feat: improve generation analytics and maintenance

frontend/src/types/generation.ts

@@ -42,15 +42,23 @@ export interface GenerationProviderStat {
 
 export interface GenerationProviderStats {
   story_id: number
+  window_days: number | null
+  capability: string | null
   total_calls: number
   successful_calls: number
   failed_calls: number
   avg_latency_ms: number | null
   estimated_cost_usd: number
   by_provider: GenerationProviderStat[]
+  failure_reasons: Array<{
+    reason: string
+    count: number
+  }>
 }
 
 export interface GenerationProviderAnalytics {
+  window_days: number | null
+  capability: string | null
   total_calls: number
   successful_calls: number
   failed_calls: number
@@ -59,4 +67,30 @@ export interface GenerationProviderAnalytics {
   job_count: number
   story_count: number
   by_provider: GenerationProviderStat[]
+  failure_reasons: Array<{
+    reason: string
+    count: number
+  }>
+}
+
+export interface GenerationRecentFailure {
+  job_id: string
+  story_id: number | null
+  story_title: string | null
+  output_mode: string
+  current_step: string
+  error_message: string | null
+  failure_label: string
+  updated_at: string
+}
+
+export interface GenerationOpsSummary {
+  window_hours: number
+  stale_threshold_minutes: number
+  active_jobs: number
+  stale_running_jobs: number
+  failed_jobs: number
+  degraded_jobs: number
+  asset_retry_jobs: number
+  recent_failures: GenerationRecentFailure[]
 }