fix: getWatcherHistoricalPrices method response |2

Author: serezhaolshan

src/watcher/watcher.network.ts

@@ -24,7 +24,7 @@ export class WatcherNetwork {
   async getWatcherHistoricalPrices(req: Request, res: Response): Promise<void> {
     try {
       const prices = await this.service.getWatcherHistoryPrices();
-      res.json({ prices: [prices] });
+      res.json({ prices: JSON.parse([prices]) });
     } catch (error) {
       this.handleErrorResponse(res, error);
     }