From c2d17d0bc79c6a5cc0ab18feaf6ccec1f19d46c9 Mon Sep 17 00:00:00 2001
From: lobo <andreas.dahm@gmail.com>
Date: Sat, 26 Sep 2026 12:27:58 +0200
Subject: [PATCH] feat(library): hide games from lists and stats

---
 readme.md                                     |   7 +-
 .../library/api/LibraryController.java        |  19 +-
 .../library/api/dto/GameDetailDto.java        |   4 +-
 .../modules/library/api/dto/GameDto.java      |   4 +-
 .../library/api/dto/HiddenUpdateDto.java      |   5 +
 .../modules/library/domain/UserGame.java      |   4 +
 .../library/repo/PlaytimeDayRepository.java   |   8 +-
 .../library/repo/UserGameRepository.java      |  44 +++--
 .../service/AchievementSyncService.java       |   2 +-
 .../library/service/BacklogService.java       |  24 +++
 .../library/service/GameDetailService.java    |  23 ++-
 .../library/service/ImageRepairService.java   |   4 +-
 .../library/service/LibraryQueryService.java  |  21 ++-
 .../library/service/LibrarySyncWorker.java    |   2 +
 .../library/service/ManualGameService.java    |   2 +
 .../modules/stats/repo/StatsRepository.java   |  18 +-
 .../db/migration/V12__hidden_games.sql        |   5 +
 .../api/LibraryControllerBrokenImageTest.java |  14 ++
 .../api/LibraryControllerHiddenTest.java      | 173 ++++++++++++++++++
 .../library/api/ManualGameControllerTest.java |  13 ++
 .../repo/PlaytimeDayRepositoryTest.java       |  30 +++
 .../library/repo/UserGameRepositoryTest.java  |  69 ++++++-
 .../service/AchievementSyncServiceTest.java   |  11 ++
 .../service/GameDetailServiceTest.java        |  16 ++
 .../service/ImageRepairServiceTest.java       |   4 +-
 .../service/LibrarySyncWorkerTest.java        |  25 +++
 .../stats/repo/StatsRepositoryTest.java       |  64 +++++++
 27 files changed, 559 insertions(+), 56 deletions(-)
 create mode 100644 src/main/java/core_service/modules/library/api/dto/HiddenUpdateDto.java
 create mode 100644 src/main/resources/db/migration/V12__hidden_games.sql
 create mode 100644 src/test/java/core_service/modules/library/api/LibraryControllerHiddenTest.java
 create mode 100644 src/test/java/core_service/modules/stats/repo/StatsRepositoryTest.java

diff --git a/readme.md b/readme.md
index ea57f36..aab8898 100644
--- a/readme.md
+++ b/readme.md
@@ -31,6 +31,10 @@ To Be Played is split into three repositories:
   games closest to 100 %.
 - **Playtime history**: one row per game and day, for the activity view and the "most played in the last two weeks"
   dashboard banner.
+- **Hide games**: a user can hide a Steam game (e.g. a playtest or a tool). It leaves every list and number: library,
+  picker, Pile of Shame, activity, achievement summary, public profile and landing page stats. The sync still
+  updates its playtime, but no achievements, time to beat, moods or speedrun data are fetched for it. The library
+  lists hidden games with `hidden=true`.
 - **Wishlist**: synced from Steam with store price and discount.
 - **Broken image repair**: the frontend reports a Steam cover or achievement icon that does not load. At 01:30
   (Europe/Berlin) a job checks up to 200 reports. A cover that loads again is left alone; else the store's hashed
@@ -61,6 +65,7 @@ accepted only by `GET /api/public/profiles/library` in the `X-Profile-Ticket` he
 | `GET` | `/api/library/games`, `/api/library/games/{appid}` | JWT |
 | `PUT` | `/api/library/games/{appid}/backlog` | JWT |
 | `PUT` | `/api/library/games/{appid}/status` (status only, keeps rating, notes, priority) | JWT |
+| `PUT` | `/api/library/games/{appid}/hidden` (`{hidden}`; `409 MANUAL_GAME` for a game added by hand) | JWT |
 | `POST` | `/api/library/sync` | JWT |
 | `POST` | `/api/library/broken-images` (`{appid, kind}`, kind `COVER` or `ACHIEVEMENT_ICONS`; `204`) | JWT |
 | `GET` | `/api/library/picker?maxMinutes=&mood=&count=&exclude=` | JWT |
@@ -143,7 +148,7 @@ Inside a module: `api` (controllers, DTOs), `service` (business logic), `domain`
    the playtime growth of the day to `user_game_playtime_day`, and soft-deletes Steam games the user no longer
    owns. When Steam returns no games, the library stays as it is.
 5. `TimeToBeatService` and `MoodService` ask IGDB for missing or old time-to-beat and mood data, for Steam games
-   and manual games.
+   and manual games. Hidden games only get their playtime updated.
 6. After the commit, `LibrarySyncedEvent` starts `AchievementSyncService` and `SpeedrunService` (backlog games only)
    in the background.
 
diff --git a/src/main/java/core_service/modules/library/api/LibraryController.java b/src/main/java/core_service/modules/library/api/LibraryController.java
index efb8802..b65f397 100644
--- a/src/main/java/core_service/modules/library/api/LibraryController.java
+++ b/src/main/java/core_service/modules/library/api/LibraryController.java
@@ -5,6 +5,7 @@ import core_service.modules.library.api.dto.ActivityDto;
 import core_service.modules.library.api.dto.BacklogEntryDto;
 import core_service.modules.library.api.dto.BrokenImageReport;
 import core_service.modules.library.api.dto.GameDto;
+import core_service.modules.library.api.dto.HiddenUpdateDto;
 import core_service.modules.library.api.dto.LibrarySummaryDto;
 import core_service.modules.library.api.dto.PageDto;
 import core_service.modules.library.api.dto.PickerDto;
@@ -88,7 +89,8 @@ public class LibraryController {
             @RequestParam(defaultValue = "playtimeMinutes,desc") String sort,
             @RequestParam(required = false) GameStatus status,
             @RequestParam(required = false) String q,
-            @RequestParam(required = false) Integer maxMinutes
+            @RequestParam(required = false) Integer maxMinutes,
+            @RequestParam(defaultValue = "false") boolean hidden
     ) {
         Long userId = principal.getIdAsLong();
         if (principal.steamId() != null) {
@@ -98,7 +100,7 @@ public class LibraryController {
         int safeSize = ALLOWED_SIZES.contains(size) ? size : DEFAULT_SIZE;
         int safePage = Math.max(0, page);
         Sort safeSort = parseSort(sort);
-        var dtoPage = queryService.listOwnedGames(userId, status, q, maxMinutes != null && maxMinutes > 0 ? maxMinutes : null, PageRequest.of(safePage, safeSize, safeSort));
+        var dtoPage = queryService.listOwnedGames(userId, hidden, status, q, maxMinutes != null && maxMinutes > 0 ? maxMinutes : null, PageRequest.of(safePage, safeSize, safeSort));
         return ResponseEntity.ok(PageDto.of(dtoPage));
     }
 
@@ -162,6 +164,19 @@ public class LibraryController {
                         .body(Map.of("code", "GAME_NOT_FOUND", "message", "Game not in user library")));
     }
 
+    @PutMapping("/games/{appid}/hidden")
+    public ResponseEntity<?> updateHidden(@AuthenticationPrincipal UserPrincipal principal,
+                                          @PathVariable("appid") Long appid,
+                                          @Valid @RequestBody HiddenUpdateDto update) {
+        return switch (backlogService.setHidden(principal.getIdAsLong(), appid, update.hidden())) {
+            case DONE -> ResponseEntity.ok(update);
+            case NOT_FOUND -> ResponseEntity.status(HttpStatus.NOT_FOUND)
+                    .body(Map.of("code", "GAME_NOT_FOUND", "message", "Game not in user library"));
+            case MANUAL_GAME -> ResponseEntity.status(HttpStatus.CONFLICT)
+                    .body(Map.of("code", "MANUAL_GAME", "message", "A game added by hand can be deleted, not hidden"));
+        };
+    }
+
     @PutMapping("/games/{appid}/status")
     public ResponseEntity<?> updateStatus(@AuthenticationPrincipal UserPrincipal principal,
                                           @PathVariable("appid") Long appid,
diff --git a/src/main/java/core_service/modules/library/api/dto/GameDetailDto.java b/src/main/java/core_service/modules/library/api/dto/GameDetailDto.java
index 5f37579..83cc4c6 100644
--- a/src/main/java/core_service/modules/library/api/dto/GameDetailDto.java
+++ b/src/main/java/core_service/modules/library/api/dto/GameDetailDto.java
@@ -31,7 +31,9 @@ public record GameDetailDto(
         String platform,
         String imageUrl,
         // null until a check finds a speedrun.com game with verified runs
-        String speedrunUrl
+        String speedrunUrl,
+        // see GameDto#hidden
+        boolean hidden
 ) {
 
