feat(admin): observability — job history, live now-analyzing, durations & metrics (0.84.0) (#6)

backend/src/settings.rs

@@ -192,6 +192,11 @@ impl CrawlerSettings {
             idle_timeout: Duration::from_secs(self.idle_timeout_secs),
             chapter_workers: (self.chapter_workers as usize).max(1),
             retention_days: self.retention_days,
+            // Not a runtime-editable setting; re-read the env default so a
+            // settings reload keeps whatever CRAWL_METRICS_RETENTION_DAYS was
+            // configured at boot.
+            metrics_retention_days: crate::config::env_u64("CRAWL_METRICS_RETENTION_DAYS", 90)
+                as u32,
             start_url,
             rate_ms: self.rate_ms,
             cdn_host,