feat(backend): implement v2 domain slice and live smoke

backend/command-api/scripts/migrate-v2-schema.mjs

@@ -0,0 +1,69 @@
+import { readdirSync, readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { Pool } from 'pg';
+
+const databaseUrl = process.env.DATABASE_URL;
+
+if (!databaseUrl) {
+  // eslint-disable-next-line no-console
+  console.error('DATABASE_URL is required');
+  process.exit(1);
+}
+
+const scriptDir = resolve(fileURLToPath(new URL('.', import.meta.url)));
+const migrationsDir = resolve(scriptDir, '../sql/v2');
+
+const migrationFiles = readdirSync(migrationsDir)
+  .filter((file) => file.endsWith('.sql'))
+  .sort();
+
+const pool = new Pool({
+  connectionString: databaseUrl,
+  max: Number.parseInt(process.env.DB_POOL_MAX || '5', 10),
+});
+
+async function ensureMigrationTable(client) {
+  await client.query(`
+    CREATE TABLE IF NOT EXISTS schema_migrations (
+      version TEXT PRIMARY KEY,
+      applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+    );
+  `);
+}
+
+try {
+  const client = await pool.connect();
+  try {
+    await client.query('BEGIN');
+    await ensureMigrationTable(client);
+
+    for (const file of migrationFiles) {
+      const alreadyApplied = await client.query(
+        'SELECT 1 FROM schema_migrations WHERE version = $1',
+        [file]
+      );
+      if (alreadyApplied.rowCount > 0) {
+        continue;
+      }
+
+      const sql = readFileSync(resolve(migrationsDir, file), 'utf8');
+      await client.query(sql);
+      await client.query(
+        'INSERT INTO schema_migrations (version) VALUES ($1)',
+        [file]
+      );
+      // eslint-disable-next-line no-console
+      console.log(`Applied migration ${file}`);
+    }
+
+    await client.query('COMMIT');
+  } catch (error) {
+    await client.query('ROLLBACK');
+    throw error;
+  } finally {
+    client.release();
+  }
+} finally {
+  await pool.end();
+}