Add round delete with confirmation dialog

- Add delete procedure to round tRPC router with cascade and audit log
- Add delete option to rounds list dropdown menu
- Show confirmation dialog with project/assignment counts before deletion

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(admin)/admin/rounds/page.tsx

@@ -1,8 +1,9 @@
 'use client'
 
-import { Suspense } from 'react'
+import { Suspense, useState } from 'react'
 import Link from 'next/link'
 import { trpc } from '@/lib/trpc/client'
+import { toast } from 'sonner'
 import {
   Card,
   CardContent,
@@ -28,6 +29,16 @@ import {
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from '@/components/ui/dropdown-menu'
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+} from '@/components/ui/alert-dialog'
 import {
   Plus,
   MoreHorizontal,
@@ -39,6 +50,8 @@ import {
   CheckCircle2,
   Clock,
   Archive,
+  Trash2,
+  Loader2,
 } from 'lucide-react'
 import { format, isPast, isFuture } from 'date-fns'
 
@@ -122,6 +135,7 @@ function RoundsContent() {
 
 function RoundRow({ round }: { round: any }) {
   const utils = trpc.useUtils()
+  const [showDeleteDialog, setShowDeleteDialog] = useState(false)
 
   const updateStatus = trpc.round.updateStatus.useMutation({
     onSuccess: () => {
@@ -129,6 +143,16 @@ function RoundRow({ round }: { round: any }) {
     },
   })
 
+  const deleteRound = trpc.round.delete.useMutation({
+    onSuccess: () => {
+      toast.success('Round deleted successfully')
+      utils.program.list.invalidate()
+    },
+    onError: (error) => {
+      toast.error(error.message || 'Failed to delete round')
+    },
+  })
+
   const getStatusBadge = () => {
     const now = new Date()
     const isVotingOpen =
@@ -284,8 +308,42 @@ function RoundRow({ round }: { round: any }) {
                 Archive Round
               </DropdownMenuItem>
             )}
+            <DropdownMenuSeparator />
+            <DropdownMenuItem
+              className="text-destructive focus:text-destructive"
+              onClick={() => setShowDeleteDialog(true)}
+            >
+              <Trash2 className="mr-2 h-4 w-4" />
+              Delete Round
+            </DropdownMenuItem>
           </DropdownMenuContent>
         </DropdownMenu>
+
+        <AlertDialog open={showDeleteDialog} onOpenChange={setShowDeleteDialog}>
+          <AlertDialogContent>
+            <AlertDialogHeader>
+              <AlertDialogTitle>Delete Round</AlertDialogTitle>
+              <AlertDialogDescription>
+                Are you sure you want to delete &quot;{round.name}&quot;? This will
+                permanently delete all {round._count?.projects || 0} projects,{' '}
+                {round._count?.assignments || 0} assignments, and all evaluations
+                in this round. This action cannot be undone.
+              </AlertDialogDescription>
+            </AlertDialogHeader>
+            <AlertDialogFooter>
+              <AlertDialogCancel>Cancel</AlertDialogCancel>
+              <AlertDialogAction
+                onClick={() => deleteRound.mutate({ id: round.id })}
+                className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
+              >
+                {deleteRound.isPending ? (
+                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+                ) : null}
+                Delete
+              </AlertDialogAction>
+            </AlertDialogFooter>
+          </AlertDialogContent>
+        </AlertDialog>
       </TableCell>
     </TableRow>
   )

src/server/routers/round.ts

@@ -341,6 +341,45 @@ export const roundRouter = router({
       })
     }),
 
+  /**
+   * Delete a round (admin only)
+   * Cascades to projects, assignments, evaluations, etc.
+   */
+  delete: adminProcedure
+    .input(z.object({ id: z.string() }))
+    .mutation(async ({ ctx, input }) => {
+      const round = await ctx.prisma.round.findUniqueOrThrow({
+        where: { id: input.id },
+        include: {
+          _count: { select: { projects: true, assignments: true } },
+        },
+      })
+
+      await ctx.prisma.round.delete({
+        where: { id: input.id },
+      })
+
+      // Audit log
+      await ctx.prisma.auditLog.create({
+        data: {
+          userId: ctx.user.id,
+          action: 'DELETE',
+          entityType: 'Round',
+          entityId: input.id,
+          detailsJson: {
+            name: round.name,
+            status: round.status,
+            projectsDeleted: round._count.projects,
+            assignmentsDeleted: round._count.assignments,
+          },
+          ipAddress: ctx.ip,
+          userAgent: ctx.userAgent,
+        },
+      })
+
+      return round
+    }),
+
   /**
    * Check if a round has any submitted evaluations
    */