ваше сообщение коммита

backend/services/dbSettingsService.js

@@ -0,0 +1,27 @@
+const db = require('../db');
+
+class DbSettingsService {
+  async getSettings() {
+    const { rows } = await db.getQuery()('SELECT * FROM db_settings WHERE id = 1');
+    return rows[0];
+  }
+
+  async upsertSettings({ db_host, db_port, db_name, db_user, db_password }) {
+    const { rows } = await db.getQuery()(
+      `INSERT INTO db_settings (id, db_host, db_port, db_name, db_user, db_password, updated_at)
+       VALUES (1, $1, $2, $3, $4, $5, NOW())
+       ON CONFLICT (id) DO UPDATE SET
+         db_host = EXCLUDED.db_host,
+         db_port = EXCLUDED.db_port,
+         db_name = EXCLUDED.db_name,
+         db_user = EXCLUDED.db_user,
+         db_password = EXCLUDED.db_password,
+         updated_at = NOW()
+       RETURNING *`,
+      [db_host, db_port, db_name, db_user, db_password]
+    );
+    return rows[0];
+  }
+}
+
+module.exports = new DbSettingsService();