     /**
diff --git a/src/main/java/core_service/modules/library/api/dto/GameDto.java b/src/main/java/core_service/modules/library/api/dto/GameDto.java
index d67980e..4d8d708 100644
--- a/src/main/java/core_service/modules/library/api/dto/GameDto.java
+++ b/src/main/java/core_service/modules/library/api/dto/GameDto.java
@@ -10,6 +10,7 @@ import core_service.modules.library.domain.GameStatus;
  * @param achievementsUnlocked null when not fetched yet or hidden by Steam
  * @param platform where the user owns a game added by hand, e.g. "PS5"; null for Steam games
  * @param imageUrl a game added by hand from IGDB, or a repaired Steam header; null means the fixed Steam CDN header
+ * @param hidden the user hid the game; it shows only under the library's hidden filter
  */
 public record GameDto(
         Long appid,
@@ -24,5 +25,6 @@ public record GameDto(
         Integer achievementsTotal,
         GameSource source,
         String platform,
-        String imageUrl
+        String imageUrl,
+        boolean hidden
 ) {}
diff --git a/src/main/java/core_service/modules/library/api/dto/HiddenUpdateDto.java b/src/main/java/core_service/modules/library/api/dto/HiddenUpdateDto.java
new file mode 100644
index 0000000..634a45a
--- /dev/null
+++ b/src/main/java/core_service/modules/library/api/dto/HiddenUpdateDto.java
@@ -0,0 +1,5 @@
+package core_service.modules.library.api.dto;
+
+import jakarta.validation.constraints.NotNull;
+
+public record HiddenUpdateDto(@NotNull Boolean hidden) {}
diff --git a/src/main/java/core_service/modules/library/domain/UserGame.java b/src/main/java/core_service/modules/library/domain/UserGame.java
index 1c7b74e..8e4dd23 100644
--- a/src/main/java/core_service/modules/library/domain/UserGame.java
+++ b/src/main/java/core_service/modules/library/domain/UserGame.java
@@ -48,6 +48,10 @@ public class UserGame {
     @Column(name = "removed_at")
     private Instant removedAt;
 
+    /** Set for a Steam game the user hid; the sync never changes it. */
+    @Column(name = "hidden_at")
+    private Instant hiddenAt;
+
     @Enumerated(EnumType.STRING)
     @Column(name = "status", nullable = false, length = 16)
     private GameStatus status;
diff --git a/src/main/java/core_service/modules/library/repo/PlaytimeDayRepository.java b/src/main/java/core_service/modules/library/repo/PlaytimeDayRepository.java
index 10914c9..7e5ee04 100644
--- a/src/main/java/core_service/modules/library/repo/PlaytimeDayRepository.java
+++ b/src/main/java/core_service/modules/library/repo/PlaytimeDayRepository.java
@@ -23,9 +23,13 @@ public interface PlaytimeDayRepository extends JpaRepository<PlaytimeDay, Playti
                     @Param("day") LocalDate day, @Param("minutes") int minutes);
 
     /**
-     * Only days with playtime; the caller fills the gaps.
+     * Only days with playtime; the caller fills the gaps. A hidden game's days never count, also those from before
+     * it was hidden.
      */
     @Query("select new core_service.modules.library.domain.DayMinutes(p.day, sum(p.minutes)) from PlaytimeDay p " +
-           "where p.userId = :userId and p.day >= :from group by p.day order by p.day")
+           "where p.userId = :userId and p.day >= :from " +
+           "and not exists (select 1 from UserGame ug where ug.userId = p.userId and ug.appid = p.appid " +
+           "and ug.hiddenAt is not null) " +
+           "group by p.day order by p.day")
     List<DayMinutes> minutesPerDay(@Param("userId") Long userId, @Param("from") LocalDate from);
 }
diff --git a/src/main/java/core_service/modules/library/repo/UserGameRepository.java b/src/main/java/core_service/modules/library/repo/UserGameRepository.java
index 8803fd7..d1d02f9 100644
--- a/src/main/java/core_service/modules/library/repo/UserGameRepository.java
+++ b/src/main/java/core_service/modules/library/repo/UserGameRepository.java
@@ -29,6 +29,12 @@ public interface UserGameRepository extends JpaRepository<UserGame, UserGameId>
      */
     long NO_GAME = 0;
 
+    /**
+     * The games a user's lists and numbers show: still owned and not hidden. Needs the alias {@code ug} and the
+     * parameter {@code :userId}.
+     */
+    String LISTED = "ug.userId = :userId and ug.removedAt is null and ug.hiddenAt is null ";
+
     List<UserGame> findByUserIdAndRemovedAtIsNull(Long userId);
 
     @Query("select ug.appid from UserGame ug where ug.userId = :userId and ug.removedAt is null and ug.appid in :appids")
@@ -38,24 +44,34 @@ public interface UserGameRepository extends JpaRepository<UserGame, UserGameId>
            "and ug.source = core_service.modules.library.domain.GameSource.MANUAL")
     List<Long> findActiveManualAppids(@Param("userId") Long userId);
 
-    @Query("select ug.appid from UserGame ug where ug.userId = :userId and ug.removedAt is null " +
+    @Query("select ug.appid from UserGame ug where " + LISTED +
            "and ug.status = core_service.modules.library.domain.GameStatus.BACKLOG")
     List<Long> findBacklogAppids(@Param("userId") Long userId);
 
-    long countByUserIdAndRemovedAtIsNull(Long userId);
+    @Query("select ug.appid from UserGame ug where " + LISTED + "and ug.appid in :appids")
+    List<Long> findListedAppids(@Param("userId") Long userId, @Param("appids") Collection<Long> appids);
 
-    @Query("select coalesce(sum(ug.playtimeMinutes), 0) from UserGame ug where ug.userId = :userId and ug.removedAt is null")
+    @Query("select ug.appid from UserGame ug where ug.userId = :userId and ug.removedAt is null and ug.hiddenAt is not null")
+    List<Long> findHiddenAppids(@Param("userId") Long userId);
+
+    @Query("select count(ug) from UserGame ug where " + LISTED)
+    long countListed(@Param("userId") Long userId);
+
+    @Query("select coalesce(sum(ug.playtimeMinutes), 0) from UserGame ug where " + LISTED)
     long sumPlaytime(@Param("userId") Long userId);
 
-    List<UserGame> findByUserIdAndRemovedAtIsNullAndStatusIn(Long userId, Collection<GameStatus> statuses, Pageable pageable);
+    @Query("select ug from UserGame ug where " + LISTED + "and ug.status in :statuses")
+    List<UserGame> findListedByStatusIn(@Param("userId") Long userId, @Param("statuses") Collection<GameStatus> statuses,
+                                        Pageable pageable);
 
-    List<UserGame> findTop5ByUserIdAndRemovedAtIsNullAndPlaytime2WeeksGreaterThanOrderByPlaytime2WeeksDesc(
-            Long userId, int playtime2Weeks);
+    @Query("select ug from UserGame ug where " + LISTED + "and ug.playtime2Weeks > 0 order by ug.playtime2Weeks desc")
+    List<UserGame> findListedPlayedInTwoWeeks(@Param("userId") Long userId, Pageable pageable);
 
-    long countByUserIdAndRemovedAtIsNullAndPlaytimeMinutes(Long userId, int playtimeMinutes);
+    @Query("select count(ug) from UserGame ug where " + LISTED + "and ug.playtimeMinutes = 0")
+    long countListedNeverPlayed(@Param("userId") Long userId);
 
     @Query("select new core_service.modules.library.domain.StatusCount(ug.status, count(ug)) from UserGame ug " +
-           "where ug.userId = :userId and ug.removedAt is null group by ug.status")
+           "where " + LISTED + "group by ug.status")
     List<StatusCount> countByStatus(@Param("userId") Long userId);
 
