feat: add bgp observability and admin ui improvements

backend/app/api/v1/settings.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import UTC, datetime
 from typing import Optional
 
 from fastapi import APIRouter, Depends, HTTPException
@@ -7,6 +7,7 @@ from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.security import get_current_user
+from app.core.time import to_iso8601_utc
 from app.db.session import get_db
 from app.models.datasource import DataSource
 from app.models.system_setting import SystemSetting
@@ -114,9 +115,9 @@ def serialize_collector(datasource: DataSource) -> dict:
         "frequency_minutes": datasource.frequency_minutes,
         "frequency": format_frequency_label(datasource.frequency_minutes),
         "is_active": datasource.is_active,
-        "last_run_at": datasource.last_run_at.isoformat() if datasource.last_run_at else None,
+        "last_run_at": to_iso8601_utc(datasource.last_run_at),
         "last_status": datasource.last_status,
-        "next_run_at": datasource.next_run_at.isoformat() if datasource.next_run_at else None,
+        "next_run_at": to_iso8601_utc(datasource.next_run_at),
     }
 
 
@@ -216,5 +217,5 @@ async def get_all_settings(
         "notifications": await get_setting_payload(db, "notifications"),
         "security": await get_setting_payload(db, "security"),
         "collectors": [serialize_collector(datasource) for datasource in datasources],
-        "generated_at": datetime.utcnow().isoformat() + "Z",
-    }
+        "generated_at": to_iso8601_utc(datetime.now(UTC)),
+    }