feat: add bgp observability and admin ui improvements

backend/app/api/v1/dashboard.py

@@ -1,6 +1,6 @@
 """Dashboard API with caching and optimizations"""
 
-from datetime import datetime, timedelta
+from datetime import UTC, datetime, timedelta
 from fastapi import APIRouter, Depends
 from sqlalchemy import select, func, text
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -13,6 +13,7 @@ from app.models.alert import Alert, AlertSeverity
 from app.models.task import CollectionTask
 from app.core.security import get_current_user
 from app.core.cache import cache
+from app.core.time import to_iso8601_utc
 
 
 # Built-in collectors info (mirrored from datasources.py)
@@ -111,7 +112,7 @@ async def get_stats(
     if cached_result:
         return cached_result
 
-    today_start = datetime.utcnow().replace(hour=0, minute=0, second=0, microsecond=0)
+    today_start = datetime.now(UTC).replace(hour=0, minute=0, second=0, microsecond=0)
 
     # Count built-in collectors
     built_in_count = len(COLLECTOR_INFO)
@@ -175,7 +176,7 @@ async def get_stats(
         "active_datasources": active_datasources,
         "tasks_today": tasks_today,
         "success_rate": round(success_rate, 1),
-        "last_updated": datetime.utcnow().isoformat(),
+        "last_updated": to_iso8601_utc(datetime.now(UTC)),
         "alerts": {
             "critical": critical_alerts,
             "warning": warning_alerts,
@@ -230,10 +231,10 @@ async def get_summary(
         summary[module] = {
             "datasources": data["datasources"],
             "total_records": 0,  # Built-in don't track this in dashboard stats
-            "last_updated": datetime.utcnow().isoformat(),
+            "last_updated": to_iso8601_utc(datetime.now(UTC)),
         }
 
-    response = {"modules": summary, "last_updated": datetime.utcnow().isoformat()}
+    response = {"modules": summary, "last_updated": to_iso8601_utc(datetime.now(UTC))}
 
     cache.set(cache_key, response, expire_seconds=300)