diff --git a/internal/api/log_handler.go b/internal/api/log_handler.go
index 592f4c6..6aec9d9 100644
--- a/internal/api/log_handler.go
+++ b/internal/api/log_handler.go
@@ -568,8 +568,8 @@ func (h *Handler) logStatsByMinute(c *gin.Context, q *gorm.DB, sinceTime, untilT
 	duration := untilTime.Sub(*sinceTime)
 	if duration > maxMinuteRangeDuration {
 		c.JSON(http.StatusBadRequest, gin.H{
-			"error":       "time range too large for minute-level aggregation",
-			"max_hours":   6,
+			"error":        "time range too large for minute-level aggregation",
+			"max_hours":    6,
 			"actual_hours": duration.Hours(),
 		})
 		return
@@ -618,9 +618,10 @@ type TrafficMetrics struct {
 
 // TrafficBucket represents one time bucket with model breakdown
 type TrafficBucket struct {
-	Time      string                    `json:"time"`
-	Timestamp int64                     `json:"timestamp"`
-	Breakdown map[string]TrafficMetrics `json:"breakdown"`
+	Time      string `json:"time"`
+	Timestamp int64  `json:"timestamp"`
+	// Breakdown contains per-model metrics, keyed by model name (e.g. "gpt-4", "claude-3-opus", "other")
+	Breakdown map[string]TrafficMetrics `json:"breakdown" swaggertype:"object,object" example:"{\"gpt-4\":{\"count\":10,\"tokens_in\":1000,\"tokens_out\":500},\"claude-3-opus\":{\"count\":5,\"tokens_in\":800,\"tokens_out\":400},\"other\":{\"count\":3,\"tokens_in\":200,\"tokens_out\":100}}"`
 	Total     TrafficMetrics            `json:"total"`
 }
 
@@ -734,7 +735,7 @@ func (h *Handler) GetTrafficChart(c *gin.Context) {
 	}
 	var rows []bucketModelStats
 
-	if err := q.Select(truncFunc+" as bucket, model_name, COUNT(*) as cnt, COALESCE(SUM(tokens_in),0) as tokens_in, COALESCE(SUM(tokens_out),0) as tokens_out").
+	if err := q.Select(truncFunc + " as bucket, model_name, COUNT(*) as cnt, COALESCE(SUM(tokens_in),0) as tokens_in, COALESCE(SUM(tokens_out),0) as tokens_out").
 		Group("bucket, model_name").
 		Order("bucket ASC, cnt DESC").
 		Scan(&rows).Error; err != nil {