Add transcription comparison stats

internal/model/job.go

@@ -119,6 +119,22 @@ type ErrorStat struct {
 	Last24h      int64  `json:"last_24h"`
 }
 
+type TranscriptionComparisonStat struct {
+	Provider        string     `json:"provider"`
+	Model           string     `json:"model,omitempty"`
+	Attempts        int64      `json:"attempts"`
+	Success         int64      `json:"success"`
+	Failed          int64      `json:"failed"`
+	SuccessRate     float64    `json:"success_rate"`
+	Wins            int64      `json:"wins"`
+	Last24hAttempts int64      `json:"last_24h_attempts"`
+	Last24hSuccess  int64      `json:"last_24h_success"`
+	AvgDurationMS   int64      `json:"avg_duration_ms"`
+	P50DurationMS   int64      `json:"p50_duration_ms"`
+	AvgTextChars    int64      `json:"avg_text_chars"`
+	LastAt          *time.Time `json:"last_at,omitempty"`
+}
+
 type OwnerStat struct {
 	OwnerService string `json:"owner_service"`
 	TaskType     string `json:"task_type"`