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Fix security definer view issue by enabling security_invoker on grouped_alerts_view and implement grouped alerts system with new keys, hooks, components, and monitoring overview integration. Added migration to adjust view, updated query keys, created useGroupedAlerts, useAlertGroupActions, GroupedAlertsPanel, and updated MonitoringOverview to include grouped alerts.

src/lib/queryKeys.ts

@@ -89,5 +89,8 @@ export const queryKeys = {
     combinedAlerts: () => ['monitoring', 'combined-alerts'] as const,
     databaseHealth: () => ['monitoring', 'database-health'] as const,
     moderationHealth: () => ['monitoring', 'moderation-health'] as const,
+    groupedAlerts: (options?: { includeResolved?: boolean; minCount?: number; severity?: string }) => 
+      ['monitoring', 'grouped-alerts', options] as const,
+    alertGroupDetails: (groupKey: string) => ['monitoring', 'alert-group-details', groupKey] as const,
   },
 } as const;