add worker event tracking; implement worker rates display in admin panel

src/routes/admin.js

@@ -432,7 +432,22 @@ async function adminRoutes(fastify) {
       FROM articles GROUP BY content_status ORDER BY n DESC
     `).all();
 
-    return { total, withContent, withEmbedding, eventCount, bySource, byStatus };
+    const ingestedPerHour = db.prepare(`
+      SELECT COUNT(*) as n FROM articles WHERE ingested_at >= datetime('now', '-1 hour')
+    `).get().n;
+
+    const contentPerHour = db.prepare(`
+      SELECT COUNT(*) as n FROM articles WHERE content_attempted_at >= datetime('now', '-1 hour')
+    `).get().n;
+
+    let embeddingsPerHour = 0;
+    try {
+      embeddingsPerHour = db.prepare(`
+        SELECT COUNT(*) as n FROM article_embedding_meta WHERE embedded_at >= datetime('now', '-1 hour')
+      `).get().n;
+    } catch (_) {}
+
+    return { total, withContent, withEmbedding, eventCount, bySource, byStatus, ingestedPerHour, contentPerHour, embeddingsPerHour };
   });
 }