feat: add live replays and PostgreSQL maintenance tools

- Stream compact live replay updates across local and clustered dashboards.
- Render responsive snake bodies as SVG paths with aligned custom icons.
- Add cache-busted assets, replay fallback routes, and live-follow playback.
- Support PostgreSQL benchmark sampling and idempotent SQLite migration.
- Add dry-run cleanup for old low-quality PostgreSQL replay payloads.
- Reward safe perimeter lanes and bump Prism to version 1.5.0.
- Add backend, migration, dashboard, and perimeter regression coverage.

tests/test_DashboardQuery.py

@@ -0,0 +1,59 @@
+import unittest
+from unittest.mock import AsyncMock
+
+from server.services.dashboard_query import DashboardQueryService
+
+class _Logger:
+  def warning(self, message):
+    return message
+
+class TestDashboardQueryService(unittest.IsolatedAsyncioTestCase):
+  def setUp(self):
+    self.database = AsyncMock()
+    self.hub = AsyncMock()
+    self.service = DashboardQueryService(
+      gameplay_database=self.database,
+      ws_hub=self.hub,
+      logger=_Logger(),
+      dashboard_running_game_stale_sec=600,
+    )
+
+  async def test_pushes_compact_latest_turn_event(self):
+    self.database.get_game_replay.return_value = {
+      "game": {"game_id": "game-1", "status": "running"},
+      "turns": [{"turn": 1}, {"turn": 2, "my_move": "up"}],
+    }
+
+    await self.service.push_dashboard_game_replay_update("game-1")
+
+    payload = self.hub.broadcast_payload.await_args.args[0]
+    self.assertEqual(payload["type"], "dashboard_game_replay_update")
+    self.assertEqual(payload["game_id"], "game-1")
+    self.assertEqual(payload["turn"], {"turn": 2, "my_move": "up"})
+    self.assertNotIn("turns", payload)
+
+  async def test_publishes_game_id_for_cluster_live_updates(self):
+    self.database.get_game_replay.return_value = {
+      "game": {"game_id": "game-1", "status": "running"},
+      "turns": [{"turn": 3}],
+    }
+    publish = AsyncMock()
+    self.service.set_publish_notice(publish)
+
+    await self.service.push_dashboard_game_replay_update("game-1")
+
+    publish.assert_awaited_once_with("game_turn", "game-1")
+
+  async def test_remote_turn_notice_loads_and_broadcasts_turn(self):
+    self.database.get_game_replay.return_value = {
+      "game": {"game_id": "game-1", "status": "running"},
+      "turns": [{"turn": 4}],
+    }
+
+    await self.service.on_dashboard_games_update_notice("game_turn", "game-1")
+
+    payload = self.hub.broadcast_payload.await_args.args[0]
+    self.assertEqual(payload["turn"]["turn"], 4)
+
+if __name__ == "__main__":
+  unittest.main()