feat: 添加爬虫统计信息页面和功能

新增爬虫统计信息页面，展示各来源的爬取数量、最新更新时间、错误信息等统计指标
后端添加爬虫统计信息存储和查询接口，记录每次爬取的结果
支持按关键词过滤招标信息查询

src/crawler/services/bid-crawler.service.ts

@@ -1,7 +1,10 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
 import * as puppeteer from 'puppeteer';
 import { BidsService } from '../../bids/services/bid.service';
+import { CrawlInfoAdd } from '../entities/crawl-info-add.entity';
 import { ChdtpCrawler } from './chdtp_target';
 import { ChngCrawler } from './chng_target';
 import { SzecpCrawler } from './szecp_target';
@@ -22,6 +25,8 @@ export class BidCrawlerService {
   constructor(
     private bidsService: BidsService,
     private configService: ConfigService,
+    @InjectRepository(CrawlInfoAdd)
+    private crawlInfoRepository: Repository<CrawlInfoAdd>,
   ) {}
 
   async crawlAll() {
@@ -93,6 +98,14 @@ export class BidCrawlerService {
             zeroDataCrawlers.push(crawler);
           }
 
+          // 获取最新的发布日期
+          const latestPublishDate = results.length > 0
+            ? results.reduce((latest, item) => {
+                const itemDate = new Date(item.publishDate);
+                return itemDate > latest ? itemDate : latest;
+              }, new Date(0))
+            : null;
+
           for (const item of results) {
             await this.bidsService.createOrUpdate({
               title: item.title,
@@ -102,10 +115,16 @@ export class BidCrawlerService {
               unit: '',
             });
           }
+
+          // 保存爬虫统计信息到数据库
+          await this.saveCrawlInfo(crawler.name, results.length, latestPublishDate);
         } catch (err) {
           this.logger.error(`Error crawling ${crawler.name}: ${err.message}`);
           // 记录错误信息
           crawlResults[crawler.name] = { success: 0, error: err.message };
+
+          // 保存错误信息到数据库
+          await this.saveCrawlInfo(crawler.name, 0, null, err.message);
         }
       }
       
@@ -131,6 +150,14 @@ export class BidCrawlerService {
             // 更新统计结果
             crawlResults[crawler.name] = { success: results.length };
 
+            // 获取最新的发布日期
+            const latestPublishDate = results.length > 0
+              ? results.reduce((latest, item) => {
+                  const itemDate = new Date(item.publishDate);
+                  return itemDate > latest ? itemDate : latest;
+                }, new Date(0))
+              : null;
+
             for (const item of results) {
               await this.bidsService.createOrUpdate({
                 title: item.title,
@@ -140,10 +167,16 @@ export class BidCrawlerService {
                 unit: '',
               });
             }
+
+            // 更新爬虫统计信息到数据库
+            await this.saveCrawlInfo(crawler.name, results.length, latestPublishDate);
           } catch (err) {
             this.logger.error(`Error retrying ${crawler.name}: ${err.message}`);
             // 记录错误信息
             crawlResults[crawler.name] = { success: 0, error: err.message };
+
+            // 更新错误信息到数据库
+            await this.saveCrawlInfo(crawler.name, 0, null, err.message);
           }
         }
       }
@@ -184,4 +217,24 @@ export class BidCrawlerService {
       this.logger.log('='.repeat(50));
     }
   }
+
+  private async saveCrawlInfo(
+    source: string,
+    count: number,
+    latestPublishDate: Date | null,
+    error?: string,
+  ) {
+    try {
+      const crawlInfo = this.crawlInfoRepository.create({
+        source,
+        count,
+        latestPublishDate,
+        error,
+      });
+      await this.crawlInfoRepository.save(crawlInfo);
+      this.logger.log(`Saved crawl info for ${source}: ${count} items`);
+    } catch (err) {
+      this.logger.error(`Failed to save crawl info for ${source}: ${err.message}`);
+    }
+  }
 }