Improve application responsiveness and background processing

vite.reports.config.ts

@@ -0,0 +1,17 @@
+import { defineConfig } from 'vite';
+import { resolve } from 'node:path';
+
+// Build the same report implementations for Node workers. Their database is
+// read-only; migrations and all application writes stay in the controller.
+export default defineConfig({
+    plugins: [{ name: 'report-database', enforce: 'pre', resolveId(source) {
+        if (source.endsWith('/db/index.js')) return resolve('src/lib/server/reports/database.ts');
+    } }],
+    build: {
+        ssr: true, outDir: '.svelte-kit/reports', emptyOutDir: true,
+        rollupOptions: {
+            input: 'src/lib/server/reports/worker.ts', external: ['better-sqlite3'],
+            output: { entryFileNames: 'worker.mjs' }
+        }
+    }
+});