feat(place): final end time + destruction wave

polylan_submitter/place/models.py

@@ -1,5 +1,6 @@
 from django.conf import settings
 from django.db import models
+from django.utils import timezone
 
 from events.models import Event
 from events.scoping import EventScopedManager
@@ -47,13 +48,22 @@ class PlaceSettings(models.Model):
     )
     width = models.PositiveSmallIntegerField(default=DEFAULT_GRID_WIDTH)
     height = models.PositiveSmallIntegerField(default=DEFAULT_GRID_HEIGHT)
-    # Freezes the board without taking the game down: clients can still
-    # connect and watch, but every placement is rejected.
-    placement_enabled = models.BooleanField(default=True)
+    # Past this, the game is over without taking it down: every placement
+    # is rejected and the board is shown wiped (see tasks.py). Only visual -
+    # the PixelPlacement history and the Redis canvas are kept as-is, so
+    # admin stats/heatmaps still see the final board. Empty = no end.
+    placement_ends_at = models.DateTimeField(null=True, blank=True)
 
     def __str__(self):
         return f"PlaceSettings({self.event}, size={self.width}x{self.height})"
 
+    @property
+    def placement_ended(self) -> bool:
+        return (
+            self.placement_ends_at is not None
+            and self.placement_ends_at <= timezone.now()
+        )
+
     @classmethod
     def current(cls, event: Event) -> "PlaceSettings":
         obj, _ = cls.objects.get_or_create(event=event)