Enhance dashboard summary and statistics with new fields and caching improvements

- Added new field `Days` and `ScrapedTED` to `SummaryResponse` for tracking daily TED scrape counts.
- Updated `SummaryQuery` to include `Days` parameter for querying scraped TED data.
- Modified `Summary` handler to accept and process the new `Days` parameter.
- Refactored `Summary` method in the repository to support the new `Days` parameter and improved aggregation logic.
- Enhanced caching logic in the service layer to utilize a composite cache key based on `closingWindowSec` and `days`, improving cache management and retrieval efficiency.

This update improves the dashboard's functionality by providing more detailed insights into TED scraping activities and optimizing the caching strategy for better performance.

internal/dashboard/statistics_repository.go

@@ -41,7 +41,6 @@ func (r *repository) Statistics(ctx context.Context, days int, startUnix int64)
 	startDay := endDay.AddDate(0, 0, -(days - 1))
 
 	var (
-		scrapedTED        map[string]int64
 		scrapedDocuments  map[string]int64
 		translatedNotices map[string]int64
 		totalDocuments    int64
@@ -62,24 +61,6 @@ func (r *repository) Statistics(ctx context.Context, days int, startUnix int64)
 		})
 	}
 
-	wg.Add(1)
-	go func() {
-		defer wg.Done()
-		qctx, cancel := context.WithTimeout(context.Background(), statisticsMongoQueryTimeout)
-		defer cancel()
-
-		// Read from the persistent metrics counter rather than the "notices" collection: the
-		// notice worker deletes processed notices shortly after promoting them into tenders, so
-		// counting from "notices" directly would undercount (often to zero) recent scrape activity.
-		counts, err := r.metricsCounter.GetTEDNoticeScrapedDailyCounts(qctx, startDay, endDay)
-		if err != nil {
-			recordFailure("scraped_ted", err)
-			scrapedTED = map[string]int64{}
-			return
-		}
-		scrapedTED = counts
-	}()
-
 	wg.Add(1)
 	go func() {
 		defer wg.Done()
@@ -172,7 +153,6 @@ func (r *repository) Statistics(ctx context.Context, days int, startUnix int64)
 		Days:        days,
 		GeneratedAt: now.Unix(),
 		Daily: StatisticsDailySeries{
-			ScrapedTED:        fillTrendSeries(days, scrapedTED),
 			ScrapedDocuments:  fillTrendSeries(days, scrapedDocuments),
 			TranslatedNotices: fillTrendSeries(days, translatedNotices),
 		},