Enhance dashboard service with widget caching and improved query handling

- Introduced a new `widgetCache` structure to manage caching for various dashboard widgets, improving performance and reducing redundant data retrieval.
- Updated the `ClosingSoon` and `Trend` methods in the service to utilize the new caching mechanism, ensuring efficient data access and reducing load on the database.
- Enhanced the `NoticeTypes` and `Countries` methods to implement caching, further optimizing the dashboard's responsiveness.
- Added a new `searchListCache` implementation in the tender service to cache search results, improving the efficiency of tender searches and reducing database load.
- Implemented robust error handling and logging for cache operations, ensuring better visibility into potential issues.

This update significantly enhances the performance and scalability of the dashboard and tender services by integrating effective caching strategies, leading to improved user experience and resource management.

internal/tender/service.go

@@ -10,6 +10,7 @@ import (
 	"path"
 	"path/filepath"
 	"strings"
+	"sync"
 	"time"
 	"tm/internal/company"
 	"tm/internal/customer"
@@ -20,6 +21,7 @@ import (
 	"tm/pkg/response"
 
 	"golang.org/x/sync/errgroup"
+	"golang.org/x/sync/singleflight"
 )
 
 // AISummarizerClient defines the interface for on-demand AI operations.
@@ -95,6 +97,9 @@ type tenderService struct {
 	redisClient          redis.Client
 	pageCacheTTL         time.Duration
 	defaultLanguage      string
+	searchListCacheMu    sync.Mutex
+	searchListCache      map[string]searchListCacheEntry
+	searchListCacheGroup singleflight.Group
 }
 
 const (
@@ -136,6 +141,7 @@ func NewService(
 		redisClient:          redisClient,
 		pageCacheTTL:         recommendationPageCacheTTL,
 		defaultLanguage:      strings.ToLower(defaultLanguage),
+		searchListCache:      make(map[string]searchListCacheEntry),
 	}
 }
 
@@ -922,8 +928,13 @@ func (s *tenderService) Search(ctx context.Context, form *SearchForm, pagination
 		"to":          form.DeadlineTo,
 	})
 
-	// Profile keywords are not used for tender search.
+	language := s.pickResponseLanguage(form.Language)
+	return s.cachedSearchList(ctx, form, pagination, language, func(loadCtx context.Context) (*SearchResponse, error) {
+		return s.searchUncached(loadCtx, form, pagination, language)
+	})
+}
 
+func (s *tenderService) searchUncached(ctx context.Context, form *SearchForm, pagination *response.Pagination, language string) (*SearchResponse, error) {
 	page, err := s.repository.Search(ctx, form, pagination)
 	if err != nil {
 		s.logger.Error("Failed to list tenders", map[string]interface{}{
@@ -936,7 +947,7 @@ func (s *tenderService) Search(ctx context.Context, form *SearchForm, pagination
 	if form.CompanyID == nil || *form.CompanyID == "" {
 		tenderResponses := make([]TenderResponse, 0, len(page.Items))
 		for _, tender := range page.Items {
-			tenderResponses = append(tenderResponses, *tender.ToResponseWithLanguage(s.pickResponseLanguage(form.Language)))
+			tenderResponses = append(tenderResponses, *tender.ToResponseWithLanguage(language))
 		}
 
 		return &SearchResponse{
@@ -955,7 +966,7 @@ func (s *tenderService) Search(ctx context.Context, form *SearchForm, pagination
 		// Continue without match percentage if company not found
 		tenderResponses := make([]TenderResponse, 0, len(page.Items))
 		for _, tender := range page.Items {
-			tenderResponses = append(tenderResponses, *tender.ToResponseWithLanguage(s.pickResponseLanguage(form.Language)))
+			tenderResponses = append(tenderResponses, *tender.ToResponseWithLanguage(language))
 		}
 
 		return &SearchResponse{
@@ -978,7 +989,7 @@ func (s *tenderService) Search(ctx context.Context, form *SearchForm, pagination
 
 	tenderResponses := make([]TenderResponse, 0, len(page.Items))
 	for _, tender := range page.Items {
-		tenderResponses = append(tenderResponses, *tender.ToResponseWithLanguage(s.pickResponseLanguage(form.Language)))
+		tenderResponses = append(tenderResponses, *tender.ToResponseWithLanguage(language))
 	}
 
 	return &SearchResponse{