feat: auto-cleanup logs older than 7 days

Request logs and reaction logs are automatically pruned on each request
via waitUntil. Zero-cost async cleanup, no cron needed.

小橘 🍊（NEKO Team）

packages/engine/src/index.ts

@@ -79,26 +79,33 @@ app.use('*', async (c, next) => {
   if (path === '/health' || path.startsWith('/ui')) return
 
   try {
+    const SEVEN_DAYS_MS = 7 * 24 * 60 * 60 * 1000
+    const cutoff = Date.now() - SEVEN_DAYS_MS
     c.executionCtx.waitUntil(
-      c.env.DB.prepare(
+      Promise.all([
-        'INSERT INTO request_logs (method, path, api_key_id, api_key_name, status_code, error, duration_ms, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?)',
+        c.env.DB.prepare(
-      )
+          'INSERT INTO request_logs (method, path, api_key_id, api_key_name, status_code, error, duration_ms, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?)',
-        .bind(
-          c.req.method,
-          path,
-          c.get('apiKeyId') || null,
-          c.get('apiKeyName') || null,
-          c.res.status,
-          c.res.status >= 400
-            ? await c.res
-                .clone()
-                .text()
-                .catch(() => null)
-            : null,
-          duration,
-          Date.now(),
         )
-        .run(),
+          .bind(
+            c.req.method,
+            path,
+            c.get('apiKeyId') || null,
+            c.get('apiKeyName') || null,
+            c.res.status,
+            c.res.status >= 400
+              ? await c.res
+                  .clone()
+                  .text()
+                  .catch(() => null)
+              : null,
+            duration,
+            Date.now(),
+          )
+          .run(),
+        // Cleanup logs older than 7 days
+        c.env.DB.prepare('DELETE FROM request_logs WHERE created_at < ?').bind(cutoff).run(),
+        c.env.DB.prepare('DELETE FROM reaction_logs WHERE created_at < ?').bind(cutoff).run(),
+      ]),
     )
   } catch {
     // executionCtx not available in test, skip