feat: Add new status page

hnsdoh_status/store.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+from collections import defaultdict, deque
+from datetime import datetime, timezone
+
+from hnsdoh_status.models import CheckResult, ProtocolName, Snapshot
+
+
+class StatusStore:
+    def __init__(self, history_size: int):
+        self._history_size = history_size
+        self._current: Snapshot | None = None
+        self._history: dict[str, deque[dict[ProtocolName, CheckResult]]] = defaultdict(
+            lambda: deque(maxlen=self._history_size)
+        )
+
+    def update(self, snapshot: Snapshot) -> None:
+        self._current = snapshot
+        for node in snapshot.nodes:
+            # Each history entry stores one full protocol result set for the node.
+            self._history[node.ip].append(dict(node.results))
+
+    def current(self) -> Snapshot | None:
+        return self._current
+
+    def history(self) -> dict[str, list[dict[ProtocolName, CheckResult]]]:
+        return {ip: list(entries) for ip, entries in self._history.items()}
+
+    def generated_at(self) -> datetime:
+        return datetime.now(timezone.utc)