feat: SQLite backup & restore with WASM preview (#5887)

apps/nextjs/src/app/api/backup/sql-wasm/route.ts

@@ -0,0 +1,30 @@
+import fs from "fs";
+import path from "path";
+
+import { NextResponse } from "next/server";
+
+const wasmCandidates = [
+  path.join(process.cwd(), "public/sql-wasm.wasm"),
+  path.join(process.cwd(), "apps/nextjs/public/sql-wasm.wasm"),
+  path.resolve(process.cwd(), "../../node_modules/sql.js/dist/sql-wasm.wasm"),
+  path.join(process.cwd(), "node_modules/sql.js/dist/sql-wasm.wasm"),
+];
+
+let cachedWasm: Buffer | null = null;
+
+export async function GET() {
+  if (!cachedWasm) {
+    const found = wasmCandidates.find((p) => fs.existsSync(p));
+    if (!found) {
+      return NextResponse.json({ error: "WASM binary not found" }, { status: 500 });
+    }
+    cachedWasm = fs.readFileSync(found);
+  }
+
+  return new NextResponse(cachedWasm, {
+    headers: {
+      "Content-Type": "application/wasm",
+      "Cache-Control": "public, max-age=31536000, immutable",
+    },
+  });
+}