     /**
@@ -66,7 +82,8 @@ public interface UserGameRepository extends JpaRepository<UserGame, UserGameId>
      *
      * @param excludeAppid never picked; {@link #NO_GAME} excludes nothing
      */
-    @Query(value = "select * from user_game where user_id = :userId and removed_at is null and status = 'BACKLOG' " +
+    @Query(value = "select * from user_game where user_id = :userId and removed_at is null and hidden_at is null " +
+                   "and status = 'BACKLOG' " +
                    "and appid <> :excludeAppid " +
                    // Weighted random pick: the smallest -ln(u) / weight wins.
                    "order by -ln(1 - random()) / case priority when 'HIGH' then 4 when 'MEDIUM' then 2 else 1 end " +
@@ -78,7 +95,7 @@ public interface UserGameRepository extends JpaRepository<UserGame, UserGameId>
            "from UserGame ug " +
            "left join GameAchievementSchemaMeta sm on sm.appid = ug.appid " +
            "left join UserGameAchievementMeta um on um.userId = ug.userId and um.appid = ug.appid " +
-           "where ug.userId = :userId and ug.removedAt is null " +
+           "where " + LISTED +
            "and ug.source = core_service.modules.library.domain.GameSource.STEAM")
     List<AchievementProgress> findAchievementProgress(@Param("userId") Long userId);
 
@@ -99,7 +116,7 @@ public interface UserGameRepository extends JpaRepository<UserGame, UserGameId>
     }
 
     @Query(value = "select ug.* from user_game ug where ug.user_id = :userId and ug.removed_at is null " +
-                   "and ug.status = 'BACKLOG' and ug.appid not in (:excludeAppids) " +
+                   "and ug.hidden_at is null and ug.status = 'BACKLOG' and ug.appid not in (:excludeAppids) " +
                    "and (cast(:maxMinutes as integer) is null or exists (select 1 from game_time_to_beat t " +
                    "     where t.appid = ug.appid and t.normally_minutes <= :maxMinutes)) " +
                    "and (cast(:mood as varchar) is null or exists (select 1 from game_mood m " +
@@ -116,17 +133,20 @@ public interface UserGameRepository extends JpaRepository<UserGame, UserGameId>
                                     @Param("count") int count);
 
     /**
+     * @param hidden true for only the hidden games, false for only the listed ones
      * @param status null for every status
      * @param namePattern a {@link #containsPattern} result, null for every name
      * @param maxMinutes only games whose normal time to beat is known and at most this; null for every game
      */
     @Query("select ug from UserGame ug join SteamGame sg on sg.appid = ug.appid " +
            "where ug.userId = :userId and ug.removedAt is null " +
+           "and ((:hidden = true and ug.hiddenAt is not null) or (:hidden = false and ug.hiddenAt is null)) " +
            "and (:status is null or ug.status = :status) " +
            "and (:namePattern is null or lower(sg.name) like :namePattern escape '\\') " +
            "and (:maxMinutes is null or exists (select 1 from GameTimeToBeat t " +
            "     where t.appid = ug.appid and t.normallyMinutes <= :maxMinutes))")
     Page<UserGame> findOwnedGames(@Param("userId") Long userId,
+                                  @Param("hidden") boolean hidden,
                                   @Param("status") GameStatus status,
                                   @Param("namePattern") String namePattern,
                                   @Param("maxMinutes") Integer maxMinutes,
@@ -136,7 +156,7 @@ public interface UserGameRepository extends JpaRepository<UserGame, UserGameId>
      * Normal time to beat of the user's backlog, only games IGDB has data for.
      */
     @Query("select coalesce(sum(t.normallyMinutes), 0) from UserGame ug join GameTimeToBeat t on t.appid = ug.appid " +
-           "where ug.userId = :userId and ug.removedAt is null " +
+           "where " + LISTED +
            "and ug.status = core_service.modules.library.domain.GameStatus.BACKLOG")
     long sumBacklogMinutes(@Param("userId") Long userId);
 
diff --git a/src/main/java/core_service/modules/library/service/AchievementSyncService.java b/src/main/java/core_service/modules/library/service/AchievementSyncService.java
index c1fa59b..abb1c56 100644
--- a/src/main/java/core_service/modules/library/service/AchievementSyncService.java
+++ b/src/main/java/core_service/modules/library/service/AchievementSyncService.java
@@ -143,7 +143,7 @@ public class AchievementSyncService {
 
     private void runLibrarySync(Long userId, String steamId) {
         List<UserGame> games = userGameRepository.findByUserIdAndRemovedAtIsNull(userId).stream()
-                .filter(game -> game.getSource() == GameSource.STEAM)
+                .filter(game -> game.getSource() == GameSource.STEAM && game.getHiddenAt() == null)
                 .sorted(Comparator.comparingInt(UserGame::getPlaytimeMinutes).reversed())
                 .toList();
         Map<Long, GameAchievementSchemaMeta> schemas = schemaMetaRepository
diff --git a/src/main/java/core_service/modules/library/service/BacklogService.java b/src/main/java/core_service/modules/library/service/BacklogService.java
index 3522430..c92e892 100644
--- a/src/main/java/core_service/modules/library/service/BacklogService.java
+++ b/src/main/java/core_service/modules/library/service/BacklogService.java
@@ -1,6 +1,7 @@
 package core_service.modules.library.service;
 
 import core_service.modules.library.api.dto.BacklogEntryDto;
+import core_service.modules.library.domain.GameSource;
 import core_service.modules.library.domain.GameStatus;
 import core_service.modules.library.domain.UserGame;
 import core_service.modules.library.domain.UserGameId;
@@ -9,6 +10,7 @@ import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.time.Instant;
 import java.util.Optional;
 
 @Service
@@ -48,6 +50,28 @@ public class BacklogService {
                 });
     }
 
+    public enum HideResult { DONE, NOT_FOUND, MANUAL_GAME }
+
+    /**
+     * Hides only a Steam game; one added by hand can be deleted instead. Unhiding works for every game. Hiding again
+     * keeps the first time.
+     */
+    @Transactional
+    public HideResult setHidden(Long userId, Long appid, boolean hidden) {
+        Optional<UserGame> game = userGameRepository.findById(new UserGameId(userId, appid))
+                .filter(found -> found.getRemovedAt() == null);
+        if (game.isEmpty()) return HideResult.NOT_FOUND;
+        if (!hidden) {
+            game.get().setHiddenAt(null);
+            return HideResult.DONE;
+        }
+        if (game.get().getSource() != GameSource.STEAM) return HideResult.MANUAL_GAME;
+        if (game.get().getHiddenAt() == null) {
+            game.get().setHiddenAt(Instant.now());
+        }
+        return HideResult.DONE;
+    }
+
     private static BacklogEntryDto toDto(UserGame game) {
         return new BacklogEntryDto(game.getStatus(), game.getRating(), game.getNotes(), game.getPriority());
     }
diff --git a/src/main/java/core_service/modules/library/service/GameDetailService.java b/src/main/java/core_service/modules/library/service/GameDetailService.java
index 8bcf8e9..c43ab3f 100644
--- a/src/main/java/core_service/modules/library/service/GameDetailService.java
+++ b/src/main/java/core_service/modules/library/service/GameDetailService.java
@@ -65,8 +65,12 @@ public class GameDetailService {
         }
         UserGame userGame = userGameOpt.get();
         SteamGame meta = steamGameRepository.findById(appid).orElse(null);
-        // Only backlog games are checked in bulk; any other game gets its link on a later visit.
-        speedrunService.refreshInBackground(List.of(appid));
+        // A hidden game gets no calls to Steam, IGDB or speedrun.com; it shows what is stored.
+        boolean hidden = userGame.getHiddenAt() != null;
+        if (!hidden) {
+            // Only backlog games are checked in bulk; any other game gets its link on a later visit.
+            speedrunService.refreshInBackground(List.of(appid));
+        }
         if (userGame.getSource() == GameSource.MANUAL) {
             // Users without a Steam ID never sync, so the time to beat of their games is asked again here.
             timeToBeatService.refreshInBackground(List.of(appid));
@@ -74,10 +78,12 @@ public class GameDetailService {
             return Optional.of(buildDto(userGame, meta, true, 0, 0, List.of()));
         }
 
-        try {
-            achievementSyncService.refreshSchemaIfStale(appid);
-        } catch (Exception e) {
-            log.warn("Achievement schema of appid={} not refreshed, showing stored data: {}", appid, e.getMessage());
+        if (!hidden) {
+            try {
+                achievementSyncService.refreshSchemaIfStale(appid);
+            } catch (Exception e) {
+                log.warn("Achievement schema of appid={} not refreshed, showing stored data: {}", appid, e.getMessage());
+            }
         }
         boolean hasSchema = schemaMetaRepository.findById(appid).map(GameAchievementSchemaMeta::isHasSchema).orElse(false);
 
@@ -85,7 +91,7 @@ public class GameDetailService {
             return Optional.of(buildDto(userGame, meta, true, 0, 0, List.of()));
         }
 
