feat: add bgp observability and admin ui improvements

backend/app/core/time.py

@@ -0,0 +1,20 @@
+"""Time helpers for API serialization."""
+
+from __future__ import annotations
+
+from datetime import UTC, datetime
+
+
+def ensure_utc(value: datetime | None) -> datetime | None:
+    if value is None:
+        return None
+    if value.tzinfo is None:
+        return value.replace(tzinfo=UTC)
+    return value.astimezone(UTC)
+
+
+def to_iso8601_utc(value: datetime | None) -> str | None:
+    normalized = ensure_utc(value)
+    if normalized is None:
+        return None
+    return normalized.isoformat().replace("+00:00", "Z")