fix(library): count trend never played by set total

Nightly snapshot and live trend point use the set total, as stats do.
Newest point now equals stats "never started". Old rows keep old value.
Refs #43

src/main/java/core_service/modules/library/repo/BacklogSnapshotRepository.java

@@ -12,6 +12,7 @@ import java.util.List;
 
 /**
  * The daily pile size per user, table backlog_snapshot. Counts listed games only, like {@link UserGameRepository#LISTED}, and a linked set once (V28).
+ * Never played is judged by the set total (V45), like {@link UserGameRepository#countListedNeverPlayed}.
  */
 @Repository
 @RequiredArgsConstructor
@@ -19,11 +20,12 @@ public class BacklogSnapshotRepository {
 
     private static final String PILE_COLUMNS = """
             count(*) filter (where ug.status = 'BACKLOG' and cg.appid is null) as backlog_games,
-            count(*) filter (where ug.playtime_minutes = 0) as never_played,
+            count(*) filter (where ep.playtime_minutes = 0) as never_played,
             coalesce(sum(t.normally_minutes) filter (where ug.status = 'BACKLOG' and cg.appid is null), 0) as backlog_minutes,
             count(*) as listed_games
             from counted_user_game ug left join game_time_to_beat t on t.appid = ug.appid
             left join coming_game cg on cg.appid = ug.appid
+            left join user_game_entry_playtime ep on ep.user_id = ug.user_id and ep.appid = ug.appid
             """;
 
     private final NamedParameterJdbcTemplate jdbc;

src/test/java/core_service/modules/library/repo/BacklogSnapshotRepositoryTest.java

@@ -86,6 +86,30 @@ class BacklogSnapshotRepositoryTest extends AbstractPersistenceTest {
         assertThat(repository.findSince(1L, DAY)).containsExactly(new UserStats.PileDay(DAY, 1, 1, 600));
     }
 
+    private void psnPlay(long appid, int minutes) {
+        jdbc.update("insert into user_psn_title (user_id, psn_key, state, appid, platform, playtime_minutes) "
+                + "values (1, ?, 'STEAM_OWNED', ?, 'PS5', ?)", "c" + appid, appid, minutes);
+    }
+
+    @Test
+    void writeAll_ASetPlayedOnlyOnPlayStationIsNotNeverPlayed() {
+        userGameRepository.saveAllAndFlush(List.of(game(1L, 220L, 0, GameStatus.BACKLOG), game(1L, 620L, 0, GameStatus.BACKLOG)));
+        psnPlay(220L, 120);
+
+        repository.writeAll(DAY);
+
+        assertThat(repository.findSince(1L, DAY)).extracting(UserStats.PileDay::neverPlayed).containsExactly(1L);
+        assertThat(userGameRepository.countListedNeverPlayed(1L)).isEqualTo(1);
+    }
+
+    @Test
+    void live_UsesTheSetTotal() {
+        userGameRepository.saveAllAndFlush(List.of(game(1L, 220L, 0, GameStatus.BACKLOG), game(1L, 620L, 0, GameStatus.BACKLOG)));
+        psnPlay(220L, 120);
+
+        assertThat(repository.live(1L, DAY).neverPlayed()).isEqualTo(1).isEqualTo(userGameRepository.countListedNeverPlayed(1L));
+    }
+
     @Test
     void writeAll_SecondRunOnTheSameDay_ReplacesTheRow() {
         UserGame game = game(1L, 220L, 0, GameStatus.BACKLOG);