diff --git a/models/summary.go b/models/summary.go
index 5b97e5a..38f1175 100644
--- a/models/summary.go
+++ b/models/summary.go
@@ -26,6 +26,7 @@ type Summary struct {
 type SummaryItem struct {
 	ID        uint          `json:"-" gorm:"primary_key"`
 	SummaryID uint          `json:"-"`
+	Type      uint8         `json:"-"`
 	Key       string        `json:"key"`
 	Total     time.Duration `json:"total"`
 }
diff --git a/routes/summary.go b/routes/summary.go
index e9c4e81..2f49baf 100644
--- a/routes/summary.go
+++ b/routes/summary.go
@@ -76,7 +76,7 @@ func (h *SummaryHandler) Get(w http.ResponseWriter, r *http.Request) {
 	cacheKey := getHash([]time.Time{from, to}, user)
 	if cachedSummary, ok := h.Cache.Get(cacheKey); !ok {
 		// Cache Miss
-		summary, err = h.SummarySrvc.GetSummary(from, to, user) // 'to' is always constant
+		summary, err = h.SummarySrvc.CreateSummary(from, to, user) // 'to' is always constant
 		if err != nil {
 			w.WriteHeader(http.StatusInternalServerError)
 			return
diff --git a/services/aggregation.go b/services/aggregation.go
index 2cc2141..4e1f44e 100644
--- a/services/aggregation.go
+++ b/services/aggregation.go
@@ -58,7 +58,7 @@ func (srv *AggregationService) Start(interval time.Duration) {
 
 func (srv *AggregationService) summaryWorker(jobs <-chan *AggregationJob, summaries chan<- *models.Summary) {
 	for job := range jobs {
-		if summary, err := srv.SummaryService.GetSummary(job.From, job.To, &models.User{ID: job.UserID}); err != nil {
+		if summary, err := srv.SummaryService.CreateSummary(job.From, job.To, &models.User{ID: job.UserID}); err != nil {
 			log.Printf("Failed to generate summary (%v, %v, %s) – %v.", job.From, job.To, job.UserID, err)
 		} else {
 			summaries <- summary
diff --git a/services/summary.go b/services/summary.go
index 34dcf2a..ffb637b 100644
--- a/services/summary.go
+++ b/services/summary.go
@@ -23,7 +23,8 @@ type Interval struct {
 	End   time.Time
 }
 
-func (srv *SummaryService) GetSummary(from, to time.Time, user *models.User) (*models.Summary, error) {
+// TODO: Rename methods to clarify difference between generating a new summary from old summaries and heartbeats, like this method, and only retrieving a persisted summary from database, like GetByUserWithin
+func (srv *SummaryService) CreateSummary(from, to time.Time, user *models.User) (*models.Summary, error) {
 	existingSummaries, err := srv.GetByUserWithin(user, from, to)
 	if err != nil {
 		return nil, err
@@ -135,25 +136,25 @@ func mergeSummaries(summaries []*models.Summary) (*models.Summary, error) {
 }
 
 func mergeSummaryItems(existing *[]models.SummaryItem, new *[]models.SummaryItem) []models.SummaryItem {
-	items := make(map[string]time.Duration)
+	items := make(map[string]*models.SummaryItem)
 
 	// Build map from existing
 	for _, item := range *existing {
-		items[item.Key] = item.Total
+		items[item.Key] = &item
 	}
 
 	for _, item := range *new {
-		if _, ok := items[item.Key]; !ok {
-			items[item.Key] = item.Total
+		if it, ok := items[item.Key]; !ok {
+			items[item.Key] = &item
 		} else {
-			items[item.Key] += item.Total
+			(*it).Total += item.Total
 		}
 	}
 
 	var i int
 	itemList := make([]models.SummaryItem, len(items))
 	for k, v := range items {
-		itemList[i] = models.SummaryItem{Key: k, Total: v}
+		itemList[i] = models.SummaryItem{Key: k, Total: v.Total, Type: v.Type}
 		i++
 	}
 
@@ -178,6 +179,10 @@ func (srv *SummaryService) GetByUserWithin(user *models.User, from, to time.Time
 		Where(&models.Summary{UserID: user.ID}).
 		Where("from_time >= ?", from).
 		Where("to_time <= ?", to).
+		Preload("Projects", "type = ?", models.SummaryProject).
+		Preload("Languages", "type = ?", models.SummaryLanguage).
+		Preload("Editors", "type = ?", models.SummaryEditor).
+		Preload("OperatingSystems", "type = ?", models.SummaryOS).
 		Find(&summaries).Error; err != nil {
 		return nil, err
 	}
@@ -238,6 +243,7 @@ func (srv *SummaryService) aggregateBy(heartbeats []*models.Heartbeat, summaryTy
 		items = append(items, models.SummaryItem{
 			Key:   k,
 			Total: v / time.Second,
+			Type:  summaryType,
 		})
 	}