feat: use active users instead of total users in Template views (#3900)

coderd/database/databasefake/databasefake.go

@@ -163,7 +163,7 @@ func (q *fakeQuerier) GetTemplateDAUs(_ context.Context, templateID uuid.UUID) (
 	q.mutex.Lock()
 	defer q.mutex.Unlock()
 
-	counts := make(map[time.Time]map[string]struct{})
+	seens := make(map[time.Time]map[uuid.UUID]struct{})
 
 	for _, as := range q.agentStats {
 		if as.TemplateID != templateID {
@@ -171,26 +171,29 @@ func (q *fakeQuerier) GetTemplateDAUs(_ context.Context, templateID uuid.UUID) (
 		}
 
 		date := as.CreatedAt.Truncate(time.Hour * 24)
-		dateEntry := counts[date]
-		if dateEntry == nil {
-			dateEntry = make(map[string]struct{})
-		}
-		counts[date] = dateEntry
 
-		dateEntry[as.UserID.String()] = struct{}{}
+		dateEntry := seens[date]
+		if dateEntry == nil {
+			dateEntry = make(map[uuid.UUID]struct{})
+		}
+		dateEntry[as.UserID] = struct{}{}
+		seens[date] = dateEntry
 	}
 
-	countKeys := maps.Keys(counts)
-	sort.Slice(countKeys, func(i, j int) bool {
-		return countKeys[i].Before(countKeys[j])
+	seenKeys := maps.Keys(seens)
+	sort.Slice(seenKeys, func(i, j int) bool {
+		return seenKeys[i].Before(seenKeys[j])
 	})
 
 	var rs []database.GetTemplateDAUsRow
-	for _, key := range countKeys {
-		rs = append(rs, database.GetTemplateDAUsRow{
-			Date:   key,
-			Amount: int64(len(counts[key])),
-		})
+	for _, key := range seenKeys {
+		ids := seens[key]
+		for id := range ids {
+			rs = append(rs, database.GetTemplateDAUsRow{
+				Date:   key,
+				UserID: id,
+			})
+		}
 	}
 
 	return rs, nil