Refactor scheduler module and enhance scheduled message handling

- Updated `SchedulerValidationError` to include error codes for better error management.
- Renamed functions for clarity: `listSchedules` to `listScheduledMessagesDashboard` and `createSchedule` to `createScheduledMessageDashboard`.
- Improved validation logic for cron expressions and scheduling times.
- Enhanced the `deleteSchedule` function to ensure proper handling of existing scheduled messages.
- Adjusted database query order and limits for better performance in fetching scheduled messages.

apps/webui/src/app/api/guilds/[guildId]/scheduler/[scheduleId]/route.ts

@@ -0,0 +1,32 @@
+import { type NextRequest, NextResponse } from 'next/server';
+import { requireGuildAccess, toApiErrorResponse } from '@/lib/auth';
+import { writeDashboardAudit } from '@/lib/audit';
+import { deleteScheduledMessageDashboard } from '@/lib/module-configs/scheduler';
+import { prisma } from '@/lib/prisma';
+
+interface RouteParams {
+  params: Promise<{ guildId: string; scheduleId: string }>;
+}
+
+export async function DELETE(_request: NextRequest, { params }: RouteParams) {
+  const { guildId, scheduleId } = await params;
+  try {
+    const session = await requireGuildAccess(guildId);
+    const deleted = await deleteScheduledMessageDashboard(guildId, scheduleId);
+    if (!deleted) {
+      return NextResponse.json({ error: 'Schedule not found' }, { status: 404 });
+    }
+
+    await writeDashboardAudit(prisma, {
+      guildId,
+      actorUserId: session.user.id,
+      action: 'scheduler.delete',
+      path: `/dashboard/${guildId}/scheduler`,
+      before: { id: scheduleId }
+    });
+
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return toApiErrorResponse(error);
+  }
+}

apps/webui/src/app/api/guilds/[guildId]/scheduler/route.ts

@@ -0,0 +1,51 @@
+import { ScheduledMessageDashboardCreateSchema } from '@nexumi/shared';
+import { type NextRequest, NextResponse } from 'next/server';
+import { requireGuildAccess, toApiErrorResponse } from '@/lib/auth';
+import { writeDashboardAudit } from '@/lib/audit';
+import {
+  createScheduledMessageDashboard,
+  listScheduledMessagesDashboard,
+  SchedulerValidationError
+} from '@/lib/module-configs/scheduler';
+import { prisma } from '@/lib/prisma';
+
+interface RouteParams {
+  params: Promise<{ guildId: string }>;
+}
+
+export async function GET(_request: NextRequest, { params }: RouteParams) {
+  const { guildId } = await params;
+  try {
+    await requireGuildAccess(guildId);
+    const schedules = await listScheduledMessagesDashboard(guildId);
+    return NextResponse.json({ schedules });
+  } catch (error) {
+    return toApiErrorResponse(error);
+  }
+}
+
+export async function POST(request: NextRequest, { params }: RouteParams) {
+  const { guildId } = await params;
+  try {
+    const session = await requireGuildAccess(guildId);
+    const body = await request.json();
+    const input = ScheduledMessageDashboardCreateSchema.parse(body);
+
+    const schedule = await createScheduledMessageDashboard(guildId, session.user.id, input);
+
+    await writeDashboardAudit(prisma, {
+      guildId,
+      actorUserId: session.user.id,
+      action: 'scheduler.create',
+      path: `/dashboard/${guildId}/scheduler`,
+      after: schedule
+    });
+
+    return NextResponse.json(schedule, { status: 201 });
+  } catch (error) {
+    if (error instanceof SchedulerValidationError) {
+      return NextResponse.json({ error: error.code }, { status: 400 });
+    }
+    return toApiErrorResponse(error);
+  }
+}