feat: add option to disable pixel placement

polylan_submitter/place/admin.py

@@ -7,8 +7,8 @@ from .models import PixelPlacement, PlaceSettings
 
 @admin.register(PlaceSettings)
 class PlaceSettingsAdmin(DjangoObjectActions, admin.ModelAdmin):
-    list_display = ("event", "width", "height")
-    list_editable = ("width", "height")
+    list_display = ("event", "width", "height", "placement_enabled")
+    list_editable = ("width", "height", "placement_enabled")
     list_filter = ("event",)
     change_actions = ("resync_canvas",)
 

polylan_submitter/place/consumers.py

@@ -45,6 +45,10 @@ class PlaceConsumer(AsyncWebsocketConsumer):
             await self.send(text_data=encode("r", "a"))
             return
 
+        if not place_settings.placement_enabled:
+            await self.send(text_data=encode("r", "d"))
+            return
+
         parts = text_data.split("|")
         if len(parts) != 4:
             await self.send(text_data=encode("r", "i"))
@@ -142,6 +146,7 @@ class PlaceConsumer(AsyncWebsocketConsumer):
             next_placement_at,
             place_settings.width,
             place_settings.height,
+            int(place_settings.placement_enabled),
         )
 
     @database_sync_to_async
@@ -152,4 +157,11 @@ class PlaceConsumer(AsyncWebsocketConsumer):
         await self.send(text_data=encode("p", event["x"], event["y"], event["c"]))
 
     async def settings_changed(self, event):
-        await self.send(text_data=encode("e", event["width"], event["height"]))
+        await self.send(
+            text_data=encode(
+                "e",
+                event["width"],
+                event["height"],
+                int(event["placement_enabled"]),
+            )
+        )

polylan_submitter/place/migrations/0002_placesettings_placement_enabled.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.5 on 2026-10-25 09:31
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("place", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="placesettings",
+            name="placement_enabled",
+            field=models.BooleanField(default=True),
+        ),
+    ]

polylan_submitter/place/models.py

@@ -47,6 +47,9 @@ 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)
 
     def __str__(self):
         return f"PlaceSettings({self.event}, size={self.width}x{self.height})"

polylan_submitter/place/signals.py

@@ -1,11 +1,12 @@
-"""Reacts to an admin editing a PlaceSettings row (grid size) by:
+"""Reacts to an admin editing a PlaceSettings row (grid size, placement
+toggle) by:
 
 1. Rebuilding that event's Redis canvas from history at the (possibly new)
    dimensions - a resize invalidates the old Redis bytes (wrong length,
    wrong meaning), so this keeps Redis self-healing instead of relying on
    the admin remembering to click "Resync canvas from DB" after every
    resize.
-2. Pushing the new size to that event's already-connected clients. Unlike
+2. Pushing the new settings to that event's already-connected clients. Unlike
    the clock app, place has no periodic heartbeat broadcast to piggyback
    this onto, so it's broadcast explicitly here instead.
 """
@@ -33,5 +34,6 @@ def on_settings_saved(sender, instance, **kwargs):
             "type": "settings_changed",
             "width": instance.width,
             "height": instance.height,
+            "placement_enabled": instance.placement_enabled,
         },
     )

polylan_submitter/place/wire.py

@@ -6,8 +6,10 @@ either). Each message is a short string: a one-letter type tag followed by
 '|'-separated fields, in a fixed order the client already knows from this
 table:
 
-    s|<next>|<width>|<height>    initial personal state, once per connection
-                           (next = epoch ms cooldown ends, or empty if free now)
+    s|<next>|<width>|<height>|<on>
+                           initial personal state, once per connection
+                           (next = epoch ms cooldown ends, or empty if free now;
+                           on = 1 if placing pixels is allowed, 0 if frozen)
     p|<x>|<y>|<c>          a pixel was placed - broadcast to everyone,
                            including the placer (no separate ack needed)
     k|<next>               your own placement was accepted; carries your
@@ -15,10 +17,13 @@ table:
     r|c|<next>             rejected: still on cooldown
     r|a                    rejected: not logged in
     r|i                    rejected: invalid x/y/color
-    e|<width>|<height>     an admin resized the grid for this event -
-                           broadcast to everyone. A client that sees this
-                           should re-fetch /api/.../place/canvas rather than
-                           try to remap its local pixels.
+    r|d                    rejected: placement is disabled by an admin
+    e|<width>|<height>|<on>
+                           an admin edited this event's settings (grid size
+                           and/or placement toggle) - broadcast to everyone.
+                           If the size changed, a client should re-fetch
+                           /api/.../place/canvas rather than try to remap its
+                           local pixels.
 
 Client -> server has exactly one message shape, the same as the broadcast:
 p|<x>|<y>|<c>