Add AI DEV Node deployment foundation

server/db/migrate.ts

@@ -0,0 +1,56 @@
+import { readdir, readFile } from 'node:fs/promises';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { closePool, query } from './pool.js';
+
+const migrationsDir = path.resolve(process.cwd(), 'migrations');
+
+async function ensureMigrationTable(): Promise<void> {
+  await query(`
+    CREATE TABLE IF NOT EXISTS schema_migrations (
+      filename VARCHAR(255) PRIMARY KEY,
+      applied_at TIMESTAMP NOT NULL DEFAULT now()
+    )
+  `);
+}
+
+async function appliedMigrations(): Promise<Set<string>> {
+  const result = await query<{ filename: string }>('SELECT filename FROM schema_migrations');
+  return new Set(result.rows.map((row) => row.filename));
+}
+
+export async function runMigrations(): Promise<void> {
+  await ensureMigrationTable();
+  const applied = await appliedMigrations();
+  const files = (await readdir(migrationsDir))
+    .filter((file) => file.endsWith('.sql'))
+    .sort();
+
+  for (const file of files) {
+    if (applied.has(file)) continue;
+
+    const sql = await readFile(path.join(migrationsDir, file), 'utf8');
+    await query('BEGIN');
+    try {
+      await query(sql);
+      await query('INSERT INTO schema_migrations (filename) VALUES ($1)', [file]);
+      await query('COMMIT');
+      console.log(`Applied migration ${file}`);
+    } catch (error) {
+      await query('ROLLBACK');
+      throw error;
+    }
+  }
+}
+
+if (process.argv[1] && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url)) {
+  runMigrations()
+    .then(async () => {
+      await closePool();
+    })
+    .catch(async (error: unknown) => {
+      console.error(error);
+      await closePool();
+      process.exitCode = 1;
+    });
+}