-        if (steamId != null) {
+        if (steamId != null && !hidden) {
             try {
                 achievementSyncService.refreshUserIfStale(userId, steamId, appid, userGame.getPlaytimeMinutes(),
                         Duration.ofHours(achievementTtlHours));
@@ -155,7 +161,8 @@ public class GameDetailService {
                 userGame.getSource(),
                 userGame.getPlatform(),
                 meta != null ? meta.getImageUrl() : null,
-                gameSpeedrunRepository.findById(userGame.getAppid()).map(GameSpeedrun::getWeblink).orElse(null)
+                gameSpeedrunRepository.findById(userGame.getAppid()).map(GameSpeedrun::getWeblink).orElse(null),
+                userGame.getHiddenAt() != null
         );
     }
 }
diff --git a/src/main/java/core_service/modules/library/service/ImageRepairService.java b/src/main/java/core_service/modules/library/service/ImageRepairService.java
index d94c199..9bb1728 100644
--- a/src/main/java/core_service/modules/library/service/ImageRepairService.java
+++ b/src/main/java/core_service/modules/library/service/ImageRepairService.java
@@ -80,10 +80,10 @@ public class ImageRepairService {
     }
 
     /**
-     * Only for a Steam game the user owns; anything else is dropped.
+     * Only for a listed Steam game of the user: a hidden game gets no Steam calls. Anything else is dropped.
      */
     public void report(Long userId, Long appid, ImageKind kind) {
-        if (!GameKeys.isSteam(appid) || userGameRepository.findActiveAppids(userId, List.of(appid)).isEmpty()) {
+        if (!GameKeys.isSteam(appid) || userGameRepository.findListedAppids(userId, List.of(appid)).isEmpty()) {
             return;
         }
         brokenImageRepository.report(appid, kind.name(), Instant.now());
diff --git a/src/main/java/core_service/modules/library/service/LibraryQueryService.java b/src/main/java/core_service/modules/library/service/LibraryQueryService.java
index a80ba67..e33d005 100644
--- a/src/main/java/core_service/modules/library/service/LibraryQueryService.java
+++ b/src/main/java/core_service/modules/library/service/LibraryQueryService.java
@@ -55,6 +55,7 @@ public class LibraryQueryService {
     private static final int PUBLIC_PLAYING = 8;
     private static final int PUBLIC_FINISHED = 12;
     private static final int CLOSEST_GAMES = 5;
+    private static final int RECENT_GAMES = 5;
 
     private final UserGameRepository userGameRepository;
     private final UserSteamSyncRepository userSteamSyncRepository;
@@ -69,15 +70,15 @@ public class LibraryQueryService {
     private ZoneId zone;
 
     public long countOwnedGames(Long userId) {
-        return userGameRepository.countByUserIdAndRemovedAtIsNull(userId);
+        return userGameRepository.countListed(userId);
     }
 
-    public Page<GameDto> listOwnedGames(Long userId, GameStatus status, String nameQuery, Integer maxMinutes,
-                                        Pageable pageable) {
+    public Page<GameDto> listOwnedGames(Long userId, boolean hidden, GameStatus status, String nameQuery,
+                                        Integer maxMinutes, Pageable pageable) {
         Pageable stable = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize(),
                 UserGameRepository.querySort(pageable.getSort()));
         Page<UserGame> page = userGameRepository.findOwnedGames(
-                userId, status, UserGameRepository.containsPattern(nameQuery), maxMinutes, stable);
+                userId, hidden, status, UserGameRepository.containsPattern(nameQuery), maxMinutes, stable);
         List<GameDto> games = toDtos(page.getContent());
         return new PageImpl<>(games, page.getPageable(), page.getTotalElements());
     }
@@ -155,7 +156,7 @@ public class LibraryQueryService {
     public LibrarySummaryDto getSummary(Long userId, Long excludeAppid) {
         Map<GameStatus, Long> byStatus = countByStatus(userId);
         long total = byStatus.values().stream().mapToLong(Long::longValue).sum();
-        long neverPlayed = userGameRepository.countByUserIdAndRemovedAtIsNullAndPlaytimeMinutes(userId, 0);
+        long neverPlayed = userGameRepository.countListedNeverPlayed(userId);
         GameDto suggestion = userGameRepository.findRandomBacklogGame(userId, excludeAppid != null ? excludeAppid : UserGameRepository.NO_GAME)
                 .map(ug -> toDtos(List.of(ug)).getFirst())
                 .orElse(null);
@@ -175,8 +176,7 @@ public class LibraryQueryService {
                 .toList();
         long total = perDay.stream().mapToLong(DayMinutes::minutes).sum();
 
-        List<UserGame> recent = userGameRepository
-                .findTop5ByUserIdAndRemovedAtIsNullAndPlaytime2WeeksGreaterThanOrderByPlaytime2WeeksDesc(userId, 0);
+        List<UserGame> recent = userGameRepository.findListedPlayedInTwoWeeks(userId, PageRequest.of(0, RECENT_GAMES));
         Map<Long, SteamGame> meta = steamGameRepository.findAllById(recent.stream().map(UserGame::getAppid).toList())
                 .stream().collect(Collectors.toMap(SteamGame::getAppid, g -> g));
         List<RecentGameDto> recentGames = recent.stream()
@@ -193,10 +193,10 @@ public class LibraryQueryService {
 
     public PublicLibraryDto getPublicLibrary(Long userId) {
         Map<GameStatus, Long> byStatus = countByStatus(userId);
-        List<UserGame> playing = userGameRepository.findByUserIdAndRemovedAtIsNullAndStatusIn(userId,
+        List<UserGame> playing = userGameRepository.findListedByStatusIn(userId,
                 List.of(GameStatus.PLAYING),
                 PageRequest.of(0, PUBLIC_PLAYING, Sort.by(Sort.Direction.DESC, "playtimeMinutes").and(Sort.by("appid"))));
-        List<UserGame> finished = userGameRepository.findByUserIdAndRemovedAtIsNullAndStatusIn(userId,
+        List<UserGame> finished = userGameRepository.findListedByStatusIn(userId,
                 List.of(GameStatus.FINISHED, GameStatus.COMPLETED),
                 PageRequest.of(0, PUBLIC_FINISHED, Sort.by(Sort.Order.desc("rating").nullsLast()).and(Sort.by("appid"))));
         Map<Long, SteamGame> meta = steamGameRepository.findAllById(
@@ -254,7 +254,8 @@ public class LibraryQueryService {
                 achievementsTotal,
                 ug.getSource(),
                 ug.getPlatform(),
-                meta != null ? meta.getImageUrl() : null);
+                meta != null ? meta.getImageUrl() : null,
+                ug.getHiddenAt() != null);
     }
 
     public Optional<UserSteamSync> getSyncStatus(Long userId) {
diff --git a/src/main/java/core_service/modules/library/service/LibrarySyncWorker.java b/src/main/java/core_service/modules/library/service/LibrarySyncWorker.java
index 308745d..4e205ae 100644
--- a/src/main/java/core_service/modules/library/service/LibrarySyncWorker.java
+++ b/src/main/java/core_service/modules/library/service/LibrarySyncWorker.java
@@ -26,6 +26,7 @@ import java.time.Instant;
 import java.time.LocalDate;
 import java.time.ZoneId;
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
@@ -122,6 +123,7 @@ public class LibrarySyncWorker {
             // Also the games added by hand: here a failed refresh from the add is asked again.
             List<Long> igdbAppids = new ArrayList<>(games.stream().filter(g -> g.appid() != null).map(g -> g.appid().longValue()).toList());
             igdbAppids.addAll(userGameRepository.findActiveManualAppids(userId));
+            igdbAppids.removeAll(new HashSet<>(userGameRepository.findHiddenAppids(userId)));
             timeToBeatService.refresh(igdbAppids);
             moodService.refresh(igdbAppids);
             eventPublisher.publishEvent(new LibrarySyncedEvent(userId, steamId));
diff --git a/src/main/java/core_service/modules/library/service/ManualGameService.java b/src/main/java/core_service/modules/library/service/ManualGameService.java
index 64abf56..031e89c 100644
--- a/src/main/java/core_service/modules/library/service/ManualGameService.java
+++ b/src/main/java/core_service/modules/library/service/ManualGameService.java
@@ -171,6 +171,8 @@ public class ManualGameService {
                 revived.setPlaytime2Weeks(0);
                 revived.setLastSeenAt(now);
                 revived.setRemovedAt(null);
+                // Only a Steam game can be hidden.
+                revived.setHiddenAt(null);
             } else {
                 userGameRepository.save(UserGame.manual(userId, appid, platform, status, playtimeMinutes, now));
             }
diff --git a/src/main/java/core_service/modules/stats/repo/StatsRepository.java b/src/main/java/core_service/modules/stats/repo/StatsRepository.java
index cd3d41a..252b10a 100644
--- a/src/main/java/core_service/modules/stats/repo/StatsRepository.java
+++ b/src/main/java/core_service/modules/stats/repo/StatsRepository.java
@@ -19,31 +19,31 @@ public class StatsRepository {
 
