Added postgres DB, models. Updated services for ansync DB operations, etc

scripts/migrate.ts

@@ -0,0 +1,48 @@
+import 'dotenv/config';
+import fs from 'fs';
+import path from 'path';
+import { pool } from '../src/db/pool';
+
+async function migrate() {
+  const client = await pool.connect();
+  try {
+    await client.query(`
+      CREATE TABLE IF NOT EXISTS schema_migrations (
+        id SERIAL PRIMARY KEY,
+        name TEXT NOT NULL UNIQUE,
+        applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+      )
+    `);
+
+    const migrationsDir = path.join(__dirname, '../migrations');
+    const files = fs.readdirSync(migrationsDir).filter(f => f.endsWith('.sql')).sort();
+
+    for (const file of files) {
+      const { rows } = await client.query(
+        'SELECT 1 FROM schema_migrations WHERE name = $1',
+        [file],
+      );
+      if (rows.length > 0) continue;
+
+      const sql = fs.readFileSync(path.join(migrationsDir, file), 'utf8');
+      await client.query('BEGIN');
+      try {
+        await client.query(sql);
+        await client.query('INSERT INTO schema_migrations (name) VALUES ($1)', [file]);
+        await client.query('COMMIT');
+        console.log(`Applied: ${file}`);
+      } catch (err) {
+        await client.query('ROLLBACK');
+        throw err;
+      }
+    }
+  } finally {
+    client.release();
+    await pool.end();
+  }
+}
+
+migrate().catch(err => {
+  console.error(err);
+  process.exit(1);
+});