create table transfers (
  transferid bigint not null,
  senderid text not null,
  amount numeric not null,
  ref_accountid_receiver bigint not null,
  ref_accountid_sender bigint not null,
  currency text not null
);
comment on table transfers is '
  Transfer is defined by the app specifically to manage users transactions (sending and receiving).
';

comment on column transfers.transferid is '
  Internal unique identifier for this account.
';
comment on column transfers.senderid is '
  The username registered in the application
';
comment on column transfers.amount is '
  The amount to be send. This field allows the process transactions.
';
comment on column transfers.ref_accountid_receiver is '
  The accountid to use to send money and referencing the receiver.
';
comment on column transfers.ref_accountid_sender is '
  The accountid to use to send money and referencing the sender.
';
comment on column transfers.currency is '
  The currency specific to a country.
';