fix: resolves issues

src/admin/dto/pagination.dto.ts

@@ -0,0 +1,30 @@
+import { IsOptional, IsInt, Min, Max, IsString, IsIn } from 'class-validator';
+import { Type } from 'class-transformer';
+import { ApiPropertyOptional } from '@nestjs/swagger';
+
+export class PaginationDto {
+  @ApiPropertyOptional({ default: 1 })
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  page?: number = 1;
+
+  @ApiPropertyOptional({ default: 20 })
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  @Max(100)
+  limit?: number = 20;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  sortBy?: string;
+
+  @ApiPropertyOptional({ enum: ['ASC', 'DESC'], default: 'ASC' })
+  @IsOptional()
+  @IsIn(['ASC', 'DESC'])
+  sortOrder?: 'ASC' | 'DESC' = 'ASC';
+}

src/audit/audit-export.service.ts

@@ -0,0 +1,41 @@
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { AuditLog } from './audit-log.entity';
+import { Transform } from 'stream';
+
+@Injectable()
+export class AuditExportService {
+  constructor(
+    @InjectRepository(AuditLog)
+    private readonly repo: Repository<AuditLog>,
+  ) {}
+
+  async streamExport(res: any, startDate: Date, endDate: Date): Promise<void> {
+    const diff = endDate.getTime() - startDate.getTime();
+    const maxSyncMs = 90 * 24 * 60 * 60 * 1000;
+
+    if (diff > maxSyncMs) {
+      res.status(400).json({ message: 'Use async export for ranges > 90 days' });
+      return;
+    }
+
+    const query = this.repo
+      .createQueryBuilder('log')
+      .where('log.createdAt BETWEEN :start AND :end', { start: startDate, end: endDate })
+      .orderBy('log.createdAt', 'ASC')
+      .stream();
+
+    res.setHeader('Content-Type', 'text/csv');
+    res.setHeader('Content-Disposition', 'attachment; filename="audit-export.csv"');
+
+    const csvTransform = new Transform({
+      objectMode: true,
+      transform(row: Record<string, unknown>, _encoding, callback) {
+        callback(null, JSON.stringify(row) + '\n');
+      },
+    });
+
+    query.pipe(csvTransform).pipe(res);
+  }
+}