Merge pull request 'Fix db:export ENOBUFS by streaming pg_dump output to file' (#17) from dev into main

Reviewed-on: #17

backend/src/db/export.ts

@@ -1,5 +1,5 @@
 import 'dotenv/config';
-import { existsSync, mkdirSync, writeFileSync } from 'fs';
+import { closeSync, existsSync, mkdirSync, openSync } from 'fs';
 import { dirname, resolve } from 'path';
 import { spawnSync } from 'child_process';
 import Database from 'better-sqlite3';
@@ -43,28 +43,32 @@ function exportSqlite(outputPath: string): void {
 
 function exportPostgres(outputPath: string): void {
   const connString = process.env.DATABASE_URL || 'postgresql://localhost:5432/spanglish';
-  const result = spawnSync(
-    'pg_dump',
-    ['--clean', '--if-exists', connString],
-    {
-      stdio: ['ignore', 'pipe', 'pipe'],
-      encoding: 'utf-8',
+  const outFd = openSync(outputPath, 'w');
+  try {
+    const result = spawnSync(
+      'pg_dump',
+      ['--clean', '--if-exists', connString],
+      {
+        stdio: ['ignore', outFd, 'pipe'],
+        encoding: 'utf-8',
+      }
+    );
+
+    if (result.error) {
+      console.error('pg_dump failed. Ensure pg_dump is installed and in PATH.');
+      console.error(result.error.message);
+      process.exit(1);
     }
-  );
 
-  if (result.error) {
-    console.error('pg_dump failed. Ensure pg_dump is installed and in PATH.');
-    console.error(result.error.message);
-    process.exit(1);
+    if (result.status !== 0) {
+      console.error('pg_dump failed:', result.stderr);
+      process.exit(1);
+    }
+
+    console.log(`Exported to ${outputPath}`);
+  } finally {
+    closeSync(outFd);
   }
-
-  if (result.status !== 0) {
-    console.error('pg_dump failed:', result.stderr);
-    process.exit(1);
-  }
-
-  writeFileSync(outputPath, result.stdout);
-  console.log(`Exported to ${outputPath}`);
 }
 
 async function main() {