improve event processing by adding asynchronous handling for better performance

src/routes/events.js

@@ -1,36 +1,67 @@
 const db = require('../db');
 
+function parseLimit(value) {
+  const n = Number.parseInt(value, 10);
+  return Number.isFinite(n) && n > 0 ? Math.min(n, 100) : 20;
+}
+
+function parseOffset(value) {
+  const n = Number.parseInt(value, 10);
+  return Number.isFinite(n) && n >= 0 ? n : 0;
+}
+
 async function eventRoutes(fastify) {
   fastify.get('/events', async (request, reply) => {
     const query = request.query || {};
 
-    if (!query.id) {
-      reply.code(400);
-      return { error: 'id is required' };
+    if (query.id) {
+      const id = Number.parseInt(query.id, 10);
+      if (!Number.isFinite(id)) {
+        reply.code(400);
+        return { error: 'id must be a number' };
+      }
+
+      const event = db.prepare(`SELECT id, title, created_at FROM events WHERE id = ?`).get(id);
+      if (!event) {
+        reply.code(404);
+        return { error: 'Event not found' };
+      }
+
+      const articles = db.prepare(`
+        SELECT id, title, description, content, url, normalized_title, source, pub_date, ingested_at
+        FROM articles
+        WHERE event_id = ?
+          AND content IS NOT NULL AND content != ''
+          AND is_index_page = 0
+        ORDER BY pub_date_effective DESC, id DESC
+      `).all(id);
+
+      return { ...event, articles };
     }
 
-    const id = Number.parseInt(query.id, 10);
-    if (!Number.isFinite(id)) {
-      reply.code(400);
-      return { error: 'id must be a number' };
-    }
+    const limit = parseLimit(query.limit);
+    const offset = parseOffset(query.offset);
 
-    const event = db.prepare(`SELECT id, title, created_at FROM events WHERE id = ?`).get(id);
-    if (!event) {
-      reply.code(404);
-      return { error: 'Event not found' };
-    }
+    const SORT_COLUMNS = {
+      created_at: 'e.created_at',
+      id: 'e.id',
+      article_count: 'article_count',
+    };
 
-    const articles = db.prepare(`
-      SELECT id, title, description, content, url, normalized_title, source, pub_date, ingested_at
-      FROM articles
-      WHERE event_id = ?
-        AND content IS NOT NULL AND content != ''
-        AND is_index_page = 0
-      ORDER BY pub_date_effective DESC, id DESC
-    `).all(id);
+    const sortBy = SORT_COLUMNS[query.sort_by] || SORT_COLUMNS.created_at;
+    const order = String(query.order || '').toLowerCase() === 'asc' ? 'ASC' : 'DESC';
 
-    return { ...event, articles };
+    return db.prepare(`
+      SELECT e.id, e.title, e.created_at,
+        COUNT(a.id) AS article_count
+      FROM events e
+      LEFT JOIN articles a ON a.event_id = e.id
+        AND a.content IS NOT NULL AND a.content != ''
+        AND a.is_index_page = 0
+      GROUP BY e.id
+      ORDER BY ${sortBy} ${order}, e.id ${order}
+      LIMIT ? OFFSET ?
+    `).all(limit, offset);
   });
 }