1)).thenReturn(List.of(jam("summer-jam", "여름 게임잼")));
+        when(gamesMapper.listVisibleKeyset(isNull(), isNull(), isNull(), eq(FETCH_LIMIT)))
+                .thenReturn(new ArrayList<>());
+
+        ModelAndView mv = controller().indexView(null, null);
+
+        assertThat(mv.getModel().get("activeJam")).isNotNull();
+        assertThat(mv.getModel().get("activeJamCount")).isEqualTo(3);
+    }
+
+    @Test
+    void banner_notRendered_whenNoActiveJam() {
+        when(jamsMapper.countActive()).thenReturn(0);
+        when(gamesMapper.listVisibleKeyset(isNull(), isNull(), isNull(), eq(FETCH_LIMIT)))
+                .thenReturn(new ArrayList<>());
+
+        ModelAndView mv = controller().indexView(null, null);
+
+        assertThat(mv.getModel().get("activeJam")).isNull();
+        assertThat(mv.getModel().get("activeJamCount")).isNull();
+        verify(jamsMapper, never()).listActive(anyInt());
+    }
+
+    // ---- helpers ----
+
+    private WebMvcController controller() {
+        return new WebMvcController(gamesMapper, jamsMapper);
+    }
+
+    private List<GameData> games(int count) {
+        List<GameData> rows = new ArrayList<>(count);
+        for (int i = 0; i < count; i++) {
+            // id/sortOrder/createdAt 모두 유일한 값으로 채워 nextCursor 인코딩이 행마다 구분되게 한다.
+            rows.add(game((long) (i + 1), i + 1, 1_700_000_000_000L + i));
+        }
+        return rows;
+    }
+
+    private GameData game(long id, int sortOrder, long createdAtMillis) {
+        GameData g = new GameData();
+        g.setId(id);
+        g.setSortOrder(sortOrder);
+        g.setCreatedAt(OffsetDateTime.ofInstant(Instant.ofEpochMilli(createdAtMillis), ZoneOffset.UTC));
+        g.setName("game-" + id);
+        return g;
+    }
+
+    private JamData jam(String slug, String title) {
+        JamData j = new JamData();
+        j.setSlug(slug);
+        j.setTitle(title);
+        j.setStatus("RECRUIT");
+        j.setCreatedAt(OffsetDateTime.ofInstant(Instant.ofEpochMilli(1_700_000_000_000L), ZoneOffset.UTC));
+        return j;
+    }
+}