diff --git a/package.json b/package.json
index c8b350f..0380742 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "node": ">=22"
   },
   "scripts": {
-    "build": "tsc --project tsconfig.json",
+    "build": "tsc --project tsconfig.json && node scripts/copy-assets.mjs",
     "dev": "tsx watch src/main.ts",
     "start": "node dist/main.js",
     "test": "vitest run",
diff --git a/scripts/copy-assets.mjs b/scripts/copy-assets.mjs
new file mode 100644
index 0000000..76686ed
--- /dev/null
+++ b/scripts/copy-assets.mjs
@@ -0,0 +1,16 @@
+// Copies non-TypeScript build artifacts into dist/ after tsc.
+// Currently: SQL migration files for the runtime migration runner.
+// tsc only emits .ts → .js; everything else has to be copied explicitly.
+
+import { cpSync, existsSync } from 'node:fs';
+
+const assets = [{ src: 'src/db/migrations', dest: 'dist/db/migrations' }];
+
+for (const { src, dest } of assets) {
+  if (!existsSync(src)) {
+    console.error(`copy-assets: source missing: ${src}`);
+    process.exit(1);
+  }
+  cpSync(src, dest, { recursive: true });
+  console.log(`copy-assets: ${src} -> ${dest}`);
+}