     public long countDistinctGames() {
         Long v = jdbc.queryForObject(
-                "SELECT COUNT(DISTINCT appid) FROM user_game WHERE removed_at IS NULL", Long.class);
+                "SELECT COUNT(DISTINCT appid) FROM user_game WHERE removed_at IS NULL AND hidden_at IS NULL", Long.class);
         return v != null ? v : 0L;
     }
 
     public long countLibraryEntries() {
         Long v = jdbc.queryForObject(
-                "SELECT COUNT(*) FROM user_game WHERE removed_at IS NULL", Long.class);
+                "SELECT COUNT(*) FROM user_game WHERE removed_at IS NULL AND hidden_at IS NULL", Long.class);
         return v != null ? v : 0L;
     }
 
     public long countGamesPlayed() {
         Long v = jdbc.queryForObject(
-                "SELECT COUNT(*) FROM user_game WHERE removed_at IS NULL AND playtime_minutes > 0", Long.class);
+                "SELECT COUNT(*) FROM user_game WHERE removed_at IS NULL AND hidden_at IS NULL AND playtime_minutes > 0", Long.class);
         return v != null ? v : 0L;
     }
 
     public long sumPlaytimeMinutes() {
         Long v = jdbc.queryForObject(
-                "SELECT COALESCE(SUM(playtime_minutes), 0) FROM user_game WHERE removed_at IS NULL", Long.class);
+                "SELECT COALESCE(SUM(playtime_minutes), 0) FROM user_game WHERE removed_at IS NULL AND hidden_at IS NULL", Long.class);
         return v != null ? v : 0L;
     }
 
     public long countUsersWithLibrary() {
         Long v = jdbc.queryForObject(
-                "SELECT COUNT(DISTINCT user_id) FROM user_game WHERE removed_at IS NULL", Long.class);
+                "SELECT COUNT(DISTINCT user_id) FROM user_game WHERE removed_at IS NULL AND hidden_at IS NULL", Long.class);
         return v != null ? v : 0L;
     }
 
@@ -51,7 +51,7 @@ public class StatsRepository {
         Long v = jdbc.queryForObject("""
                 SELECT COALESCE(MAX(c), 0) FROM (
                     SELECT COUNT(*) AS c FROM user_game
-                    WHERE removed_at IS NULL GROUP BY user_id
+                    WHERE removed_at IS NULL AND hidden_at IS NULL GROUP BY user_id
                 ) t
                 """, Long.class);
         return v != null ? v : 0L;
@@ -61,7 +61,7 @@ public class StatsRepository {
         Long v = jdbc.queryForObject("""
                 SELECT COALESCE(MAX(c), 0) FROM (
                     SELECT COUNT(*) AS c FROM user_game
-                    WHERE removed_at IS NULL AND playtime_minutes = 0 GROUP BY user_id
+                    WHERE removed_at IS NULL AND hidden_at IS NULL AND playtime_minutes = 0 GROUP BY user_id
                 ) t
                 """, Long.class);
         return v != null ? v : 0L;
@@ -72,7 +72,7 @@ public class StatsRepository {
                 SELECT ug.appid, sg.name, sg.img_icon_url, sg.image_url, COUNT(*) AS value
                 FROM user_game ug
                 LEFT JOIN steam_game sg ON sg.appid = ug.appid
-                WHERE ug.removed_at IS NULL
+                WHERE ug.removed_at IS NULL AND ug.hidden_at IS NULL
                 GROUP BY ug.appid, sg.name, sg.img_icon_url, sg.image_url
                 ORDER BY value DESC
                 LIMIT ?
@@ -84,7 +84,7 @@ public class StatsRepository {
                 SELECT ug.appid, sg.name, sg.img_icon_url, sg.image_url, SUM(ug.playtime_minutes) AS value
                 FROM user_game ug
                 LEFT JOIN steam_game sg ON sg.appid = ug.appid
-                WHERE ug.removed_at IS NULL
+                WHERE ug.removed_at IS NULL AND ug.hidden_at IS NULL
                 GROUP BY ug.appid, sg.name, sg.img_icon_url, sg.image_url
                 ORDER BY value DESC
                 LIMIT ?
diff --git a/src/main/resources/db/migration/V12__hidden_games.sql b/src/main/resources/db/migration/V12__hidden_games.sql
new file mode 100644
index 0000000..4ff290f
--- /dev/null
+++ b/src/main/resources/db/migration/V12__hidden_games.sql
@@ -0,0 +1,5 @@
+-- A game the user hid (e.g. a playtest or a tool). It stays owned and synced, but leaves every list and number.
+ALTER TABLE user_game ADD COLUMN hidden_at TIMESTAMPTZ;
+
+DROP INDEX idx_user_game_user_active;
+CREATE INDEX idx_user_game_user_active ON user_game (user_id) WHERE removed_at IS NULL AND hidden_at IS NULL;
diff --git a/src/test/java/core_service/modules/library/api/LibraryControllerBrokenImageTest.java b/src/test/java/core_service/modules/library/api/LibraryControllerBrokenImageTest.java
index 8caf6bc..36c9423 100644
--- a/src/test/java/core_service/modules/library/api/LibraryControllerBrokenImageTest.java
+++ b/src/test/java/core_service/modules/library/api/LibraryControllerBrokenImageTest.java
@@ -5,6 +5,7 @@ import core_service.modules.library.domain.BrokenImageId;
 import core_service.modules.library.domain.ImageKind;
 import core_service.modules.library.domain.SteamGame;
 import core_service.modules.library.domain.UserGame;
+import core_service.modules.library.domain.UserGameId;
 import core_service.modules.library.repo.BrokenImageRepository;
 import core_service.modules.library.repo.SteamGameRepository;
 import core_service.modules.library.repo.UserGameRepository;
@@ -71,6 +72,19 @@ class LibraryControllerBrokenImageTest extends AbstractIntegrationTest {
         assertThat(brokenImageRepository.count()).isZero();
     }
 
