feat: update revolut order data

lnvps_db/migrations/20250313140640_empty_country.sql

@@ -0,0 +1,5 @@
+alter table users
+    change column country_code country_code varchar (3);
+-- assume country_code was not actually set until now
+update users
+set country_code = null;

lnvps_db/src/model.rs

@@ -22,7 +22,7 @@ pub struct User {
     /// If user should be contacted via email for notifications
     pub contact_email: bool,
     /// Users country
-    pub country_code: String,
+    pub country_code: Option<String>,
 }
 
 #[derive(FromRow, Clone, Debug, Default)]

lnvps_db/src/mysql.rs

@@ -441,7 +441,8 @@ impl LNVpsDb for LNVpsDbMysql {
 
         let mut tx = self.db.begin().await?;
 
-        sqlx::query("update vm_payment set is_paid = true where id = ?")
+        sqlx::query("update vm_payment set is_paid = true, external_data = ? where id = ?")
+            .bind(&vm_payment.external_data)
             .bind(&vm_payment.id)
             .execute(&mut *tx)
             .await?;