Add clear stuck jobs admin feature and simplify worker scheduling

- Add POST /api/admin/settings/clear-stuck-jobs endpoint to clear
  stuck/failed asynq worker jobs from Redis (retry queue, archived,
  orphaned task metadata)
- Add "Clear Stuck Jobs" button to admin settings UI
- Remove TASK_REMINDER_MINUTE config - all jobs now run at minute 0
- Simplify formatCron to only take hour parameter
- Update default notification times to CST-friendly hours

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

admin/src/app/(dashboard)/settings/page.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useMutation } from '@tanstack/react-query';
-import { Database, TestTube, Trash2 } from 'lucide-react';
+import { Database, TestTube, Trash2, RefreshCw } from 'lucide-react';
 
 import { settingsApi } from '@/lib/api';
 import { Button } from '@/components/ui/button';
@@ -56,6 +56,20 @@ export default function SettingsPage() {
     },
   });
 
+  const clearStuckJobsMutation = useMutation({
+    mutationFn: settingsApi.clearStuckJobs,
+    onSuccess: (data) => {
+      if (data.keys_deleted > 0) {
+        toast.success(`${data.message} (${data.keys_deleted} keys cleared)`);
+      } else {
+        toast.info('No stuck jobs found');
+      }
+    },
+    onError: () => {
+      toast.error('Failed to clear stuck jobs');
+    },
+  });
+
   return (
     <div className="p-6 space-y-6">
       <div>
@@ -163,6 +177,53 @@ export default function SettingsPage() {
           </CardContent>
         </Card>
 
+        {/* Clear Stuck Jobs */}
+        <Card>
+          <CardHeader>
+            <CardTitle className="flex items-center gap-2">
+              <RefreshCw className="h-5 w-5" />
+              Clear Stuck Jobs
+            </CardTitle>
+            <CardDescription>
+              Clear stuck or failed background worker jobs from Redis
+            </CardDescription>
+          </CardHeader>
+          <CardContent>
+            <AlertDialog>
+              <AlertDialogTrigger asChild>
+                <Button
+                  variant="outline"
+                  disabled={clearStuckJobsMutation.isPending}
+                >
+                  {clearStuckJobsMutation.isPending ? 'Clearing...' : 'Clear Stuck Jobs'}
+                </Button>
+              </AlertDialogTrigger>
+              <AlertDialogContent>
+                <AlertDialogHeader>
+                  <AlertDialogTitle>Clear Stuck Jobs?</AlertDialogTitle>
+                  <AlertDialogDescription>
+                    This will clear stuck/failed worker jobs from Redis including:
+                    <ul className="list-disc list-inside mt-2 space-y-1">
+                      <li>Jobs in the retry queue</li>
+                      <li>Archived/dead letter jobs</li>
+                      <li>Orphaned task metadata</li>
+                    </ul>
+                    <span className="block mt-2">
+                      This is safe to run and can fix issues with notifications not running at expected times.
+                    </span>
+                  </AlertDialogDescription>
+                </AlertDialogHeader>
+                <AlertDialogFooter>
+                  <AlertDialogCancel>Cancel</AlertDialogCancel>
+                  <AlertDialogAction onClick={() => clearStuckJobsMutation.mutate()}>
+                    Clear Stuck Jobs
+                  </AlertDialogAction>
+                </AlertDialogFooter>
+              </AlertDialogContent>
+            </AlertDialog>
+          </CardContent>
+        </Card>
+
         {/* Clear All Data */}
         <Card className="border-destructive">
           <CardHeader>

admin/src/lib/api.ts

@@ -684,6 +684,11 @@ export const settingsApi = {
     const response = await api.post<{ message: string; users_deleted: number; preserved_users: number }>('/settings/clear-all-data');
     return response.data;
   },
+
+  clearStuckJobs: async (): Promise<{ message: string; keys_deleted: number; deleted_keys: string[] }> => {
+    const response = await api.post<{ message: string; keys_deleted: number; deleted_keys: string[] }>('/settings/clear-stuck-jobs');
+    return response.data;
+  },
 };
 
 // Limitations types