+    @Test
+    void reportBrokenImage_ForAHiddenGameStoresNothing() throws Exception {
+        UserGame hidden = userGameRepository.findById(new UserGameId(USER_ID, APPID)).orElseThrow();
+        hidden.setHiddenAt(Instant.now());
+        userGameRepository.save(hidden);
+
+        mockMvc.perform(post("/api/library/broken-images").header(ClientHeaderFilter.CLIENT_HEADER, "test")
+                        .contentType(MediaType.APPLICATION_JSON).content("{\"appid\":220,\"kind\":\"COVER\"}"))
+                .andExpect(status().isNoContent());
+
+        assertThat(brokenImageRepository.count()).isZero();
+    }
+
     @ParameterizedTest
     @ValueSource(strings = {"{\"appid\":220,\"kind\":\"BANNER\"}", "{\"appid\":220}", "{\"kind\":\"COVER\"}"})
     void reportBrokenImage_BadBodyIs400(String body) throws Exception {
diff --git a/src/test/java/core_service/modules/library/api/LibraryControllerHiddenTest.java b/src/test/java/core_service/modules/library/api/LibraryControllerHiddenTest.java
new file mode 100644
index 0000000..77c3a57
--- /dev/null
+++ b/src/test/java/core_service/modules/library/api/LibraryControllerHiddenTest.java
@@ -0,0 +1,173 @@
+package core_service.modules.library.api;
+
+import core_service.configuration.security.ClientHeaderFilter;
+import core_service.modules.library.domain.GameStatus;
+import core_service.modules.library.domain.SteamGame;
+import core_service.modules.library.domain.UserGame;
+import core_service.modules.library.domain.UserGameId;
+import core_service.modules.library.repo.SteamGameRepository;
+import core_service.modules.library.repo.UserGameRepository;
+import core_service.shared.test.AbstractIntegrationTest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.webmvc.test.autoconfigure.AutoConfigureMockMvc;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.ResultActions;
+
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+
+import static org.hamcrest.Matchers.hasSize;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * The dev profile authenticates every request as user 1.
+ */
+@AutoConfigureMockMvc
+class LibraryControllerHiddenTest extends AbstractIntegrationTest {
+
+    private static final long USER_ID = 1L;
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Autowired
+    private SteamGameRepository steamGameRepository;
+
+    @Autowired
+    private UserGameRepository userGameRepository;
+
+    @BeforeEach
+    void seed() {
+        userGameRepository.deleteAll();
+        steamGameRepository.save(new SteamGame(220L, "Half-Life 2", null, Instant.now()));
+        steamGameRepository.save(new SteamGame(1000L, "Some Playtest", null, Instant.now()));
+        steamGameRepository.save(new SteamGame(-1942L, "Zelda", null, Instant.now()));
+        userGameRepository.save(new UserGame(USER_ID, 220L, 300, Instant.now(), Instant.now()));
+        userGameRepository.save(new UserGame(USER_ID, 1000L, 0, Instant.now(), Instant.now()));
+        userGameRepository.save(UserGame.manual(USER_ID, -1942L, "Switch", GameStatus.PLAYING, 60, Instant.now()));
+    }
+
+    private ResultActions setHidden(long appid, String body) throws Exception {
+        return mockMvc.perform(put("/api/library/games/" + appid + "/hidden").header(ClientHeaderFilter.CLIENT_HEADER, "test")
+                .contentType(MediaType.APPLICATION_JSON).content(body));
+    }
+
+    private UserGame stored(long appid) {
+        return userGameRepository.findById(new UserGameId(USER_ID, appid)).orElseThrow();
+    }
+
+    @Test
+    void hideAndUnhide_MoveTheGameBetweenTheLists() throws Exception {
+        setHidden(1000L, "{\"hidden\":true}")
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.hidden").value(true));
+
+        mockMvc.perform(get("/api/library/games"))
+                .andExpect(jsonPath("$.content", hasSize(2)))
+                .andExpect(jsonPath("$.content[?(@.appid == 1000)]").isEmpty());
+        mockMvc.perform(get("/api/library/games?hidden=true"))
+                .andExpect(jsonPath("$.content", hasSize(1)))
+                .andExpect(jsonPath("$.content[0].appid").value(1000))
+                .andExpect(jsonPath("$.content[0].hidden").value(true));
+        mockMvc.perform(get("/api/library/games-count")).andExpect(jsonPath("$.count").value(2));
+        mockMvc.perform(get("/api/library/summary")).andExpect(jsonPath("$.total").value(2));
+        mockMvc.perform(get("/api/library/games/1000"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.hidden").value(true));
+
+        setHidden(1000L, "{\"hidden\":false}").andExpect(status().isOk());
+
+        assertNull(stored(1000L).getHiddenAt());
+        mockMvc.perform(get("/api/library/games-count")).andExpect(jsonPath("$.count").value(3));
+    }
+
+    @Test
+    void hide_AHiddenGameKeepsTheFirstTime() throws Exception {
+        Instant first = Instant.now().minus(3, ChronoUnit.DAYS).truncatedTo(ChronoUnit.MICROS);
+        UserGame game = stored(1000L);
+        game.setHiddenAt(first);
+        userGameRepository.save(game);
+
+        setHidden(1000L, "{\"hidden\":true}").andExpect(status().isOk());
+
+        assertEquals(first, stored(1000L).getHiddenAt());
+    }
+
+    @Test
+    void hide_UnknownGameIs404() throws Exception {
+        setHidden(620L, "{\"hidden\":true}")
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value("GAME_NOT_FOUND"));
+    }
+
+    @Test
+    void hide_RemovedGameIs404() throws Exception {
+        UserGame game = stored(1000L);
+        game.setRemovedAt(Instant.now());
+        userGameRepository.save(game);
+
+        setHidden(1000L, "{\"hidden\":true}").andExpect(status().isNotFound());
+    }
+
+    @Test
+    void hide_GameAddedByHandIs409() throws Exception {
+        setHidden(-1942L, "{\"hidden\":true}")
+                .andExpect(status().isConflict())
+                .andExpect(jsonPath("$.code").value("MANUAL_GAME"));
+
+        assertNull(stored(-1942L).getHiddenAt());
+    }
+
+    @Test
+    void unhide_WorksForAnyGame() throws Exception {
+        UserGame manual = stored(-1942L);
+        manual.setHiddenAt(Instant.now());
+        userGameRepository.save(manual);
+
+        setHidden(-1942L, "{\"hidden\":false}").andExpect(status().isOk());
+
+        assertNull(stored(-1942L).getHiddenAt());
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"{}", "{\"hidden\":null}", "{\"hidden\":\"maybe\"}"})
+    void hide_BadBodyIs400(String body) throws Exception {
+        setHidden(1000L, body).andExpect(status().isBadRequest());
+
+        assertNull(stored(1000L).getHiddenAt());
+    }
+
+    @Test
+    void hide_WithoutClientHeaderIs403() throws Exception {
+        mockMvc.perform(put("/api/library/games/1000/hidden")
+                        .contentType(MediaType.APPLICATION_JSON).content("{\"hidden\":true}"))
+                .andExpect(status().isForbidden());
+
+        assertNull(stored(1000L).getHiddenAt());
+    }
+
+    @Test
+    void hide_KeepsStatusAndNotes() throws Exception {
+        UserGame game = stored(220L);
+        game.setNotes("keep me");
+        userGameRepository.save(game);
+
+        setHidden(220L, "{\"hidden\":true}").andExpect(status().isOk());
+
+        UserGame after = stored(220L);
+        assertNotNull(after.getHiddenAt());
+        assertEquals(GameStatus.PLAYING, after.getStatus());
+        assertEquals("keep me", after.getNotes());
+    }
+}
diff --git a/src/test/java/core_service/modules/library/api/ManualGameControllerTest.java b/src/test/java/core_service/modules/library/api/ManualGameControllerTest.java
index dcf8365..63f47ae 100644
--- a/src/test/java/core_service/modules/library/api/ManualGameControllerTest.java
+++ b/src/test/java/core_service/modules/library/api/ManualGameControllerTest.java
@@ -174,6 +174,19 @@ class ManualGameControllerTest extends AbstractIntegrationTest {
         assertEquals(600, back.getPlaytimeMinutes());
     }
 
+    @Test
+    void add_HiddenSteamGameRemovedBefore_ComesBackShown() throws Exception {
+        steamGameRepository.save(new SteamGame(1245620L, "ELDEN RING", null, Instant.now()));
+        UserGame refunded = new UserGame(USER_ID, 1245620L, 300, Instant.now(), Instant.now());
+        refunded.setHiddenAt(Instant.now());
+        refunded.setRemovedAt(Instant.now());
+        userGameRepository.save(refunded);
+
+        add(119133, "PS5").andExpect(status().isCreated());
+
+        assertNull(stored(1245620).getHiddenAt());
+    }
+
     @Test
     void add_UnknownIgdbGame_Is400() throws Exception {
         when(igdbApiService.getGame(anyLong())).thenReturn(Optional.empty());
diff --git a/src/test/java/core_service/modules/library/repo/PlaytimeDayRepositoryTest.java b/src/test/java/core_service/modules/library/repo/PlaytimeDayRepositoryTest.java
index 2af611e..b3e135c 100644
--- a/src/test/java/core_service/modules/library/repo/PlaytimeDayRepositoryTest.java
+++ b/src/test/java/core_service/modules/library/repo/PlaytimeDayRepositoryTest.java
@@ -1,10 +1,13 @@
 package core_service.modules.library.repo;
 
 import core_service.modules.library.domain.DayMinutes;
+import core_service.modules.library.domain.SteamGame;
+import core_service.modules.library.domain.UserGame;
 import core_service.shared.test.AbstractPersistenceTest;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 
+import java.time.Instant;
 import java.time.LocalDate;
 import java.util.List;
 
@@ -18,6 +21,12 @@ class PlaytimeDayRepositoryTest extends AbstractPersistenceTest {
     @Autowired
     private PlaytimeDayRepository playtimeDayRepository;
 
