fix: enforce drainage uniqueness and carrier-specific reporting

api/src/send-chain/drainage-authorization.ts

@@ -1,4 +1,5 @@
 import { BadRequestException, ServiceUnavailableException } from '@nestjs/common';
+import { selectDrainageReportTask } from '../common/drainage-report-task';
 import { isIP } from 'node:net';
 import { parse } from 'tldts';
 import type { PrismaService } from '../prisma/prisma.service';
@@ -19,7 +20,7 @@ export type DrainageMaterial = {
   url: string;
   auditStatus: string;
   materialVersion: number;
-  reportTasks: Array<{ id: string; channelId: string; carrier: string | null; status: string }>;
+  reportTasks: Array<{ id: string; channelId: string; carrier: string | null; approvalScope?: string; status: string }>;
 };
 export type DrainageAssessment = {
   version: string;
@@ -138,8 +139,9 @@ export function assessDrainage(
     }
     const channels = new Set(
       approved.flatMap((item) =>
-        item.reportTasks
-          .filter((task) => task.status === 'approved' && (!task.carrier || !carrier || task.carrier === carrier))
+        [...new Set(item.reportTasks.map((task) => task.channelId))]
+          .map((channelId) => selectDrainageReportTask(item.reportTasks, channelId, carrier))
+          .filter((task): task is NonNullable<typeof task> => task?.status === 'approved')
           .map((task) => task.channelId),
       ),
     );