fix(sync): keep old playtime off the day a game shows up

A game the sync saw for the first time put its whole playtime on that
day (40 h "longest gaming day" after skip_unvetted_apps=0). Growth now
counts at most Steam's last two weeks, and one game gets at most 24 h
per day. V18 drops the bad rows and caps old ones.

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

@@ -35,6 +35,16 @@ class PlaytimeDayRepositoryTest extends AbstractPersistenceTest {
         assertEquals(List.of(new DayMinutes(DAY, 75)), playtimeDayRepository.minutesPerDay(USER_ID, DAY));
     }
 
+    @Test
+    void addMinutes_OneGameGetsAtMostOneDay() {
+        playtimeDayRepository.addMinutes(USER_ID, 220L, DAY, 2378);
+        playtimeDayRepository.addMinutes(USER_ID, 620L, DAY.plusDays(1), 1400);
+        playtimeDayRepository.addMinutes(USER_ID, 620L, DAY.plusDays(1), 180);
+
+        assertEquals(List.of(new DayMinutes(DAY, 1440), new DayMinutes(DAY.plusDays(1), 1440)),
+                playtimeDayRepository.minutesPerDay(USER_ID, DAY));
+    }
+
     @Test
     void minutesPerDay_SumsAllGamesOfTheUserFromTheGivenDay() {
         playtimeDayRepository.addMinutes(USER_ID, 220L, DAY.minusDays(1), 999);

src/test/java/core_service/modules/library/service/LibrarySyncWorkerTest.java

@@ -290,6 +290,46 @@ class LibrarySyncWorkerTest extends AbstractUnitTest {
         verify(playtimeDayRepository).addMinutes(USER_ID, 220L, today(), 45);
     }
 
+    @Test
+    void runSync_NewGameWithOldPlaytime_RecordsOnlyTheLastTwoWeeks() {
+        steamReturns(game(2378, 30), STEAM_ID);
+
+        worker.runSync(USER_ID, STEAM_ID);
+
+        verify(playtimeDayRepository).addMinutes(USER_ID, 220L, today(), 30);
+    }
+
+    @Test
+    void runSync_NewGameNotPlayedForTwoWeeks_RecordsNothingAndLeavesThePileAlone() {
+        steamReturns(game(2378, 0), STEAM_ID);
+
+        worker.runSync(USER_ID, STEAM_ID);
+
+        verify(playtimeDayRepository, never()).addMinutes(anyLong(), anyLong(), any(), anyInt());
+        verify(userGameRepository, never()).playFromPileIfUntouched(anyLong(), any());
+    }
+
+    @Test
+    void runSync_GrowthOverManyDays_RecordsAtMostTheLastTwoWeeks() {
+        owned(100);
+        steamReturns(game(1000, 60), STEAM_ID);
+
+        worker.runSync(USER_ID, STEAM_ID);
+
+        verify(playtimeDayRepository).addMinutes(USER_ID, 220L, today(), 60);
+    }
+
+    @Test
+    void runSync_GrowthOlderThanTwoWeeks_RecordsNothingButTakesTheGameFromThePile() {
+        owned(100);
+        steamReturns(game(160, 0), STEAM_ID);
+
+        worker.runSync(USER_ID, STEAM_ID);
+
+        verify(playtimeDayRepository, never()).addMinutes(anyLong(), anyLong(), any(), anyInt());
+        verify(userGameRepository).playFromPileIfUntouched(USER_ID, List.of(220L));
+    }
+
     @Test
     void runSync_FirstSync_IsOnlyTheBaseline() {
         steamReturns(game(5000, 60), null);