+    @Autowired
+    private SteamGameRepository steamGameRepository;
+
+    @Autowired
+    private UserGameRepository userGameRepository;
+
     @Test
     void addMinutes_SameGameAndDay_AddsUp() {
         playtimeDayRepository.addMinutes(USER_ID, 220L, DAY, 30);
@@ -37,4 +46,25 @@ class PlaytimeDayRepositoryTest extends AbstractPersistenceTest {
         assertEquals(List.of(new DayMinutes(DAY, 50), new DayMinutes(DAY.plusDays(2), 10)),
                 playtimeDayRepository.minutesPerDay(USER_ID, DAY));
     }
+
+    @Test
+    void minutesPerDay_LeavesOutHiddenGames() {
+        steamGameRepository.saveAll(List.of(new SteamGame(220L, "Half-Life 2", null, Instant.now()),
+                new SteamGame(620L, "Portal 2", null, Instant.now())));
+        UserGame hidden = new UserGame(USER_ID, 620L, 60, Instant.now(), Instant.now());
+        hidden.setHiddenAt(Instant.now());
+        userGameRepository.saveAll(List.of(new UserGame(USER_ID, 220L, 30, Instant.now(), Instant.now()), hidden,
+                // Another user's hidden flag does not hide the game for this user.
+                hiddenFor(2L, 220L)));
+        playtimeDayRepository.addMinutes(USER_ID, 220L, DAY, 30);
+        playtimeDayRepository.addMinutes(USER_ID, 620L, DAY, 60);
+
+        assertEquals(List.of(new DayMinutes(DAY, 30)), playtimeDayRepository.minutesPerDay(USER_ID, DAY));
+    }
+
+    private static UserGame hiddenFor(long userId, long appid) {
+        UserGame game = new UserGame(userId, appid, 0, Instant.now(), Instant.now());
+        game.setHiddenAt(Instant.now());
+        return game;
+    }
 }
diff --git a/src/test/java/core_service/modules/library/repo/UserGameRepositoryTest.java b/src/test/java/core_service/modules/library/repo/UserGameRepositoryTest.java
index 5afc9ab..711a391 100644
--- a/src/test/java/core_service/modules/library/repo/UserGameRepositoryTest.java
+++ b/src/test/java/core_service/modules/library/repo/UserGameRepositoryTest.java
@@ -61,7 +61,7 @@ class UserGameRepositoryTest extends AbstractPersistenceTest {
     }
 
     private List<Long> appids(GameStatus status, String query) {
-        return userGameRepository.findOwnedGames(USER_ID, status, UserGameRepository.containsPattern(query), null, PAGE)
+        return userGameRepository.findOwnedGames(USER_ID, false, status, UserGameRepository.containsPattern(query), null, PAGE)
                 .map(UserGame::getAppid).getContent();
     }
 
@@ -136,7 +136,7 @@ class UserGameRepositoryTest extends AbstractPersistenceTest {
 
     @Test
     void findOwnedGames_CountsAllMatchesAcrossPages() {
-        var page = userGameRepository.findOwnedGames(USER_ID, null, UserGameRepository.containsPattern("half"), null,
+        var page = userGameRepository.findOwnedGames(USER_ID, false, null, UserGameRepository.containsPattern("half"), null,
                 PageRequest.of(0, 1, Sort.by("appid")));
 
         assertEquals(List.of(220L), page.map(UserGame::getAppid).getContent());
@@ -144,7 +144,7 @@ class UserGameRepositoryTest extends AbstractPersistenceTest {
     }
 
     private List<Long> sortedAppids(Sort sort) {
-        return userGameRepository.findOwnedGames(USER_ID, null, null, null, PageRequest.of(0, 20, UserGameRepository.querySort(sort)))
+        return userGameRepository.findOwnedGames(USER_ID, false, null, null, null, PageRequest.of(0, 20, UserGameRepository.querySort(sort)))
                 .map(UserGame::getAppid).getContent();
     }
 
@@ -195,7 +195,7 @@ class UserGameRepositoryTest extends AbstractPersistenceTest {
                 new GameTimeToBeat(620L, 300, 480, 900, Instant.now()),
                 new GameTimeToBeat(380L, null, null, null, Instant.now())));
 
-        List<Long> shortGames = userGameRepository.findOwnedGames(USER_ID, null, null, 600, PAGE).map(UserGame::getAppid).getContent();
+        List<Long> shortGames = userGameRepository.findOwnedGames(USER_ID, false, null, null, 600, PAGE).map(UserGame::getAppid).getContent();
 
         assertEquals(List.of(620L), shortGames);
     }
@@ -210,6 +210,65 @@ class UserGameRepositoryTest extends AbstractPersistenceTest {
         assertEquals(350, userGameRepository.sumBacklogMinutes(USER_ID));
     }
 
+    private void hide(long... appids) {
+        for (long appid : appids) {
+            userGameRepository.findById(new UserGameId(USER_ID, appid)).orElseThrow().setHiddenAt(Instant.now());
+        }
+        userGameRepository.flush();
+    }
+
+    @Test
+    void hiddenGames_LeaveTheListAndShowOnlyUnderTheHiddenFilter() {
+        hide(620L, 700L);
+
+        assertEquals(List.of(220L, 380L), appids(null, null));
+        assertEquals(List.of(620L, 700L), userGameRepository.findOwnedGames(USER_ID, true, null, null, null,
+                PageRequest.of(0, 20, Sort.by("appid"))).map(UserGame::getAppid).getContent());
+        assertEquals(Set.of(620L, 700L), Set.copyOf(userGameRepository.findHiddenAppids(USER_ID)));
+    }
+
+    @Test
+    void hiddenGames_LeaveEveryCountAndSum() {
+        gameTimeToBeatRepository.saveAll(List.of(
+                new GameTimeToBeat(380L, 100, 200, 300, Instant.now()),
+                new GameTimeToBeat(700L, 100, 150, 300, Instant.now())));
+        userGameRepository.findById(new UserGameId(USER_ID, 220L)).orElseThrow().setPlaytime2Weeks(30);
+        userGameRepository.findById(new UserGameId(USER_ID, 620L)).orElseThrow().setPlaytime2Weeks(60);
+        hide(620L, 700L);
+
+        assertEquals(2, userGameRepository.countListed(USER_ID));
+        assertEquals(300, userGameRepository.sumPlaytime(USER_ID));
+        assertEquals(1, userGameRepository.countListedNeverPlayed(USER_ID));
+        assertEquals(200, userGameRepository.sumBacklogMinutes(USER_ID));
+        assertEquals(Set.of(new StatusCount(GameStatus.PLAYING, 1), new StatusCount(GameStatus.BACKLOG, 1)),
+                Set.copyOf(userGameRepository.countByStatus(USER_ID)));
+        assertEquals(List.of(380L), userGameRepository.findBacklogAppids(USER_ID));
+        assertEquals(List.of(220L), userGameRepository.findListedPlayedInTwoWeeks(USER_ID, PAGE)
+                .stream().map(UserGame::getAppid).toList());
+        assertEquals(List.of(220L), userGameRepository.findListedByStatusIn(USER_ID, List.of(GameStatus.PLAYING), PAGE)
+                .stream().map(UserGame::getAppid).toList());
+        assertEquals(Set.of(220L, 380L), Set.copyOf(userGameRepository.findAchievementProgress(USER_ID)
+                .stream().map(p -> p.appid()).toList()));
+    }
+
+    @Test
+    void hiddenGames_AreNeverPicked() {
+        hide(700L);
+
+        for (int i = 0; i < 5; i++) {
+            assertEquals(380L, userGameRepository.findRandomBacklogGame(USER_ID, -1).orElseThrow().getAppid());
+            assertEquals(List.of(380L), userGameRepository.findPickerGames(USER_ID, null, null, List.of(), 10)
+                    .stream().map(UserGame::getAppid).toList());
+        }
+    }
+
+    @Test
+    void findActiveAppids_StillSeesHiddenGames() {
+        hide(700L);
+
+        assertEquals(List.of(700L), userGameRepository.findActiveAppids(USER_ID, List.of(700L)));
+    }
+
     @Test
     void containsPattern_BlankIsNoFilter() {
         assertNull(UserGameRepository.containsPattern("  "));
@@ -235,7 +294,7 @@ class UserGameRepositoryTest extends AbstractPersistenceTest {
         userGameRepository.save(new UserGame(2L, 380L, 0, Instant.now(), Instant.now()));
         userGameRepository.flush();
 
-        assertEquals(1, userGameRepository.countByUserIdAndRemovedAtIsNullAndPlaytimeMinutes(USER_ID, 0));
+        assertEquals(1, userGameRepository.countListedNeverPlayed(USER_ID));
     }
 
     @Test
diff --git a/src/test/java/core_service/modules/library/service/AchievementSyncServiceTest.java b/src/test/java/core_service/modules/library/service/AchievementSyncServiceTest.java
index 197178c..7ad2ef2 100644
--- a/src/test/java/core_service/modules/library/service/AchievementSyncServiceTest.java
+++ b/src/test/java/core_service/modules/library/service/AchievementSyncServiceTest.java
@@ -124,6 +124,17 @@ class AchievementSyncServiceTest extends AbstractUnitTest {
         verifyNoInteractions(steamApiService);
     }
 
