text: create table if not exists clients (
      id bigint auto_increment primary key,
      firstname varchar(100) not null,
      lastname varchar(100) not null,
      passport varchar(50) not null
  );
  
  create table if not exists accounts (
      id bigint auto_increment primary key,
      client bigint not null,
      currency varchar(5) not null,
      balance double,
      iban varchar(50),
      status varchar(20),
      foreign key (client) references clients(id)
  );
  
  create table if not exists transfers (
      id bigint auto_increment primary key,
      amount double,
      receiver bigint not null,
      sender bigint not null,
      created_at timestamp default CURRENT_TIMESTAMP(),
      processed_at timestamp,
      conversion double,
      status varchar(20),
      notes varchar(255),
      foreign key (receiver) references accounts(id),
      foreign key (sender) references accounts(id)
  );