Enable grouped alert view with security considerations

Update: implement grouped_alerts_view migration and address security definer concerns by noting default SECURITY INVOKER behavior for views and ensuring RLS policies on underlying tables apply. This commit covers the view creation and related security clarifications for alert grouping feature.

src/integrations/supabase/types.ts

@@ -5935,6 +5935,24 @@ export type Database = {
         }
         Relationships: []
       }
+      grouped_alerts_view: {
+        Row: {
+          alert_count: number | null
+          alert_ids: string[] | null
+          alert_type: string | null
+          first_seen: string | null
+          function_name: string | null
+          group_key: string | null
+          has_resolved: boolean | null
+          last_seen: string | null
+          messages: string[] | null
+          metric_type: string | null
+          severity: string | null
+          source: string | null
+          unresolved_count: number | null
+        }
+        Relationships: []
+      }
       idempotency_stats: {
         Row: {
           avg_duration_ms: number | null