feat: add automatic workspace file cleanup cron

apps/api/src/lib/cleanup.ts

@@ -0,0 +1,46 @@
+import { readdir, stat, rm } from "node:fs/promises";
+import { join } from "node:path";
+import { mkdirSync } from "node:fs";
+import { env } from "../config.js";
+
+export function startCleanupCron() {
+  // Ensure workspace directory exists
+  mkdirSync(env.WORKSPACE_PATH, { recursive: true });
+
+  const intervalMs = env.CLEANUP_INTERVAL_MINUTES * 60 * 1000;
+  const maxAgeMs = env.FILE_MAX_AGE_HOURS * 60 * 60 * 1000;
+
+  const cleanup = async () => {
+    try {
+      const entries = await readdir(env.WORKSPACE_PATH, { withFileTypes: true }).catch(() => []);
+      const now = Date.now();
+      let cleaned = 0;
+
+      for (const entry of entries) {
+        const fullPath = join(env.WORKSPACE_PATH, entry.name);
+        try {
+          const stats = await stat(fullPath);
+          if (now - stats.mtimeMs > maxAgeMs) {
+            await rm(fullPath, { recursive: true });
+            cleaned++;
+          }
+        } catch {
+          // Skip files that can't be stat'd
+        }
+      }
+
+      if (cleaned > 0) {
+        console.log(`Cleanup: removed ${cleaned} expired workspace entries`);
+      }
+    } catch (err) {
+      console.error("Cleanup error:", err);
+    }
+  };
+
+  // Run on startup
+  cleanup();
+
+  // Schedule recurring cleanup
+  setInterval(cleanup, intervalMs);
+  console.log(`Cleanup scheduled: every ${env.CLEANUP_INTERVAL_MINUTES}m, max age ${env.FILE_MAX_AGE_HOURS}h`);
+}