+    @Test
+    void syncLibrary_HiddenGame_AsksSteamNothing() {
+        UserGame hidden = game(620L, 120);
+        hidden.setHiddenAt(Instant.now());
+        library(List.of(hidden), List.of(), List.of());
+
+        service.syncLibrary(USER_ID, STEAM_ID);
+
+        verifyNoInteractions(steamApiService);
+    }
+
     @Test
     void syncLibrary_ChangedPlaytime_StoresUnlocksAndThePlaytime() {
         library(List.of(game(620L, 150)), List.of(schema(620L, 10)), List.of(unlocks(620L, 3, 120)));
diff --git a/src/test/java/core_service/modules/library/service/GameDetailServiceTest.java b/src/test/java/core_service/modules/library/service/GameDetailServiceTest.java
index cb3c6b4..5ead39e 100644
--- a/src/test/java/core_service/modules/library/service/GameDetailServiceTest.java
+++ b/src/test/java/core_service/modules/library/service/GameDetailServiceTest.java
@@ -7,6 +7,7 @@ import core_service.modules.library.domain.SteamGame;
 import core_service.modules.library.domain.GameStatus;
 import core_service.modules.library.domain.UserGame;
 import core_service.modules.library.domain.UserGameAchievementMeta;
+import core_service.modules.library.domain.UserGameId;
 import core_service.modules.library.repo.GameAchievementSchemaMetaRepository;
 import core_service.modules.library.repo.SteamGameRepository;
 import core_service.modules.library.repo.GameAchievementSchemaRepository;
@@ -104,6 +105,21 @@ class GameDetailServiceTest extends AbstractIntegrationTest {
         assertEquals(false, detail.hasAchievements());
     }
 
+    @Test
+    void getGameDetail_HiddenGame_ShowsStoredDataAndAsksNobody() {
+        UserGame hidden = userGameRepository.findById(new UserGameId(USER_ID, 620L)).orElseThrow();
+        hidden.setHiddenAt(Instant.now());
+        userGameRepository.save(hidden);
+        schemaMetaRepository.save(new GameAchievementSchemaMeta(620L, 1, true, Instant.now().minus(Duration.ofDays(31))));
+        schemaRepository.save(new GameAchievementSchema(620L, "A", "A", null, "icon", "gray", false));
+
+        GameDetailDto detail = gameDetailService.getGameDetail(USER_ID, STEAM_ID, 620L).orElseThrow();
+
+        org.mockito.Mockito.verifyNoInteractions(steamApiService, speedrunService, timeToBeatService, moodService);
+        assertEquals(true, detail.hidden());
+        assertEquals(1, detail.achievementsTotal());
+    }
+
     @Test
     void getGameDetail_GameAddedByHand_AsksForTheTimeToBeatAndMoodsAgain() {
         userGameRepository.save(UserGame.manual(USER_ID, 620L, "PS5", GameStatus.PLAYING, 60, Instant.now()));
diff --git a/src/test/java/core_service/modules/library/service/ImageRepairServiceTest.java b/src/test/java/core_service/modules/library/service/ImageRepairServiceTest.java
index 5c9f63d..e04cccb 100644
--- a/src/test/java/core_service/modules/library/service/ImageRepairServiceTest.java
+++ b/src/test/java/core_service/modules/library/service/ImageRepairServiceTest.java
@@ -80,7 +80,7 @@ class ImageRepairServiceTest extends AbstractUnitTest {
 
     @Test
     void report_StoresAReportForAnOwnedSteamGame() {
-        when(userGameRepository.findActiveAppids(1L, List.of(620L))).thenReturn(List.of(620L));
+        when(userGameRepository.findListedAppids(1L, List.of(620L))).thenReturn(List.of(620L));
 
         service.report(1L, 620L, ImageKind.COVER);
 
@@ -89,7 +89,7 @@ class ImageRepairServiceTest extends AbstractUnitTest {
 
     @Test
     void report_DropsGamesTheUserDoesNotOwn() {
-        when(userGameRepository.findActiveAppids(1L, List.of(620L))).thenReturn(List.of());
+        when(userGameRepository.findListedAppids(1L, List.of(620L))).thenReturn(List.of());
 
         service.report(1L, 620L, ImageKind.COVER);
 
diff --git a/src/test/java/core_service/modules/library/service/LibrarySyncWorkerTest.java b/src/test/java/core_service/modules/library/service/LibrarySyncWorkerTest.java
index 4c65876..d998c1b 100644
--- a/src/test/java/core_service/modules/library/service/LibrarySyncWorkerTest.java
+++ b/src/test/java/core_service/modules/library/service/LibrarySyncWorkerTest.java
@@ -419,6 +419,31 @@ class LibrarySyncWorkerTest extends AbstractUnitTest {
         verify(moodService).refresh(List.of(220L, -1025L));
     }
 
+    @Test
+    void runSync_KeepsTheHiddenFlagAndUpdatesThePlaytime() {
+        UserGame hidden = owned(60);
+        Instant hiddenAt = Instant.parse("2026-09-01T10:00:00Z");
+        hidden.setHiddenAt(hiddenAt);
+        steamReturns(game(90, 30), STEAM_ID);
+
+        worker.runSync(USER_ID, STEAM_ID);
+
+        assertEquals(hiddenAt, hidden.getHiddenAt());
+        assertEquals(90, hidden.getPlaytimeMinutes());
+        verify(playtimeDayRepository).addMinutes(USER_ID, 220L, today(), 30);
+    }
+
+    @Test
+    void runSync_HiddenGamesGetNoTimeToBeatOrMoods() {
+        steamReturns(game(0, 0), STEAM_ID);
+        when(userGameRepository.findHiddenAppids(USER_ID)).thenReturn(List.of(220L));
+
+        worker.runSync(USER_ID, STEAM_ID);
+
+        verify(timeToBeatService).refresh(List.of());
+        verify(moodService).refresh(List.of());
+    }
+
     @Test
     void runSync_GameWithoutName_GetsTheAppidAsName() {
         when(userSteamSyncRepository.tryClaimRun(eq(USER_ID), eq(STEAM_ID), any())).thenReturn(1);
diff --git a/src/test/java/core_service/modules/stats/repo/StatsRepositoryTest.java b/src/test/java/core_service/modules/stats/repo/StatsRepositoryTest.java
new file mode 100644
index 0000000..d7024a9
--- /dev/null
+++ b/src/test/java/core_service/modules/stats/repo/StatsRepositoryTest.java
@@ -0,0 +1,64 @@
+package core_service.modules.stats.repo;
+
+import core_service.modules.library.domain.SteamGame;
+import core_service.modules.library.domain.UserGame;
+import core_service.modules.library.repo.SteamGameRepository;
+import core_service.modules.library.repo.UserGameRepository;
+import core_service.shared.test.AbstractPersistenceTest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Import;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@Import(StatsRepository.class)
+class StatsRepositoryTest extends AbstractPersistenceTest {
+
+    @Autowired
+    private StatsRepository statsRepository;
+
+    @Autowired
+    private SteamGameRepository steamGameRepository;
+
+    @Autowired
+    private UserGameRepository userGameRepository;
+
+    @BeforeEach
+    void seed() {
+        userGameRepository.deleteAll();
+        steamGameRepository.saveAllAndFlush(List.of(new SteamGame(220L, "Half-Life 2", null, Instant.now()),
+                new SteamGame(1000L, "Playtest", null, Instant.now())));
+        UserGame hiddenPlaytest = new UserGame(1L, 1000L, 5000, Instant.now(), Instant.now());
+        hiddenPlaytest.setHiddenAt(Instant.now());
+        UserGame hiddenNeverPlayed = new UserGame(2L, 1000L, 0, Instant.now(), Instant.now());
+        hiddenNeverPlayed.setHiddenAt(Instant.now());
+        userGameRepository.saveAllAndFlush(List.of(new UserGame(1L, 220L, 300, Instant.now(), Instant.now()),
+                hiddenPlaytest, hiddenNeverPlayed));
+    }
+
+    @Test
+    void hiddenGames_LeaveEveryNumber() {
+        assertEquals(1, statsRepository.countDistinctGames());
+        assertEquals(1, statsRepository.countLibraryEntries());
+        assertEquals(1, statsRepository.countGamesPlayed());
+        assertEquals(300, statsRepository.sumPlaytimeMinutes());
+        assertEquals(1, statsRepository.countUsersWithLibrary());
+        assertEquals(1, statsRepository.biggestLibrary());
+        assertEquals(0, statsRepository.biggestBacklog());
+    }
+
+    @Test
+    void hiddenGames_LeaveTheTopLists() {
+        assertEquals(List.of(220L), appids(statsRepository.topOwnedGames(5)));
+        assertEquals(List.of(220L), appids(statsRepository.topPlayedGames(5)));
+    }
+
+    private static List<Long> appids(List<Map<String, Object>> rows) {
+        return rows.stream().map(row -> ((Number) row.get("appid")).longValue()).toList();
+    }
+}