fix: harden admin and CMPP delivery workflows

api/src/dictionaries/dictionaries.service.ts

@@ -97,6 +97,10 @@ export class DictionariesService {
     return this.prisma.phoneSegment.create({ data });
   }
 
+  deletePhoneSegment(id: string) {
+    return this.prisma.phoneSegment.delete({ where: { id } });
+  }
+
   async listPhoneCarrierRules(query: PageQuery = {}) {
     const page = Math.max(1, Number(query.page ?? 1));
     const pageSize = Math.min(100, Math.max(1, Number(query.pageSize ?? 25)));
@@ -258,8 +262,12 @@ export class DictionariesService {
     return updated;
   }
 
-  listDrainageFields() {
-    return this.prisma.drainageField.findMany({ orderBy: { createdAt: 'desc' } });
+  async listDrainageFields() {
+    const fields = await this.prisma.drainageField.findMany({
+      include: { _count: { select: { channelReportFields: true } } },
+      orderBy: { createdAt: 'desc' },
+    });
+    return fields.map(({ _count, ...field }) => ({ ...field, usageCount: _count.channelReportFields }));
   }
 
   createDrainageField(data: CreateDrainageFieldDto) {
@@ -282,6 +290,14 @@ export class DictionariesService {
     });
   }
 
+  async deleteDrainageField(id: string) {
+    const usageCount = await this.prisma.channelReportField.count({ where: { drainageFieldId: id } });
+    if (usageCount > 0) {
+      throw new BadRequestException(`该字段已被 ${usageCount} 个通道使用，不能删除`);
+    }
+    return this.prisma.drainageField.delete({ where: { id } });
+  }
+
   private writeOperationLog(userId: string | undefined, action: string, resource: string, resourceId: string, detail: Record<string, unknown>) {
     return this.prisma.operationLog.create({
       data: {