feat(timezone): implement UTC and Beijing time conversion utilities and update bid handling

- Add functions to convert between UTC and Beijing time in timezone utility.
- Update BidsService to return latest update and publish dates in Beijing time.
- Modify BidCrawlerService to store publish dates in UTC format.
- Change database timezone configuration to UTC for consistency.

src/bids/services/bid.service.ts

@@ -7,6 +7,7 @@ import {
   getDaysAgo,
   setStartOfDay,
   setEndOfDay,
+  utcToBeijing,
 } from '../../common/utils/timezone.util';
 
 interface FindAllQuery {
@@ -23,7 +24,7 @@ interface SourceResult {
 export interface CrawlInfoAddStats {
   source: string;
   count: number;
-  latestUpdate: Date | string;
+  latestUpdate: Date | string | null;
   latestPublishDate: Date | string | null;
   error: string | null;
 }
@@ -164,7 +165,7 @@ export class BidsService {
         count,
         latestPublishDate,
         error,
-        strftime('%Y-%m-%d %H:%M:%S', createdAt, '+8 hours') as latestUpdate
+        createdAt as latestUpdate
       FROM crawl_info_add
       WHERE (source, createdAt) IN (
         SELECT source, MAX(createdAt)
@@ -177,16 +178,26 @@ export class BidsService {
     const results =
       await this.crawlInfoRepository.query<CrawlInfoAddRawResult[]>(query);
 
-    return results.map((item) => ({
-      source: String(item.source),
-      count: Number(item.count),
-      latestUpdate: item.latestUpdate,
-      latestPublishDate: item.latestPublishDate,
-      // 确保 error 字段正确处理：null 或空字符串都转换为 null，非空字符串保留
-      error:
-        item.error && String(item.error).trim() !== ''
-          ? String(item.error)
-          : null,
-    }));
+    return results.map((item) => {
+      // 将UTC时间转换为北京时间显示
+      const latestUpdateBeijing = item.latestUpdate
+        ? utcToBeijing(new Date(item.latestUpdate))
+        : null;
+      const latestPublishDateBeijing = item.latestPublishDate
+        ? utcToBeijing(new Date(item.latestPublishDate))
+        : null;
+
+      return {
+        source: String(item.source),
+        count: Number(item.count),
+        latestUpdate: latestUpdateBeijing,
+        latestPublishDate: latestPublishDateBeijing,
+        // 确保 error 字段正确处理：null 或空字符串都转换为 null，非空字符串保留
+        error:
+          item.error && String(item.error).trim() !== ''
+            ? String(item.error)
+            : null,
+      };
+    });
   }
 }