adding support for appsumo codes

dashboard/server/services/AppsumoService.ts

@@ -0,0 +1,13 @@
+
+
+import { AppsumoCodeModel } from '@schema/AppsumoCode'
+
+export async function checkAppsumoCode(code: string) {
+    const target = await AppsumoCodeModel.exists({ code, used_at: { $exists: false } });
+    return target;
+}
+
+
+export async function useAppsumoCode(code: string) {
+    await AppsumoCodeModel.updateOne({ code }, { used_at: Date.now() });
+}